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A wide range of anti-spam strategies has been applied to stop email spam. There is no perfect answer for spam. There are trade-offs between incorrect rejection of legitimate emails ( false negatives ) and the associated costs of removing the emails from incoming mail. The techniques used to stop phishing can be divided into four broad categories.

Manage errors in spam filtering

Spam may be filtered on misconfigured servers, by ISP'ISP'st block specific mail servers, or by mail policies of hosts. To stop this kind of false-negative, the email system administrator needs to correct these errors and re-train his spam filters. For example, suppose a sender is blocked because its IP address was incorrectly detected as a source of spam. In that case, it is sufficient to check via email with the affected party whether he sent an email, and if this is not true, inform the service provider about the incoming error. False-positive (legitimate mail marked as spam) can also be corrected by correcting any filter configuration or checking incoming emails automatically against a legitimate list and then sending them back to the postmaster, where they were automatically discarded previously for security reasons.

Do you want to stop spam?

Geolance is a leading provider of anti-spam solutions. We'vWe'veeloped a compelling suite of anti-spam tools that will help you keep your inbox free from unwanted messages. Our products are designed to be easy to use and provide the best protection against email threats on the market today.

With our webmail interface, you can easily manage all your email accounts in one place, which also includes powerful filtering options for keeping spam out of your mailbox. Furthermore, with our high level of customer support, we ensure that every user gets exactly what they need from their anti-spam solution – whether a simple safelist or something more complex like custom rulesets explicitly tailored for their needs. And if you ever have any questions about how things work, get in touch! We'rWe'reays happy to help out and answer any queries you might have about our services.

Classification-based spam filters

Classification-based spam filters analyze the content of an email and attempt to identify characteristics that are common to spam messages. Unfortunately, this type of filter is often inaccurate due to the ever-changing nature of spam and can cause legitimate messages to be blocked. Classification-based filters can be enhanced through user feedback, but this is not a perfect solution because many users do not report false positives.

Blacklist-based spam filters

Blacklist-based spam filters rely on lists of known spammers or IP addresses from which spam is known to originate. These filters are pretty accurate, but they can block legitimate mail if the sender's address is mistakenly included on a blacklist. User feedback can reduce false positives, but this is not a perfect solution because some users do not report false positives. The overhead addition, checking for one email at a time can cause legitimate emails to be delayed.

Whitelist-based spam filters

A whitelist-based spam filter uses lists of IP addresses from which it knows only legitimate email will originate. Messages from other IP addresses are almost always blocked if they cannot be authenticated as having been sent by an authorized person or system on behalf of the organization that the domain represents. Whitelisting is most effective when anti-spam systems also rely on authentication technologies such as SPF, DKIM, and DMARC to identify legitimate messages.

This type of filtering works well if the sender is approved on the whitelist, but it will be rejected if the sender is not whitelisted. This type of filtering can also block legitimate mail if authorized senders are not added to the whitelist. False positives are also possible if spammers pass themselves as being from a trusted source or server.

Whitelisting-based filters can authenticate that an authorized person has sent the email on behalf of the domain they represent and only accept messages from these IP addresses. Whitelist-based spam filtering is typically combined with other types of spam filtering techniques.

The first stage in anti-spam processing usually checks for spam signatures using pattern matching techniques similar to those used in virus scanners. The most common approach is to use a Bloom filter for this stage. The filters are often combined with other techniques such as greylisting, blacklisting, and whitelisting.

Greylisting-based spam filtering

The MTA receives a temporary failure (a 4xx code) when it first tries to deliver mail from a new client in greylisting. However, if the client attempts to send the same message again, or any other clients try to send through that server, delivery succeeds without delay. This technique can reduce spam because spammers typically don't try sending an email once they receive 4xx codes in response, and non-spam email is rarely sent in batches. Greylisting works best when combined with authentication techniques such as SPF and DKIM.

Anti-spam techniques may be implemented in some places within the email delivery process:

Sender Policy Framework (SPF) and Sender ID

SPF uses DNS records to list IP addresses from which it is legitimate to send emails for particular domains. The benefits of SPF include reduced spam because spammers will not pass emails through servers that are not authorized to send on behalf of that domain and improved reputation by associating good IP addresses with the domain name, making them less likely to be blocked in the future. It can also reduce phishing attacks by checking that SMTP commands such as VRFY and EXPN come from trusted sources before compliance with RFC 7489 is required. Unfortunately, many mail server administrators ignore these recommendations, but this changes as SPF becomes more widely used.

Sender ID is an extension of SPF that uses the reverse DNS lookup to determine the legitimacy of email senders. Sender ID checks the IP address of the envelope sender, which is usually not the same as the from an address in the email header.

DomainKeys Identified Mail (DKIM)

DKIM verifies that an authorized person has sent an email on behalf of the domain they represent and only accepts messages from these IP addresses. DKIM works by attaching a digital signature to each message using a private key. The recipient's server can then use the public key published in the DNS to verify the message was signed by an authorized domain user. This approach is designed to prevent spammers from signing messages with a domain to pass anti-spam tests and ensure they will be delivered to the mailbox.

Domain-based Message Authentication, Reporting & Conformance (DMARC)

DMARC allows the sender to indicate that their emails should be protected against fraudulent use of DKIM and SPF records, in addition to providing a report on email authentication and authorization failures. DMARC allows senders (or anyone authorized by them) to publish policies that tell receiving mail servers what they need to do when an email fails authentication checks. The benefits of DMARC include reduced spam. Spammers won't send emails through servers not authorized to send on behalf of that domain, improved reputation by associating good IP addresses with the domain name, and less phishing because it can detect spoofed email messages.

Several web application firewalls (WAFs) can be used to protect against spam. A WAF is a device or software application that monitors and filters all inbound and outbound traffic to web applications. WAFs can be used to protect against a wide variety of attacks, including Cross-Site Scripting (XSS), SQL injection, and request forgery (CSRF).

Some of the most popular WAFs include:

1. ModSecurity

2. OWASP ZAP

3. Burp Suite Pro

4. Netsparker Web Application Security Scanner

5. Acunetix WVS

6. Arachni

7. ParosPro

8. AppShield

9. ASSP - OWASP Anti-Spam Project

10. Mailscanner - Open Source Email Protection System

11. Mod-security for Apache web server running on Windows or Linux

12. Imperva SecureSphere WAF - Enterprise Edition for Microsoft IIS 7, 8 & 10 on Windows Server 2008, 2012 & 2016

13. Barracuda Web Application Firewall (WAF) provides pre-defined security profiles to protect against the most common vulnerabilities and threats to your web applications, including SQL injection, cross-site scripting (XSS), and request forgery (CSRF).

Each of these WAFs has its features and benefits, so it is essential to choose one that meets your organization's specific needs.

Choosing a WAF is an important decision and should not be taken lightly. It is essential to evaluate your organization's needs and select a WAF that provides the best protection against spam and other web application attacks.

Anti-spam technologies in EOP

designed so customers can detect, classify, and take corrective actions against spam email before it reaches their network. However, they are not intended to provide complete anti-spam protection for customers that send mail directly to the internet without using Office 365 as their mail service provider. For this scenario, we recommend that customers use a third-party spam filtering solution such as Forefront Online Protection for Exchange (FOPE), Barracuda Spam Firewall, etc.

Block new types of malware with collective threat intelligence

Office 365 Advanced Threat Protection uses the collective intelligence from Office 365 to deliver protection at machine speed. In addition, you can take action on detected messages by adding them to a block list or reporting them for review. Some spam techniques abuse the cloud to avoid detection and cause latency in email delivery. Office 365 protects against these types of spam attacks through high-speed algorithms that process millions of messages per hour, protecting you from these malicious messages before they reach your network.

New service blocks business email compromise (BEC) scams

As part of our commitment to protect our customers from cybercrime, we're launching a further Business Email Compromise (BEC) service later this year* that will help protect customers from one of the fastest-growing email scams in the world.

The BEC service will use machine learning to identify malicious emails sent to customers to compromise their business accounts and steal money or sensitive information. Then, the service will block these messages before they reach the customer's mailbox, helping to protect them from this type of attack.

Office 365 provides several features that can protect against spam and other web application attacks. These features include DMARC, WAFs, and Advanced Threat Protection. Each of these features has its benefits and should be evaluated to see which one best meets your organization's needs.

Maximize customer productivity with convenient web-based continuity services  

Skype for Business allows users to communicate with anyone across the globe through instant messaging, voice calls, and video calls. In addition, Skype supports group or one-on-one conversations in real-time. This application is designed to help increase productivity by allowing its users to conduct business more effectively.

Microsoft 365 provides tools that allow organizations to keep up with growing demands while staying productive at the same time. Whether your organization seeks improved integration between productivity features, data management solutions, security measures, or cloud technology services, Microsoft 365 has something available to meet your needs. 

Reduce IT costs via automation

The purpose of DevOps is to automate developing applications so that teams can work together using agile processes without sacrificing the need to control changes. This collaboration allows developers to have direct input on the final product to correct issues without compromising time or quality.

The Cloud Security Fabric brings prevention and detection capabilities across Office 365 and Windows Server 2016 into a single, easy-to-manage fabric. It gives you visibility and control under one pane of glass for both cloud and hybrid infrastructures.

Orchestrate security across your organization with Microsoft Threat Protection. The Microsoft Threat Protection solution helps organizations implement an automated, comprehensive approach that proactively detects, analyzes, and mitigates threats as soon as they emerge in real-time.

Cybercrime is on the rise, and businesses need to be aware of the different types of attacks that are taking place to protect themselves. This article will discuss the various features that Office 365 provides to help protect against spam and other web application attacks. We will also discuss how Skype for Business can increase productivity and how Microsoft 365 can be used to reduce IT costs. Finally, we will briefly overview the Microsoft Threat Protection solution.

Office 365 provides several features to help protect against spam and other web application attacks. For example, organizations can enable DMARC (Domain-based Message Authentication, Reporting & Conformance). DMARC uses authentication protocols like DKIM (DomainKeys Identified Mail) or SPF (Sender Policy Framework) used by many email systems to prevent spoofing by verifying that incoming mail is coming from where it claims to be coming from. This allows for easy reporting on unsolicited messages, which will enable clients to defend themselves against future phishing attempts better. Another feature available in Office 365 is WAFs (Web Application Firewalls). WAFs block threats such as SQL injection, cross-site scripting, and brute force attacks.

Anti-spam legislation

The CAN-SPAM Act in the United States has been put into place to help protect consumers from unsolicited emails. However, these laws only apply to commercial email and do not protect against other types of attacks such as phishing or pharming. Office 365 offers several features that can protect organizations from these types of attacks. For example, Exchange Online Protection (EOP) uses a variety of filters, including Bayesian filtering, sender reputation analysis, and content filtering, to help identify and block spam messages. EOP also includes Safe Links, which scans links in emails for malicious code and blocks them before they are opened.

Another feature offered by Office 365 is the Cloud Security Fabric. The Cloud Security Fabric brings prevention and detection capabilities across Office 365 and Windows Server 2016 into a single, easy-to-manage fabric. It gives you visibility and control under one pane of glass for both cloud and hybrid infrastructures. In addition, the Cloud Security Fabric can help protect against threats such as ransomware, malware, and data loss.

The solution includes the following components:

- Microsoft Advanced Threat Analytics (ATA)

- Microsoft Operations Management Suite (OMS)

- Microsoft Exchange Online Protection (EOP)

- Microsoft Azure ATP

- Microsoft Intune

Microsoft Advanced Threat Analytics (ATA) is a service that helps identify advanced threats, including insider attacks and compromised identities. ATA uses machine learning and behavioural analytics to identify malicious activity.

Microsoft Operations Management Suite (OMS) is a cloud-based solution that helps organizations manage and protect their data, applications, and infrastructure. OMS includes log management, backup and recovery, security and compliance, and cost optimization.

Microsoft Exchange Online Protection (EOP) is a cloud-based email filtering service that helps protect organizations from spam and other email threats. EOP uses a variety of filters, including Bayesian filtering, sender reputation analysis, and content filtering, to help identify and block spam messages.

Microsoft Azure ATP is a cloud-based service that helps organizations detect malicious activities. Azure ATP uses machine learning and behavioural analytics to identify malicious activities.

Microsoft Intune is a cloud-based service that helps organizations manage their devices. Intune can manage devices running Windows 10, iOS, Android, and macOS.

Automated techniques for email administrators

Integrate with cloud services, such as MicrMicrosoft'sud App Security, allow for real-time detection of threats your organization is experiencing.

It is important to note that you must subscribe to the relevant service to use the features described above. It should also be noted that these are not the only features available to protect against spam and phishing attacks. These issues include identity theft, phishing, and the spread of malicious software, such as viruses, worms, and trojans (malware). Organizations can also access security information and event management (SIEM) solutions, which provide tools that help organizations discover, diagnose, investigate, respond to, and mitigate threats across their networks.

End-user techniques for email administrators

Train users to recognize and avoid phishing emails. For example, users should not visit websites or follow links in suspect messages that arrive either as an attachment or embedded in the body of a message. Increasingly, anti-spam efforts have led to coordination between law enforcement, researchers, major consumer financial service companies, and Internet service providers to monitor and track email spam, identity theft, and phishing activities and gather evidence for criminal cases.

Report them immediately if you receive suspicious messages and do not open attachments. Once reported, messages can be deleted from the server. If it is necessary to view attachments, scan them with antivirus software before opening them.

Organizations can use web application firewalls (WAFs) to detect spam and other attacks such as SQL injection, cross-site scripting (XSS), command injection, and buffer overflows. WAFs protect against various threats regardless of their nature – network layer DDoS attacks, application-layer attacks, and even those that exploit implementation flaws. Spammers can break through this defence with the help of smart technologies. They use software that generates different content (text, graphics, etc.) in a spam message.

WAFs can be deployed in front of web servers, application servers, or both. They work by inspecting all traffic (inbound and outbound) to and from web applications and blocking malicious requests. WAFs can also be used to detect and block abnormal behaviour, such as a sudden increase in the number of requests from a single IP address.

The most common type of WAF is an appliance-based solution between the organization's internet-facing infrastructure and its internal network. There are also cloud-based WAF solutions available.

WAFs are not a silver bullet – they cannot prevent all attacks, but they can help organizations improve their security against many different types of threats. For example, SQL injection attacks cannot be controlled by a WAF because they occur at the application layer; however, if an attacker sends many requests to execute arbitrary queries on a vulnerable web application, these can be detected and blocked by a WAF.

End-user techniques for security awareness

Regularly advise users about the latest social engineering tactics attackers use so that employees know what to look out for and how to report phishing emails. The information can be disseminated via email or other channels such as the company intranet or training workshops.

Many organizations guide what constitutes suspicious activity – examples include unusually high traffic from external IP or unauthorized changes made to critical systems. This information should be made available to all employees, and it is also a good idea to provide examples of real messages that have been sent in the past.

Don'Don'tn attachments from unknown senders, and don't allow links in messages from unknown sources. Contact the sender before opening the message if an attachment or link looks suspicious.

Notify your organization's security team immediately if you receive suspicious messages such as those described above (e.g., unsolicited messages with unrecognized senders). It may seem overkill, but there is no reason not to report these messages because they could still pose a threat even if they are determined to be harmless in the future: again, better safe than sorry.

Be aware of the latest social engineering tactics used by attackers so that you can identify potential phishing emails. Familiarize yourself with examples of what suspicious activity looks like (e.g., high traffic from external IP addresses, unauthorized changes to critical systems).

Keep your software up-to-date, especially your antivirus software. This will help protect your computer against known malware threats.

WAFs are often combined with other security components such as antivirus software, intrusion prevention systems (IPS), malware analysis solutions, behavioural analysis anti-spam/anti-malware services.

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