It should go without saying that the security of your mailing infrastructure (e-mail server) is closely tied to your sender’s reputation and is a building block for establishing long-lasting relationships with your customers.

 E-Mail Server

If you hack and spam land in your customers’ inboxes, there are several risks, each of which has a different impact on your email program:


  • Spam creates a lot of complaints against your domain and IP address.
  • Spam will cause a decline in customer engagement with your legitimate email
  • Both the customer and the mailbox provider (MBP) can block your mail
  • Spam will be sent to random email addresses to malicious actors who are not your customers, which usually include a high number of spam traps
  • If unauthorized content is being sent from your infrastructure and you are killing spam traps, you are likely to be listed on the publicly available list

The various factors I mentioned above. Because key MBP performance and security parameters are checked. Making filtering decisions before accepting a connection to your email server.

The time it takes to normalize performance metrics varies depending on the scale of spam metrics, but no matter how long it takes, it will have a detrimental effect on email delivery and ROI.

Based on our experience with certified customers, we have made 5 suggestions to secure your e-mail server. Share this information with your IT department for better protection from malicious actors:


  1. Encryption: When securing your mail server, make sure that you are using a secure connection. Encrypt POP3 and IMAP authentication and use SSL and TLS.
  2. Mail relay configuration: Avoid having an open relay for spammers by specifying which domain / IP address your mail server will relay mail to.
  3. Connection and Default Settings: To avoid DoS attacks, limit the number of connection and authentication errors your system accepts. Remove unnecessary server functionality by disabling any unnecessary default settings. Keep a dedicated mail server and transfer other services such as FTP to another server. Limit total, simultaneous, and maximum connections to your SMTP server.
  4. Access Control: To protect your server from unauthorized access, implement authentication and access control. For example, SMTP authentication requires users to supply usernames and passwords. Being able to send mail to the server.
  5. Abuse prevention: Check DNS-based blacklists (DNSBLs) and reject email from any domain or IP listed on them. Check the Spam URI Realtime Blocklist (SURBL), and reject any messages with invalid or malicious links. In addition, maintain a local blacklist and block any IP addresses specifically targeting you. Employ outbound filtering and use captcha / reCAPTCHA with your web form. More about this source textSource text required for additional translation information.

Maintaining your mail server security is not only a prerequisite for a successful email program. But also to get the most out of the certification program. The benefits therefore include major MBP, significant MBP filters, unblocked images and improved email delivery over active links. If the compliance team detects spam on your certified IP address / domain. They suspend your IP address / domain from the authentication program. It may take 30 days or more for a performance metric to comply with the certification threshold.

For more related information check it out migomail and telcob

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