SysteMajik Consulting

Category: Electronic Mail

Posts relating to email servers and services.

  • Email Policy

    SysteMajik.com actively discourages Spam and email sent from incorrectly configured servers. A legitimate email from correctly configured servers should have little problem being delivered. We believe we are relatively compliant with  RFC 2505 – Anti-Spam Recommendations for SMTP MTAs and other RFCs mentioned at the end of this document.

    This article covers our policy implementation for incoming and outgoing email.  These policies apply to all email destined to or originating from systemajik.com,  toucantango.com, and other domains for which we may handle email.

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  • Implementing DKIM with Exim

    This article was updated in February 2014 to reflect changes in policy and reporting options. The earlier ADSP (Author Domain Signing Practices) information has been removed.

    DomainKeys Identified Mail (DKIM) provides a method to confirm the origin of an e-mail. DKIM also provides some protection against tampering. Unlike SPF, this validation applies to the contents of the message when it is signed. Like SPF, the information required for validation is added to DNS.

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  • Signing Return Path Addresses with Exim

    I have been receiving a fair amount of Spam from an e-mail forwarder. They are unwilling to correct their problems. Much of this Spam is in the form of bounce notifications. Attempting to reject other Spam resulted in more notifications. To control this Spam I implemented signed return path addresses. As a side benefit, I am also rejecting bogus notifications sent directly to me.

    Signing my return path allows me to reject faked notification e-mail. The SMTP standard requires that no email sent with a null return path “<>” (aka Envelope Sender) be returned. Its purpose is for allowing for notifications about existing messages. These include notifications such as address unknown, message delivered, and message read. E-mail notifications which are not about a previously sent message can be refused. Signing the return path allowed me to reject such invalid notifications.

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  • Running an Email Server

    I administer an email server for a couple of domains and a few users.  Incorrectly configured email servers result in a lot of my administration work.   Due to improper configuration, far too many servers look like Spam servers.   A little effort in setting up your server can make my life easier, and increase your chance of successfully delivering email everywhere.  This article describes steps you should take. (more…)

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