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SPF, DKIM, and DMARC with Postfix and Ubuntu 20.04

SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting and Conformance) are email authentication protocols that are becoming increasingly necessary to run a working email server. Even if you have valid MX, A, and PTR DNS records for your mail server, you may find that your emails are getting rejected as spam by major providers like Gmail and Outlook.com. Implementing SPF, DKIM, and DMARC will allow your messages to get through.

Ubuntu Email Server with Postfix, Dovecot, and MySQL

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Update November 2020: If you're on Ubuntu 20.04, these instructions still mostly work as written. There is one update of note, though, related to Dovecot and SSL. This is indicated below for Dovecot's 10-ssl.conf file.
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Update November 2016: If you're on Ubuntu 16.04, these instructions will mostly work as written. However, there are a few minor changes that you might want to review before you get started.
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