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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.

logwatch on Ubuntu 16

logwatch is a utility that helps you track your system's log files, and it can monitor them on a schedule and email you a daily summary of its findings. Like most security packages, logwatch itself isn't a magic bullet, but it can be a useful component of a secure setup. If nothing else, it can greatly reduce the amount of time you spend troubleshooting problems.

Ubuntu 16 provides a recent version of logwatch:

Ubuntu dpkg Error

If you run a recent vintage of Ubuntu, you may encounter the following dpkg error when you're trying to update or install packages. This is usually caused by Ubuntu simultaneously running another instance of the package manager, often on system startup. Still, it can be annoying when you're trying to update your system.

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