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OpenSMTPD is ridiculously pleasant to configure, without sacrificing features like "I don't want my password in the configuration file".

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Looks very simple, but I don't see things like DKIM/SPF or milters (or some equivalent way to hook in spamassassin, for instance). Am I just missing it, or is it deliberately missing those features?

currently, the only way to achieve this is through a dkim-proxy or an experimental filter in OpenSMTPD-extras.

we have recently finished an API for implementing filters and we're working on stabilizing the interface before making it public.

This can be done by relaying to dkimproxy, and have it relay back on a differet port, tagging the returned (signed) message. Check the list archives for examples.

If you need a simple drop-in sendmail clone for relaying email through Gmail or countless email service providers, don't forget msmtp -- couldn't be easier. Just one file to configure and nothing extra you don't need. Optionally, installing msmtp-mta creates a sendmail alias to msmtp or just ln it yourself. Examples at: https://wiki.archlinux.org/index.php/msmtp (pretty much the same on Ubuntu, etc.)

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