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Re:YouTube suspends Google accounts of Markiplier's viewers ... by ryandrake on Saturday November 09, 2019 @10:54AM (#21492198)
Linode's documentation tends to be pretty good: https://www.linode.com/docs/email/postfix/configure-spf-and-...

That guide assumes you're using postfix as your MTA. For exim, their documentation can be found here: https://www.exim.org/exim-html-current/doc/html/spec_html/ch...

Distributions often have their own documentation, for Debian: https://debian-administration.org/article/718/DKIM-signing_o... and https://debian-administration.org/article/719/Avoiding_mail-...

Keep in mind this is all to increase deliverability of your outgoing mail. You may also optionally want to check SPF and DKIM on incoming mail to cut down on spam: https://debian-administration.org/article/721/Validating_SPF...

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