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Hybrid email setup w/ managed server but self-hosted client (halubilo.social)

submitted 2 years ago by [email protected] to c/[email protected]

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I'm planning to migrate my email to a different provider, but they don't give much storage, so I was wondering what people would recommend for this kind of setup: basically I'd like to use the new provider as something like a relay. I'd want them to only store an email or two at a time and have some kind of self hosted solution that just grabs the emails from the provider and stores them after deleting them off the provider so it's never storing my entire email history, and also keeps my sent emails somewhere so that I have a copy of it. Ideally I'd wanna be able to set this up with a mail client like NextCloud's.

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[–] [email protected] 1 points 2 years ago

Found it. Postfix has a feature called ETRN service. https://www.postfix.org/ETRN_README.html

The SMTP ETRN command was designed for sites that have intermittent Internet connectivity. With ETRN, a site can tell the mail server of its provider to "Please deliver all my mail now". The SMTP server searches the queue for mail to the customer, and delivers that mail by connecting to the customer's SMTP server.

From what I know about it you might be able to configure the "cloud" Postfix server to deliver all incoming email into your local / self-hosted Postfix instance using relay_domains http://www.postfix.org/postconf.5.html#relay_domains and http://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall and then setup ETRN to deal with your local server being offline / unavailable.

The following links may also be of interest so your local / self-hosted email server can send email. http://www.postfix.org/STANDARD_CONFIGURATION_README.html#dialup https://linuxhint.com/configuring_postfix_relayhost/ https://www.cyberciti.biz/faq/how-to-configure-postfix-relayhost-smarthost-to-send-email-using-an-external-smptd/