I have used this person's blog for a few operating systems. https://blog.andreev.it/?p=1975
Poke around for the correct OS. I only set up dovecot and postfix. Keep it simple. You then need opendkim. I think opendkim checks the incoming mail. There is another procedure to sign your mail. When you think it works, use https://dkimvalidator.com/ Also go to mxtools to verify you haven't created an open relay. Regarding LetsEncrypt, I use the bash script. https://github.com/acmesh-official/acme.sh This saves you Python headaches. Original Message From: michael.schumac...@pamas.de Sent: October 26, 2020 1:09 AM To: rdiezmail-2...@yahoo.de; p...@myzel.net Cc: dovecot@dovecot.org Subject: Re: Looking for a guide to collect all e-mail from the ISP mail server Hello R., Sunday, October 25, 2020, 11:12:48 PM, you wrote: RD> I was hoping that there would be a complete mail server setup RD> guide somewhere for this kind of setup. But I guess I'll have to piece all these RD> information snippets together. There are plenty of guides available. I don't know your mother tongue, but seeing your last name, I assume you may be speaking German. Take a look at these German language guides: https://www.it-management-kirchberger.at/manuals-tutorials/server-centos-7/postfix-mailserver-vimbadmin/postfix-amavisd-new-clamav-spamassassin.html https://www.dokuwiki.tachtler.net/doku.php https://dokuwiki.nausch.org/doku.php/centos:mail_c7:spam_6 I am sure others can provide other language guides as well. best regards --- Michael Schumacher