After a server restore POSTFIX no longer works

[drivel2787]

Hello,


I paid for CWP support to fix my postfix and mail server so that I wasn't getting invalid certificates.  They advised all they did was add my server to the /etc/hosts in an entry and rebuild my email server.  After restoring a snapshot due to other reasons (where I didn't mess with postfix at all) I am no longer able to connect to mail servers and send email.  I also had tried what they said they did probably 20 times no joke and this didn't fix the issue which is why I paid for support!  Has anyone ran into this or no SASL authentication mechanisms?  What did you do to fix it?  Any tips?  Appreciate anyone's help!

[studio4host]

if you have lost certificates you will probably need to rebuild all certs from the ssl manager...but you should first check postifx/dovecot conf and what is exactly happening there

[drivel2787]

I have renewed certs, I have rebuild the servers after adding DKIM and SPF.  I modified config where needed.  Now I can't connect on ports 993/995 and 465.  My mail server doesn't detect automatically when using thunderbird or outlook.  I also get the following in my log:

Oct  6 23:26:41 host1 postfix/smtpd[263521]: fatal: no SASL authentication mechanisms
Oct  6 23:29:59 host1 postfix/master[1904]: warning: process /usr/libexec/postfix/smtpd pid 341714 exit status 1
Oct  6 23:29:59 host1 postfix/master[1904]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling
Oct  6 23:31:35 host1 postfix/smtpd[341819]: connect from mail-oi1-f196.google.com[209.85.167.196]


This thing has NOT worked once since I setup CWP multiple times.  I even built it from scratch and it wouldn't work until I paid support and they supposedly did exactly what I did and it "MAGICALLY" worked.  LOL. 

[levat]

Had the same issue yesterday after a migration and a restore to centos 8.

I didnt have dovecot-mysql package somehow installed

[overseer]

It's worth mentioning again: if you are creating a fresh server today, don't use a beta OS like CentOS 8 Stream (even with delayed repos). Instead, start with AlmaLinux 8 (a true enterprise Linux, fit for server duty).