Dear support,
I installed the Let's Encrypt certificate via DNS verification, but when I try to send a test message via SMPT with SSL certificate check, port 587, TLS secure, the letter is not sent and does not reach the recipient.
When I disable certificate check, it works.
How can I make it work correctly with certificate verification?
I also constantly see this message in large quantities in the log -
...
Feb 1 10:10:22 mydomain postfix/smtpd[7890]: connect from unknown[195.177.95.185]
Feb 1 10:10:24 mydomain postfix/smtpd[7890]: warning: unknown[195.177.95.185]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Feb 1 10:10:24 mydomain postfix/smtpd[7890]: disconnect from unknown[195.177.95.185] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Feb 1 10:10:27 mydomain postfix/anvil[4779]: statistics: max connection rate 3/60s for (smtp:195.177.95.185) at Feb 1 10:00:41
Feb 1 10:10:27 mydomain postfix/anvil[4779]: statistics: max connection count 1 for (smtp:195.177.95.185) at Feb 1 10:00:39
Feb 1 10:10:27 mydomain postfix/anvil[4779]: statistics: max cache size 2 at Feb 1 10:08:22
Feb 1 10:10:54 mydomain postfix/smtpd[7918]: connect from unknown[195.177.95.185]
Feb 1 10:10:56 mydomain postfix/smtpd[7918]: warning: unknown[195.177.95.185]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Feb 1 10:10:56 mydomain postfix/smtpd[7918]: disconnect from unknown[195.177.95.185] ehlo=1 auth=0/1 quit=1 commands=2/3
Feb 1 10:11:23 mydomain postfix/smtpd[7890]: connect from unknown[195.177.95.185]
Feb 1 10:11:26 mydomain postfix/smtpd[7890]: warning: unknown[195.177.95.185]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Feb 1 10:11:26 mydomain postfix/smtpd[7890]: disconnect from unknown[195.177.95.185] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
Feb 1 10:11:42 mydomain postfix/smtpd[7918]: connect from unknown[195.177.95.185]
Feb 1 10:11:45 mydomain postfix/smtpd[7918]: warning: unknown[195.177.95.185]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Feb 1 10:11:45 mydomain postfix/smtpd[7918]: disconnect from unknown[195.177.95.185] ehlo=1 auth=0/1 rset=1 quit=1 commands=3/4
...
What is the reason for this?
I would be grateful for any help you can provide me.
