I use my own Private SSL. But my e-mail server is disabled after a while, the mails do not enter. I looked at the solutions in the forum and did not solve the problem. When I deactivate the SSL certificate and activate it again, my mail server rings. But after a certain period of time it breaks down by itself.

un 22 11:52:11 mail dovecot: imap-login: Login: user=<auto@umtcar.be>, method=PLAIN, rip=::1, lip=::1, mpid=2284, secured, session=<6SGKgHcbxugAAAAAAAAAAAAAAAAAAAAB> Jun 22 11:52:11 mail dovecot: imap(auto@umtcar.be)<2284><6SGKgHcbxugAAAAAAAAAAAAAAAAAAAAB>: Logged out in=142 out=1026 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0 Jun 22 11:52:38 mail postfix/smtpd[2310]: warning: error opening chain file: /etc/ssl/private/ssl-cert-snakeoil.key: No such file or directory Jun 22 11:52:38 mail postfix/smtpd[2310]: connect from localhost[::1] Jun 22 11:52:38 mail postfix/smtpd[2310]: C6A823B12F0: client=localhost[::1], sasl_method=PLAIN, sasl_username=auto@umtcar.be Jun 22 11:52:38 mail postfix/cleanup[2314]: C6A823B12F0: message-id=<20240622095238.C6A823B12F0@mail.umtcar.be> Jun 22 11:52:39 mail postfix/qmgr[1549]: C6A823B12F0: from=<auto@umtcar.be>, size=844, nrcpt=1 (queue active) Jun 22 11:52:39 mail postfix/smtpd[2310]: disconnect from localhost[::1] ehlo=1 auth=1 mail=1 rcpt=1 data=1 commands=5 Jun 22 11:52:39 mail postfix/smtp[2316]: C6A823B12F0: to=<esclikes@gmail.com>, relay=gmail-smtp-in.l.google.com[2a00:1450:4025:402::1a]:25, delay=0.96, delays=0.33/0.02/0.27/0.34, dsn=5.7.25, status=bounced (host gmail-smtp-in.l.google.com[2a00:1450:4025:402::1a] said: 550-5.7.25 [2a02:c206:2192:8590::1] The IP address sending this message does not 550-5.7.25 have a PTR record setup, or the corresponding forward DNS entry does 550-5.7.25 not match the sending IP. As a policy, Gmail does not accept 550-5.7.25 messages from IPs with missing PTR records. For more information, go 550-5.7.25 to 550-5.7.25 https://support.google.com/a?p=sender-guidelines-ip 550-5.7.25 To learn more about Gmail requirements for bulk senders, visit 550 5.7.25 https://support.google.com/a?p=sender-guidelines. 4fb4d7f45d1cf-57d30b0c08fsi1659378a12.648 - gsmtp (in reply to end of DATA command)) Jun 22 11:52:39 mail postfix/cleanup[2314]: BB3F73B12FA: message-id=<20240622095239.BB3F73B12FA@mail.umtcar.be> Jun 22 11:52:39 mail postfix/bounce[2318]: C6A823B12F0: sender non-delivery notification: BB3F73B12FA Jun 22 11:52:39 mail postfix/qmgr[1549]: BB3F73B12FA: from=<>, size=4484, nrcpt=1 (queue active) Jun 22 11:52:39 mail postfix/qmgr[1549]: C6A823B12F0: removed Jun 22 11:52:39 mail dovecot: lmtp(2320): Connect from local Jun 22 11:52:39 mail dovecot: lmtp(auto@umtcar.be)<2320><jWNvL+eedmYQCQAAY2hGbA>: sieve: msgid=<20240622095239.BB3F73B12FA@mail.umtcar.be>: stored mail into mailbox 'INBOX' Jun 22 11:52:39 mail postfix/lmtp[2319]: BB3F73B12FA: to=<auto@umtcar.be>, relay=mail.umtcar.be[private/dovecot-lmtp], delay=0.04, delays=0/0.01/0.01/0.01, dsn=2.0.0, status=sent (250 2.0.0 <auto@umtcar.be> jWNvL+eedmYQCQAAY2hGbA Saved) Jun 22 11:52:39 mail dovecot: lmtp(2320): Disconnect from local: Client has quit the connection (state=READY) Jun 22 11:52:39 mail postfix/qmgr[1549]: BB3F73B12FA: removed Jun 22 11:52:45 mail dovecot: imap-login: Login: user=<auto@umtcar.be>, method=PLAIN, rip=::1, lip=::1, mpid=2334, secured, session=<Q5OIgncbNuoAAAAAAAAAAAAAAAAAAAAB> Jun 22 11:52:45 mail dovecot: imap(auto@umtcar.be)<2334><Q5OIgncbNuoAAAAAAAAAAAAAAAAAAAAB>: Logged out in=300 out=3967 deleted=0 expunged=0 trashed=0 hdr_count=6 hdr_bytes=1551 body_count=0 body_bytes=0 Jun 22 11:52:46 mail dovecot: imap-login: Login: user=<auto@umtcar.be>, method=PLAIN, rip=::1, lip=::1, mpid=2336, secured, session=<A/yggncbQuoAAAAAAAAAAAAAAAAAAAAB> Jun 22 11:52:46 mail dovecot: imap(auto@umtcar.be)<2336><A/yggncbQuoAAAAAAAAAAAAAAAAAAAAB>: Logged out in=622 out=6674 deleted=0 expunged=0 trashed=0 hdr_count=1 hdr_bytes=393 body_count=5 body_bytes=3606

No path in the folders below on my server