Hello! I installed aaPanel, everything is fine, configured Mail Server, everything works fine. Only when sending a message through a PHP script, it gives the following error:
Postfix SMTP server: errors from unknown[xxx.xxx.xxx.xxx]
Transcript of session follows.
Out: 220 my_domain.com ESMTP Postfix (Ubuntu)
In: EHLO [192.168.0.103]
Out: 250-my_domain.com
Out: 250-PIPELINING
Out: 250-SIZE 102400000
Out: 250-VRFY
Out: 250-ETRN
Out: 250-STARTTLS
Out: 250-AUTH PLAIN LOGIN
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250-DSN
Out: 250-SMTPUTF8
Out: 250 CHUNKING
In: STARTTLS
Out: 454 4.7.0 TLS not available due to local problem
In: QUIT
Out: 221 2.0.0 Bye
How to fix this problem?