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E-Mail / Re: Postfix Mail Server commands

« on: September 10, 2020, 11:59:49 AM »

i'm having problem on Postfix.
When checking my smtp https://mxtoolbox.com/SuperTool.aspx?action=smtp i'm getting error on rDNS is not a valid hostname.
 
   SMTP Valid Hostname   Reverse DNS is not a valid Hostname    More Info
   SMTP Reverse DNS Mismatch   OK - 173.208.200.30 resolves to baloyiinc.com   
   SMTP Banner Check   OK - Reverse DNS matches SMTP Banner   
   SMTP TLS   OK - Supports TLS.   
   SMTP Connection Time   0.246 seconds - Good on Connection time   
   SMTP Open Relay   OK - Not an open relay.   
   SMTP Transaction Time   0.739 seconds - Good on Transaction Time

when checking postfix status i'm getting the following warning:

WARNING!
● postfix.service - Postfix Mail Transport Agent
   Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2020-09-10 10:34:28 SAST; 3h 7min ago
  Process: 8447 ExecStop=/usr/sbin/postfix stop (code=exited, status=0/SUCCESS)
  Process: 8461 ExecStart=/usr/sbin/postfix start (code=exited, status=0/SUCCESS)
  Process: 8459 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, status=0/SUCCESS)
  Process: 8457 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, status=0/SUCCESS)
 Main PID: 8528 (master)
   CGroup: /system.slice/postfix.service
           ├─ 8528 /usr/libexec/postfix/master -w
           ├─ 8530 qmgr -l -t fifo -u
           ├─ 8541 tlsmgr -l -t unix -u
           ├─10687 proxymap -t unix -u
           ├─10688 anvil -l -t unix -u
           ├─10696 trivial-rewrite -n rewrite -t unix -u
           └─28449 pickup -l -t fifo -u -o content_filter= -o receive_override_options=no_header_body_checks

Sep 10 13:39:44 baloyi.baloyiinc.com postfix/qmgr[8530]: 425228C73: removed
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/smtpd[10743]: connect from unknown[127.0.0.1]
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/smtpd[10743]: 48C518C70: client=unknown[127.0.0.1]
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/cleanup[10704]: 48C518C70: message-id=<017b01d68767$02e32470$08a96d50$@co.za>
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/qmgr[8530]: 48C518C70: from=, size=61453, nrcpt=1 (queue active)
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/smtpd[10743]: disconnect from unknown[127.0.0.1] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/smtp[10914]: E9DF18C67: to=, relay=127.0.0.1[127.0.0.1]:10024, delay=7.4, delays=0.85/0.03/0.01/6.6, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 48C518C70)
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/qmgr[8530]: E9DF18C67: removed
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/pipe[10745]: 48C518C70: to=, relay=dovecot, delay=0.2, delays=0.08/0.01/0/0.11, dsn=2.0.0, status=sent (delivered via dovecot service)
Sep 10 13:39:47 baloyi.baloyiinc.com postfix/qmgr[8530]: 48C518C70: removed

but my hostname is valid you can even browse it at baloyi.baloyiinc.com.

Can you assist me how to fix this why smtp are saying "Reverse DNS is not a valid Hostname".

Thanks
Gabriel