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Re: postfix not sending mail in the queue

From Sam <sam@email-scan.com>
Newsgroups alt.os.linux.slackware
Subject Re: postfix not sending mail in the queue
Date 2025-12-25 20:34 -0500
Organization A noiseless patient Spider
Message-ID <cone.1766712847.26390.136053.1000@ripper.email-scan.com> (permalink)
References (1 earlier) <69426af3$1@news.ausics.net> <slrn10kjebg.9ct.zsd@x360.localdomain> <6949c24d$1@news.ausics.net> <slrn10kp0c3.3tn.zsd@x360.localdomain> <slrn10krilc.iag.syl@elvira.therockgarden.ca>

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Sylvain Robitaille writes:

> > Dec 16 15:06:17 x360 postfix/smtp[2479]: AA6B21E0B4C: to=<ntg- 
> context@ntg.nl>, relay=none, delay=19, delays=19/0/0/0, dsn=4.4.3,  
> status=deferred (Host or domain name not found. Name service error for  
> name=MY_SMTP_SERVER type=A: Host not found, try again)
> > ------------------
>
> But this is ...
>
> Here's a thought ... It won't help solve the problem but it might
> help identify the cause ...
>
> Perhaps just before and just after running "sendmail -v -q" try running
> "getent hosts MY_SMTP_SERVER" (with the correct hostname, of course)
> and confirm that the system is generally able to resolve the hostname?

Postfix is unlikely to be using glibc to resolve hostnames, but rather it's  
making direct DNS queries, either by doing it itself or using a resolver  
library. The "type=A" part of the syslog message is a honking clue.

In which case, it would be more accurate to reproduce what postfix is doing  
by running dig:

dig MY_SMTP_SERVER a

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Thread

postfix not sending mail in the queue Jim <zsd@jdvb.ca> - 2025-12-16 15:20 -0400
  Re: postfix not sending mail in the queue Rich <rich@example.invalid> - 2025-12-16 23:06 +0000
    Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-22 17:32 -0400
  Re: postfix not sending mail in the queue noel <deletethis@invalid.lan> - 2025-12-17 18:33 +1000
    Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-22 17:34 -0400
      Re: postfix not sending mail in the queue noel <deletethis@invalid.lan> - 2025-12-23 08:12 +1000
        Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-24 20:12 -0400
          Re: postfix not sending mail in the queue Rich <rich@example.invalid> - 2025-12-25 04:25 +0000
            Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-25 11:52 -0400
          Re: postfix not sending mail in the queue Sylvain Robitaille <syl@therockgarden.ca> - 2025-12-25 23:37 +0000
            Re: postfix not sending mail in the queue Sam <sam@email-scan.com> - 2025-12-25 20:34 -0500
              Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-27 13:11 -0400
                Re: postfix not sending mail in the queue Sam <sam@email-scan.com> - 2025-12-28 07:57 -0500
                Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-29 20:32 -0400
                Re: postfix not sending mail in the queue Sam <sam@email-scan.com> - 2025-12-31 08:17 -0500
                Re: postfix not sending mail in the queue jayjwa <jayjwa@atr2.ath.cx.invalid> - 2025-12-31 13:03 -0500
                Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-31 16:14 -0400
                Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-31 16:36 -0400
                Re: postfix not sending mail in the queue noel <deletethis@invalid.lan> - 2026-01-01 23:00 +1000
                Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2026-01-02 12:05 -0400
                Re: postfix not sending mail in the queue Sam <sam@email-scan.com> - 2026-01-02 19:37 -0500
                Re: postfix not sending mail in the queue Rich <rich@example.invalid> - 2026-01-01 15:46 +0000
                Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2026-01-02 17:35 -0400
            Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-27 13:04 -0400
          Re: postfix not sending mail in the queue noel <deletethis@invalid.lan> - 2025-12-26 12:13 +1000
            Re: postfix not sending mail in the queue Jim <zsd@jdvb.ca> - 2025-12-27 13:17 -0400
              Re: postfix not sending mail in the queue Rich <rich@example.invalid> - 2025-12-28 05:19 +0000
                Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-28 23:10 -0400
                Re: postfix not sending mail in the queue Rich <rich@example.invalid> - 2025-12-29 18:06 +0000
                Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-29 20:34 -0400
                Re: postfix not sending mail in the queue noel <deletethis@invalid.lan> - 2025-12-30 10:53 +1000
  Re: postfix not sending mail in the queue jayjwa <jayjwa@atr2.ath.cx.invalid> - 2025-12-17 11:22 -0500
    Re: postfix not sending mail in the queue noel <deletethis@invalid.lan> - 2025-12-18 14:11 +1000
      Re: postfix not sending mail in the queue Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2025-12-18 06:32 +0000
        Re: postfix not sending mail in the queue Marco Moock <mm@dorfdsl.de> - 2025-12-18 16:32 +0100
          Re: postfix not sending mail in the queue Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2025-12-19 18:46 +0000
        Re: postfix not sending mail in the queue noel <deletethis@invalid.lan> - 2025-12-19 12:29 +1000
    Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-22 17:42 -0400
      Re: postfix not sending mail in the queue Sylvain Robitaille <syl@therockgarden.ca> - 2025-12-24 22:34 +0000
        Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-24 20:14 -0400
  Re: postfix not sending mail in the queue Joseph Rosevear <Mail@JoesLife.org> - 2025-12-19 07:54 +0000
    Re: postfix not sending mail in the queue Jim Diamond <zsd@jdvb.ca> - 2025-12-22 18:03 -0400

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