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Re: rdns resolving not working for IPv4

From Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org>
Newsgroups comp.mail.sendmail
Subject Re: rdns resolving not working for IPv4
Date 2026-04-09 02:42 -0400
Organization MGT Consulting
Message-ID <10r7ho5$uq6$1@news.misty.com> (permalink)
References <10r0cbo$240cu$4@dont-email.me> <10r3jvl$677$1@news.misty.com> <10r67m6$3q5up$1@dont-email.me> <10r67pc$3q5up$2@dont-email.me>

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Which OS defines does your system use?
sendmail -bt -d0.13 </dev/null


    OS Defines: ADDRCONFIG_IS_BROKEN HASFCHOWN HASFCHMOD
                HASGETDTABLESIZE HAS_GETHOSTBYNAME2 HASINITGROUPS HASLSTAT
                HASNICE HASRANDOM HASRRESVPORT HASSETREGID HASSETREUID
                HASSETRLIMIT HASSETSID HASSETVBUF HASURANDOMDEV HASSTRERROR
                HASUNAME HASUNSETENV HASWAITPID IDENTPROTO MILTER_NO_NAGLE
                NEEDSGETIPNODE SFS_VFS USE_DOUBLE_FORK USE_SIGLONGJMP


Can you compile "the real thing" and use that?
Maybe your OS provider applies some patches to sendmail?

What are the other log lines for a connection from
smtp.eternal-september.org
that include relay=
?

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Thread

rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-06 15:27 +0200
  Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-06 12:29 -0400
    Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-06 20:26 +0200
      Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-06 15:18 -0400
        Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-06 16:13 -0400
        Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-07 15:32 +0200
          Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-07 14:55 -0400
            Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-08 20:44 +0200
              Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-08 20:46 +0200
                Re: rdns resolving not working for IPv4 Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2026-04-08 21:23 +0000
                Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-09 19:36 +0200
                Re: rdns resolving not working for IPv4 Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2026-04-09 18:23 +0000
                Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-09 20:30 +0200
                Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-09 02:42 -0400
                Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-09 20:02 +0200
                Re: rdns resolving not working for IPv4 Bjørn Mork <bjorn@mork.no> - 2026-04-09 20:48 +0200
                Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-09 21:16 +0200
                Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-09 15:07 -0400
              Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-09 13:48 -0400
                Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-09 20:15 +0200
                Re: rdns resolving not working for IPv4 Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2026-04-09 14:23 -0400
                Re: rdns resolving not working for IPv4 Marco Moock <mm@dorfdsl.de> - 2026-04-09 20:38 +0200

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