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Re: outgoing tcp port 25 blocked? how to prove it?

Path csiph.com!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From Winston <wbe@UBEBLOCK.psr.com.invalid>
Newsgroups comp.unix.bsd.freebsd.misc, comp.unix.programmer, comp.misc
Subject Re: outgoing tcp port 25 blocked? how to prove it?
Date Fri, 18 Oct 2024 20:18:36 -0400
Organization A noiseless patient Spider
Lines 23
Message-ID <yded4dhrmr.fsf@UBEblock.psr.com> (permalink)
References <87o73h4if7.fsf@tudado.org>
MIME-Version 1.0
Content-Type text/plain
Injection-Date Sat, 19 Oct 2024 02:18:37 +0200 (CEST)
Injection-Info dont-email.me; posting-host="bfdef503d51b9d540957bb0df1bf0cd3"; logging-data="3713905"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/2oO4n4xjHB5dXYHX176O/"
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Cancel-Lock sha1:wUcOgkiHUj8LmmZ8NxEBC/UmL3Q= sha1:FlPRClwxJ7chY4xEgtrLviQNtZ8=
Mail-Copies-To never
Xref csiph.com comp.unix.bsd.freebsd.misc:4046 comp.unix.programmer:16456 comp.misc:25907

Cross-posted to 3 groups.

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Lesley Esen <lesen@wimezu.com> writes:
> # tcpdump -n port 25
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on ena0, link-type EN10MB (Ethernet), capture size 262144 bytes
> 09:01:45.939473 IP 172.26.5.226.37963 > 69.164.210.174.25: Flags [S], seq 1665376094, win 65535,

172.26.*.* is private, not public, IP address space.  If that's the TCP
source address being sent to the remote hosts, it's not surprising
you're not getting an answer.  If I'm reading your article right, the
public IP address 34.197.192.71.

If you can't solve the problem directly, you may need to relay outbound
mail via some AWS mail forwarder, if they have them.

> The host 69.164.210.174 also runs an SMTP server, but someone seems to
> block my path to it.  It might not AWS as I also can't reach it from my
> personal computer (with a dynamic IP address).

Try "netstat -an4" on 69.164.210.174 to verify that the mail server is
indeed listening on port 25.  Also, if that host is behind a NAT
firewall, you may also need to configure the firewall to enable port
forwarding for port 25.
 -WBE

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Thread

outgoing tcp port 25 blocked? how to prove it? Lesley Esen <lesen@wimezu.com> - 2024-10-18 11:03 -0300
  Re: outgoing tcp port 25 blocked? how to prove it? Winston <wbe@UBEBLOCK.psr.com.invalid> - 2024-10-18 20:18 -0400
    Re: outgoing tcp port 25 blocked? how to prove it? Lesley Esen <lesen@wimezu.com> - 2024-10-19 09:11 -0300
      Re: outgoing tcp port 25 blocked? how to prove it? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-10-19 07:33 -0700
        Re: outgoing tcp port 25 blocked? how to prove it? Lesley Esen <lesen@wimezu.com> - 2024-10-19 13:13 -0300
      Re: outgoing tcp port 25 blocked? how to prove it? John Levine <johnl@taugh.com> - 2024-10-19 18:40 +0000
        Re: outgoing tcp port 25 blocked? how to prove it? Lesley Esen <lesen@wimezu.com> - 2024-10-19 19:13 -0300
      Re: outgoing tcp port 25 blocked? how to prove it? Bob Eager <news0009@eager.cx> - 2024-10-19 19:43 +0000

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