Re: [cobalt-users] sendmail error message 10051, no socket error

[Andreas Banze <andreas@xxxxxxxx>]

On Tue Oct 14, 2003 - 01:22:16PM, wcstaff wrote:

> What does a sendmail error message 10051, no socket error mean. I have a
> customer that, all of a sudden, cannot send mail. He is the only one.

It does mean that you got something wrong.

10051 is a common error for the Microsoft email applications (no socket
error is also the message that is usually connected with this error) - it is
not a sendmail error per se.

Unless you can't confirm any error in your log file it is very likely an
error on your customers side. Only one problem: It's rather difficult to
predict what the error is.

Ask the customer to open an ms dos prompt window and type "telnet
your.mail.host 25" (make sure to tell him to use _your_ mailserver hostname
instead of your.mail.host).

It should look approx. like that:

220 your.host.name ESMTP Sendmail 8.12.10/8.12.10/Debian-4; Tue, 14 Oct
2003 19:36:57 +0200;

check yourself to see what it should look like (type quit to close the
connection).

If he can identify a line beginning with 220 and including the string
Sendmail and a date/time stamp he should be able to use his mail application
as well - so check the settings with him. If he can't see anything like that
there could be a firewall involved - but it's probably not your fault but his.


MfG
Andreas Banze

--
There are two means of refuge from the miseries of life: music and cats.
					-- Albert Schweitzer