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NOQUEUE message in mail.log

NOQUEUE message in mail.log

We have an application that runs on the same server as sendmail, but are receiving this message:

Jun 26 08:15:21 vacpp7 sendmail[26766]: NOQUEUE: timeout waiting for input from vacpp7 during server cmd read
Jun 26 08:15:21 vacpp7 sendmail[26766]: NOQUEUE: Null connection from vacpp7 []

Is it because the remote SMTP connection is not actually sending a message?

If I can't be part of the Greatest, I just have to be the Greatest myself!
Kirk Gardner

Re: NOQUEUE message in mail.log

Michael, you have it exactly right.

A null connection represents the lack of a standard smtp command from the client. One of the following commands are expected or a null connection status message occurs.

An example of how to cause this is to telnet port 25 and issue a quit. A null connection will then occur:

# telnet XXXX 25
Connected to XXXX.
Escape character is '^]'.
220 ESMTP Sendmail 8.9.3/8.9.3; Tue, 26 Jun 2001 15:34:15
-0400 (EDT)
221 closing connection
Connection closed by foreign host.

# tail -2 /var/adm/syslog/mail.log
Jun 26 15:31:49 XXXX sendmail[10190]: NOQUEUE: Null connection from XXXX [
Jun 26 15:34:17 XXXX sendmail[10237]: NOQUEUE: Null connection from XXXX [

Kirk Gardner - IA-64 Engineer (HPUX Sys Adm)