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From: Claus =?iso-8859-1?Q?A=DFmann?= <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org>
Newsgroups: comp.mail.sendmail
Subject: Re: [client] did not issue MAIL/EXPN/VRFY/ETRN during connection
Date: Fri, 26 Apr 2024 16:23:17 -0400 (EDT)
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HQuest wrote:
> I've began to see quite a few "[client] did not issue
> MAIL/EXPN/VRFY/ETRN during connection" messages at my mail log files,
> from origins such as Mailchimp and Microsoft hosted systems. Not certain

Do you get any mail from them or does this always happen?

> define(`confTO_COMMAND', `1m')dnl

Why did you choose this?

> Kcheck_client dns -R a -T T -q

Where/how is this used?

> Apr 26 13:16:01 mxhost sm-mta[126129]: NOQUEUE: connect from
> mx0a-0017d901.pphosted.com [208.84.65.218]

> Apr 26 13:17:01 mxhost sm-mta[126129]: 43QHG1xY126129: timeout waiting
> for input from mx0a-0017d901.pphosted.com during server cmd read

Maybe 1m is too short, esp. if DNS lookups take a while.
The default is much longer - see the docs.

-- 
Note: please read the netiquette before posting. I will almost never
reply to top-postings which include a full copy of the previous
article(s) at the end because it's annoying, shows that the poster
is too lazy to trim his article, and it's wasting the time of all readers.