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Re: Problem with SMTP using libcurl

From: Michael Wood <>
Date: Fri, 8 Mar 2013 11:55:41 +0200


On 8 March 2013 09:11, Volker Schmid <> wrote:
> Hello,
>>> Whilst I have thought about extending the supported commands to include
>>> RSET, NOOP and VRFY I have not made a business case for it at the
>>> moment.
>>> As such you have me totally stumped as to what could be sending that
>>> RSET :(
>> Maybe a transparent SMTP proxy or virus scanner in the path?
> This is really strange! The protocol was done with wireshark while our
> application (only using libcurl) is trying to send an email. The customers
> say there is no additional software installed on that machine.
> I'mperplexed...
> Can you give me more tips on things to look for?

My initial reaction was also that there might be some or other
antivirus shutting down the SMTP session. What happens after the

When the customers say there's no additional software installed, did
they think of antivirus? Although the fact that turning on logging
changes this implies that something stranger is going on.

Michael Wood <>
List admin:
Received on 2013-03-08