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RE: SMTP Invalid Address (501 5.5.4)

From: Steve Holme <>
Date: Wed, 21 May 2014 08:00:27 +0100

On Wed, 21 May 2014, Tom Sparrow wrote:

> > have a few ideas as to what could be happening but would you
> > be able to post a log of the communication between either your
> > app or the curl command line tool and the problematic server
> > (with verbose output turned on CURLOPT_VERBOSE with libcurl
> > or -v with curl) to see what is being sent back >and forth and
> > why the 501 is being returned - It will also make sure I am on
> > the same page as you so to speak?
> Please check the log as follows.

Many thanks.

> Email sending machine has hostname set to "&&&&&".

I confirm whether you are passing the &&&&& into curl on the URL ie.


or is that coming from Curl_gethostname() ?


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Received on 2014-05-21