Re: 554 SMTP synchronization error

[Kolbjørn Barmen <kolbjorn.barmen (at) uninett.no>]

On Wed, 17 May 2006, Dominique Frise wrote:

> Hi all,
> 
> Maybe this has been discussed already but I can't find any relevant info.
> All our smtp tests sporadically report similar error:
> 
> ------------
> yellow  Wed May 17 14:37:21 2006 smtp NOT ok
> 
> Service smtp on mailc is not OK : Unexpected service response
> 
> 
> 554 SMTP synchronization error..
> 
> Seconds: 0.00
> ------------
> 
> How can we avoid this?

I made my own SMTP-tester (to test MX for certain domains, not SMTP on
certain hosts) and there I met this problem. My test is as follows

MXTEST=$((sleep 1 ; echo quit) | nc -w 1 ${MXHOST} 25) || MXCOLOR="red"

Without the sleep, some microsoft servers refused to repond 220, and
without the -w 1 for netcat, some exim servers reponded with the above
554. (IIRC, it might have been the other way around)

I dont really understand why the sleep make any difference, but somehow it
does.

-- 
Kolbjørn Barmen
UNINETT Driftsenter