Looks like the remote server is starting the smtp connection out of order:

503_MAIL_first

Maybe it starts with a "rcpt to" for some reason. Seeing its a Microsoft node:

* Outlook client without authentication?
* Is it always the same server failing?
* only one sender affected by this?

Rather strange indeed - maybe something trivial as packet loss?

Cheers,
Sebastian

On 29.03.2013, at 18:35, Eric Shubert <e...@shubes.net> wrote:

> On 03/29/2013 10:26 AM, Aleksander Podsiadły wrote:
>> Dnia 2013-03-29, pią o godzinie 17:38 +0530, Amit pisze:
>>> reason: 503_MAIL_first_(#5.5.1)
>> 
>> IMHO it's the greylist, try again.
> 
> You can try again, but I don't think that's it. DENIED_OTHER is a rejection 
> outside the scope of spamdyke, which is what does graylisting. If it were 
> graylisting, you'd see DENIED_GRAYLISTED in the log.
> 
> -- 
> -Eric 'shubes'
> 
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