Hello,

I have a system with a few local users where some of them are configured
for forwarding all incoming messages to external addresses via the use
of .forward.

One of those users forwards mail to an hotmail.com address.

When mail is delivered to this address this is what happens:

> Oct  2 13:50:40 zed postfix/smtpd[1078]: connect from x.y.z[145.238.xx.xx]
> Oct  2 13:50:40 zed postfix/smtpd[1078]: 5721C60DF: 
> client=x.y.z[145.238.xx.xx], sasl_method=PLAIN, sasl_username=d
> Oct  2 13:50:40 zed postfix/cleanup[1070]: 5721C60DF: 
> message-id=<[email protected]>
> Oct  2 13:50:40 zed postfix/qmgr[23328]: 5721C60DF: from=<[email protected]>, 
> size=614, nrcpt=1 (queue active)
> Oct  2 13:50:40 zed postfix/cleanup[1070]: 6354160E2: 
> message-id=<[email protected]>
> Oct  2 13:50:40 zed postfix/local[1071]: 5721C60DF: to=<[email protected]>, 
> relay=local, delay=0.07, delays=0.07/0/0/0, dsn=2.0.0, status=sent (forwarded 
> as 6354160E2)
> Oct  2 13:50:40 zed postfix/qmgr[23328]: 6354160E2: from=<[email protected]>, 
> size=741, nrcpt=1 (queue active)
> Oct  2 13:50:40 zed postfix/qmgr[23328]: 5721C60DF: removed
> Oct  2 13:50:40 zed postfix/smtpd[1078]: disconnect from x.y.z[145.238.xx.xx]
> Oct  2 13:50:42 zed postfix/smtp[1080]: 6354160E2: to=<[email protected]>, 
> orig_to=<[email protected]>, relay=mx3.hotmail.com[65.55.92.184]:25, delay=1.9, 
> delays=0/0.01/0.32/1.6, dsn=2.0.0, status=sent (250  
> <[email protected]> Queued mail for delivery)
> Oct  2 13:50:42 zed postfix/qmgr[23328]: 6354160E2: removed
> Oct  2 13:50:58 zed postfix/smtpd[1063]: connect from 
> bay004-omc1s27.hotmail.com[65.54.190.38]
> Oct  2 13:50:59 zed postfix/smtpd[1063]: NOQUEUE: reject: RCPT from 
> bay004-omc1s27.hotmail.com[65.54.190.38]: 450 4.1.8 
> <[email protected]>: Sender address rejected: 
> Domain not found; from=<[email protected]> 
> to=<[email protected]> proto=ESMTP helo=<BAY004-OMC1S27.hotmail.com>
> Oct  2 13:50:59 zed postfix/smtpd[1063]: disconnect from 
> bay004-omc1s27.hotmail.com[65.54.190.38]

with minimum editing to prevent disclosing email addresses and clients,
and where the last email rcpt attemt is repeated a few times.

So, it seems that hotmail is trying to send something to the forwarded
address, but in a weird way, which seems to be correctly rejected by my
Postfix server.

Is anyone else observing something similar?
Should I do something about it?

Thanks. Cheers,
Daniele

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