Fwd: smtp Server configuration problem when confirm read rcpt

[Antonio Straziota]

Hi all,
I get a strange problem in roundcube mail.

If I receive an email with a read receipt, when I send the read rcpt I get
the following:

Send: MAIL FROM:<>
Recv: 250 2.1.0 Ok
Send: RCPT TO:<devgioiatech a gmail.com>
Recv: 250 2.1.5 Ok
Send: DATA
Recv: 451 4.3.5 Server configuration problem
Send: RSET
Recv: 250 2.0.0 Ok
Send: QUIT
Recv: 221 2.0.0 Bye

And the read rcpt is not sent.

If I send an email, composed directly from roundcube, mail is sent.

Any idea?

Thanks,
Antonio.

PS: My environment is kolab 3.0 (dev branch enabled) Debian Wheezy.
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