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MamoliSpaFlag for Italy

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Error in sending an email: Blank return-path

Hi everybody,
I cannot send an email to a recipient, because my Lotus Domino returns this error:

Error transferring to mgw2.interway.CH; SMTP Protocol Returned a Permanent Error 550 <silva@mamoli.com>: Sender address rejected: undeliverable address: host mail.mamoli.com[80.204.83.211] said: 550 Blank return-path has been disabled on this server (in r (There was a transient connection failure between the servers, for example a network problem.)

What can i do to solve the problem?
Regards
Nicola
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mssturgeon

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Is it with only single mail address, or to all the mails going outside?
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ASKER

Thanks for the 1st answer... I could image what you said.... but how can i make the return-path header not blank?
Regards
Nicola
The problem exists only for the "svgw.ch" domain. Otherwise we have no problem in sending/receiving emails (sometimes we had black-list problems, but it's different from this case).
Nicola
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mssturgeon

From the error, it appears that the the server is rejecting the sender's domain: mamoli.com

Furthermore, this rejection is from interway.CH, not svgw.ch ... although I do not doubt that the latter may be your ultimate destination. sounds like the ISP (interway.CH) may be blocking you.
As far as the return path header being blank ... if that is, in fact, due to the NDR, then there's nothing you can do as NDR's are system-generated and always sent with blank return path's.