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
MamoliSpaAsked:
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mssturgeonCommented:
It sounds like the destination machine has some anti-Spam controls in place that are blocking your email address:

Error 550 <silva@mamoli.com>: Sender address rejected

Can you verify this?

The "Blank return-path" error might be due to the NDR (Non-Delivery Report).  those are always sent with blank return-path headers, which "compliant" SMTP servers are supposed to accept ... but some environments have them disabled nontheless because it is a technique often exploited by spammers.

I know that doesn't necessarily solve your problem, but I hope it helps.
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madheeswarCommented:
Is it with only single mail address, or to all the mails going outside?
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MamoliSpaAuthor Commented:
Thanks for the 1st answer... I could image what you said.... but how can i make the return-path header not blank?
Regards
Nicola
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MamoliSpaAuthor Commented:
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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mssturgeonCommented:
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.
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mssturgeonCommented:
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.
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