Does sending e-mail in the name of customers increase the risk of being marked as spammer?

Posted by Adrian Grigore on Server Fault See other posts from Server Fault or by Adrian Grigore
Published on 2010-04-13T20:43:40Z Indexed on 2010/04/13 20:53 UTC
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spam

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email

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reverse-dns

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spam-filter

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mx

Hi,

We are developing a SaaS website application that lets users send invoices to their clients. Ideally, these e-mails should appear to be originating from our customers, so the sender e-mail address domain will not match the reverse IP entry for our server. In effect we would be forging their e-mail address, but of course with their consent.

Will that result in a higher probability of being marked as a spammer / their e-mails being marked as spam?

If yes, how bad is the penalty?

And what about people who have an e-mail address originating form an SPF-enabled domain? I guess it should be the majority of the big e-mail providers.

© Server Fault or respective owner

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