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Consider an email sent from smtp.eumx.net:

From: "John William" <john.wm@inter7.jp>
Reply-To: john.wm@inter7.jp
To: foobar@yahoo.com
Cc: peter@gmail.com, mary@gmail.com, ...

Note that the header did never mentioned eumx.net at all. Do main-stream spam-filters block this kind of mail, who claim that it is from inter7.jp but sent from eumx.net? If they do, is there any workaround I can do to avoid frequently being filtered? (I don't own the SMTP server) Thanks.

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if you set and SPF record, I think you can pass spam filtering.

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