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I found that SPF record are checked according to From sender's domain. Is this supposed to be used also for Reply-To header or may I put in the Reply-To address what I want?

Tobia
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No, it only checks the envelope sender. It's meant for incoming e-mails, so the receiving mail server might check whether the arriving e-mail message is sent from a server which is listed in the SPF record.

The Reply-To header is for different meanings. It will simply use that address as the one for answers, but it doesn't provide any information about the origin of the e-mail. Thus, only the envelope server is relevant here.

nKn
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  • What is the envelope sender? When it is defined? – Tobia Jan 11 '16 at 15:40
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    You have two sender addresses, `From:` and the envelope sender. The second is where delivery status should be sent, whereas the first one is where 'humans' respond. More on this here: https://www.pobox.com/helpspot/index.php?pg=kb.page&id=260 – nKn Jan 11 '16 at 15:44
  • Nice, but by default is this the same as From? I'm working with a standard Exim server... – Tobia Jan 11 '16 at 15:50
  • Usually they are the same, but they don't have to be (and that's what spammers take advantage of). – nKn Jan 11 '16 at 15:51