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?
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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.
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