Example:
Let's say that I work for a hypothetical ACME Widgets, Inc. My e-mail address is [EMAIL PROTECTED] A potential customer, [EMAIL PROTECTED], tries to send me an e-mail message from his laptop using a public access point in his hotel. The network he's on is not listed as an allowed relay for example.com, according to their SPF record. My administrator (at acmewidgets.com) is honoring SPF records. What happens?
That's just it - if your sales guy is at hotel with his laptop, he could use AUTH/STARTTLS and actually relay through his company's mail server. Thus the email from [EMAIL PROTECTED] would be delivered by mail.acmewidgets.com to where it needed to go... SPF would be valid. This no bounce at the destination.
So the second part below wouldn't even be an issue.
If the people at example.com have setup their SPF record to say that mail from unlisted networks should be bounced, the message will be bounced. If they've said it should be subject to additional checks, but not outright rejected, it will be accepted and the SpamAssassin score increased. The behavior is exactly per their setup.
-Ben
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