Dnia 16.09.2022 o godz. 11:15:41 Grant Taylor via mailop pisze: > > I may be naive in my belief, but I do believe that you know how you operate > your email better than I do, and that if you tell me that you only send > email from X, Y, and Z, and that anything else is not from you, well, I'm > going to believe you.
Well, when I'm sending the mail, I can never be sure which route it will take. What I know is that in *first step* the mail will be sent from X, Y or Z. But there's always the possibility that the mail I send to [email protected] will be forwarded from there to [email protected]. I can't know that. And as you surely know, forwarding breaks SPF. You can argue about rewriting the envelope-from, but this doesn't matter because standard forwarding as it is configured in MTAs doesn't do this and you have to use special tools. And I don't agree with those who say we should give up forwarding and instead use fetching mail via POP or IMAP by the "target" server from the "source" one. This is a crazy concept that might appear only as a poor workaround for mailbox providers that didn't give the users an option to forward mails. Forwarding is much simpler and more flexible (eg. you can set up a filter to forward only selected messages) and is compatible with the whole concept of email, which works on "push" and not "pull" principle. Not mentioning the fact that you have to store credentials for your "source" account on the "target" server, which may be a security concern. So I can never be sure what IP addressess will my emails be actually sent from. Therefore, for me "-all" doesn't make sense; the most we can say is "~all", but even this can be doubtful; what is "actually true", and what the sender knows for sure, is "?all" - nothing more. There is one and only one case where "-all" is actually meaningful: when it is the only token in the SPF record, that is, the domain declares that it doesn't send mail at all. -- Regards, Jaroslaw Rafa [email protected] -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub." _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
