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A comment on Own-Mailbox, the first 100% confidential mailbox. Parent comment

Re:Own-Mailbox, the first 100% confidential mailbox by scintill76 on Monday June 29, 2015 @12:59PM (#9799300)
What is "valid"? I've been delivering personal email for 2 years from an IP whose reverse is like 1-2-3-4-static.hfc.comcastbusiness.net, and that name does not match what I put in my MX or HELO.

Now, granted, there are probably some systems that have issues with this, and maybe I do have failed deliveries I didn't notice, but you did say no email will deliver at all.

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Re:Own-Mailbox, the first 100% confidential mailbox by jlgaddis on Monday June 29, 2015 @03:59PM (#9800529)
The mail systems that I run (at/for an ISP) would block your mail (although I am probably more strict about what I will accept than most).
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Re:Own-Mailbox, the first 100% confidential mailbox by blfr on Monday June 29, 2015 @02:23PM (#9799903)
Valid is generally the one that matches your HELO, and in a perfect world your machine's hostname.
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