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The Host Requirements RFC also says, I believe, that you are to respond to PING -- try that with www.microsoft.com. My point is, it appears that the Host Requirements RFC seems to be "interpreted" in the real world. Lots of sites seem to not implement postmaster.
My pet peeve is "501 bogus mail from" in response to "mail from:<>", as required by RFC1123. This just fills up my double-bounce mailbox with other people's bounces, and deprives senders of notification of delivery failures. So I stopped accepting mail from domains that refuse their own bounces. Ipswitch Imail is usually the culprit, with the "refuse null sender" mis-feature. - --- "The avalanche has already begun. It is too late for the pebbles to vote" - Kosh -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com> iQA/AwUBO9W3C0ksS4VV8BvHEQIHVQCgpHU6wGJwLFK9z5mTB8mSxP22msEAn0yA 9ZDao1YnuzwHAMmiXg8w0J+A =90em -----END PGP SIGNATURE-----