On Sun, Dec 05, 2021, Slavko via mailop wrote: > But, please, what about header: > To: postmaster
> ... rejected after DATA: header syntax: unqualified address not > permitted: failing address in "To:" header is: postmaster The syntax for envelope addresses and header addresses is "a bit" different, and <postmaster> is a special case for SMTP but not for headers. Anyway, my mail was only about a clear violation of the (SMTP) RFC by comcast. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
