On Fri, May 12, 2023 at 12:44 PM John Levine via mailop <mailop@mailop.org> wrote:
> It appears that Bill Cole via mailop < > mailop-20160...@billmail.scconsult.com> said: > >On 2023-05-12 at 09:40:14 UTC-0400 (Fri, 12 May 2023 13:40:14 +0000) > >Paul Gregg via mailop <pgregg+mai...@pgregg.com> > >is rumored to have said: > > > >> I suspect with verp/bounce addressing widely in use now, 64 octets > >> just isn't enough these days. > > > >Hogwash. 64 mail-safe octets is adequate for every domain to give a > >unique printable(!) deliverable local-part to every elementary particle > >in the universe. It's a namespace adequate for ANYTHING > > If only. You run out of octets pretty quickly when you are doing hacks > like the IETF's anti-DMARC workaround which turns > mailop-20160...@billmail.scconsult.com into > mailop-20160228=40billmail.scconsult....@dmarc.ietf.org Yes, VERP and SRS are the two most obvious cases where their design inherently doesn't work with the limit (encoding the full email address into the mailbox portion) You'd need to either get fancy with the domain portion, which has its own complications (multi-level star DNS?) or use a lookup table. The full namespace is also not available, our experience was that relying on case in that portion of the address was problematic, as there were many systems who would lowercase the address before using it. Brandon
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