According to à ngel via mailop <mai...@16bits.net>: >On 2022-03-10 at 15:28 -0500, John Levine via mailop wrote: >> If you really want to stop mail loops, use a Delivered-To header like >> qmail, Postfix, and Courier do: >> >> https://datatracker.ietf.org/doc/draft-duklev-deliveredto/ > >You still need to stop at *some* hop-count. This approach stops >delivery loops, but not all loops involve a delivery.
Oh, I completely agree. My point is that Delivered-To catches most of the loops, so the cost of a large received limit is low. On my system, the SMTP daemon counts the Received headers with a configurable limit that defaults to 100. The main mail system does the Delivered-To checks which break a loop on any duplicate. In practice the latter always catches the loops and I don't ever recall seeing anything fail the 100 received limit. R's, John -- Regards, John Levine, jo...@taugh.com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. https://jl.ly
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