On Fri, Aug 13, 2021 at 08:09:06PM +0200, Alessandro Vesely wrote:
Also MUAs can take advantage of any mailbox values found there, as a
sponger. For example, Thunderbird has a configuration item named
catchAllHeaders which can be set to a list such as "envelope-to,
x-original-to, to, cc, delivered-to".
The "Delivered-To" header is NOT for MUA consumption. Any MUA using
"Delivered-To" for anything other than display to the user as diagnostic
information is violating the contract, and deserves whatever
misbehaviour ensues when it seems something new and/or unexpected.
--
Viktor.
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