On Fri, Jul 05, 2024 at 07:45:10PM +0800, Jeff Pang via mailop wrote:
> When an user requests to join mailing list, which address should we
> take? The envelope address, or the header From address?
The envelope sender address is the address to use for bounces, SPF and
little else. It can change in transit (e.g. SRS). Therefore, you
should use the *header* "From:" address, which is also the address that
replies would typically go to, ...
The actual email address of the message author appears in the "From:"
header, and that's the address that is requesting to join the list.
--
Viktor.
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