On Mon, Oct 18, 2021 at 09:45:49PM +0800, Henrik Peng wrote:
> I have a domain in registrar saying it’s foo.com.
> Registrar has the email forwarding feature, so u...@foo.com will be
> forwarded to my gmail.
>
> I am not sure that, the registrar will forward email based on message
> header address or RCPT TO address?
If your email hosting operator determines which recipient rules to apply
via something other than the envelope recipient (RCPT TO) address(es),
move your domain to a competent hosting operator.
There is only one correct way to determine the recipient addresses of
a message, and that's the message envelope.
--
Viktor.
