Wesley via Postfix-users:
> Hello
>
> I have a question about forwarding email to Gmail. Gmail requires the
> sender to provide identity authentication, including SPF or DKIM. Some
> of our old customers do not have dkim configured in their email system,
> but they do have spf. There is no problem sending messages directly to
> Gmail because SPF has been approved. However, if the customer's mail is
> forwarded, such as through a mailing list. The forwarding server uses
> SRS, so the sender in the header cannot pass SPF verification because
> envelope is rewritten to the address of the forwarding server. For
> sender in header, SPF is not checked, and DKIM of the original letter is
> missing. Therefore, this email will be rejected by Gmail. Is that
> correct? Is there any other way to improve this besides adding dkim?
This is why mailing lists (including this one) replaces the From:
header address and the envelope sender address with its own address.
The addresses are in the list manager's domain, therefore the Mailing
list server's DKIM signature and SPF satisfy policy.
Wietse
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