> Do you know why many providers even those big ones didn't implement SRS when > forwarding email to other ESP? > > for instance, outlook.com, mail.ru, and even google domains who has > specificed email forwarding feature for their domain users, don't have SRS > enabled in their forwarded messages. > > Since I am using SPF as a validation method, the non-srs messages from those > big providers will have possibility to break SPF and be rejected by our > systems. > > How to improve this then?
External forwards are problematic nowadays. Some providers offer pop3/imap fetchmail to poll external mailboxes instead. Best regards Gerald
