Does Cyberpanel support SRS (sender rewrite scheme) for email forwarding? I couldn’t find any details on it.
The reason for this is using an SMTP relay service, I also forward inbound email to a backup gmail address. Hower without SRS, the outbound email domain is the originating email address and not the local hostname so it gets bounced.
550 err commondomain This message from domain does not pass SPF checks from see https://mail.outboundspamprotection.com