I’m facing an issue with spam filter and email delivery report.
When I’m sending email to my friend which use mailcow too, the “Sucessfull delivery” email is scan by rspamd and invalid SPF and DKIM is found.
Same happen when he send me an email.
I understand why SPF and DKIM is KO, it’s because it’s sent by mail.company.co or mx.company.co and SPF and DKIM entry is valid only for company.co
What I didn’t understand is why is this happen only whith mailcow backup ?
If I send email to gmail.com or other mail server, the successfull delivery email don’t show up in rspamd, and I receive it.
Should I need to configure something in order to have valid SPF and DKIM for delivery report ?