Relay of rejected E-Mail / SBRS Score too low

Angus_MacGyver

Dear all,

I recently changed my mailcow installation from a classic netcup “Root-Server” to an “vServer (ARM64)”.
Unfortunately this also means that I have lost the “history” / “credibility” of the IP of the old server.

Now I get the following temporary rejection from a recipient server:
“554 #5.7.1 Delivery not authorized, message refused. - Reason: Bad SBRS-Score. Please contact your local administrator.”

As I´m using mailcow just for my and my familys private use I`m not sending ourt much e-mails it could take quite long until the new IP has gained a better score.

I`m wondering if it will be possible for example to send out only e-mails which got rejected in the first place by a professional e-mail provider like for example Postmark?

If something is possible I would love to get a detailed how-to on how I could achieve such a relay.

Or alternatively what could I do to inprove that SBRS Score?

Thanks,
Angus MacGver

esackbauer

SRBS is Cisco Senderbase. You should be able to delist your IP via www.senderbase.org but it seems that site has a problem at this moment.
Alternatively use sendgrid as relay server, they are free for up to 100 sent mails per day (for all users together).
Or ask your provider for a different IP address.

KaiserN

esackbauer

fyi: https://blog.talosintelligence.com/senderbase-org-redirects-to-end-in-april/