Rejected mails from within airvpn

[Justin 1]

Hi all.
Several mails got rejected when sent from within airvpn. It seems that timmehosting.de don’t like airvpn. As soon as i deactivate the vpn the mails got thru. The  mentioned adress @musikding.de is just an example.
here is the reject message i get every now and then. It’s always timmehosting.de:
info@musikding.de:
SMTP error from remote server for TEXT command, host: mail.timmehosting.de (78.46.230.212) reason: 554 5.7.1 Spam message rejected
Edit: german exit node in berlin, cause munich and frankfurt are to slow.
Best regards,
Justin Edited ... by Justin

[OpenSourcerer 1435]

Probably a "good" old denylist in effect. It's sad that people still rely on that and not on SPF, DKIM and DMARC but, well, it is what it is…