Hello there, first of all, this is my context : I have mydomain.com The FQDN of my ISPConfig serveur is web.mydomain.com My DNS Zone is managed from OVH not from the ISPConfig. I have a SPF and DMARC entry on my DNS Zone, theses are OK. In ISPConfig I have my email Domain created and I have enabled DKIM and generated the DKIM keys. Got something like that : Code: default._domainkey.mydomain.com. 3600 TXT v=DKIM1; t=s; p=PUBKEY In OVH I created a TXT entry and this is what I got : Code: default._domainkey.mydomain.com IN TXT "v=DKIM1; t=s; p=PUBKEY" When I check mydomain.com with default as selector from this https://www.mail-tester.com/spf-dkim-check, I got my DKIM right. But when I test an email from my ISPConfig (sending it to mail-tester or gmail), mail-tester says DKIM is not OK, and I have nothing on the original mail on gmail. And I can't figure out why ? Any guess would be appreciated.