I migrated from a bare metal server in my office to an IONOS dedicated server, and since, all outbound emails are failing to land from email clients, but outbound from the usermin webmail does go out.
nmap / netstat for reference
Relevant info - JustPaste.it
I checked, and the credentials didn’t change during the migration according to the users area.
I checked the DNS @ godaddy for an MX record, which I have pointed to the servers hostname, not the sites.
IONOS insists they aren’t blocking any ports.
I’m at a loss, please help, the office is very angry.
SOLUTION NOTE: When Ubuntu tried to add the opendkim user, for whatever reason the groups file was locked. Rebooting, then reinstalling dkim brought the server back up in short order.