Also IT guy by trade,
I’ve ran a quick scan on the domainname and saw that your ceritificate is not valid for mail.audi-sport.net. Your issue lies somewhere that the certificate from Lets Encrypt is handed out for webmail.audi-sport.net and you are using mail.audi-sport.net as hostname of your emailserver sending out emails(?). This would make sense regarding the warning as you send out emails with a certificate to mail.audi-sport.net and your webserver DNS resolves to webmail.audi-sport.net. This does not match making the certificate invalid. Not 100% sure on this one as I can not check your environment.
Code:
Cert Hostname DOES NOT VERIFY (mail.Audi-sport.net != webmail.audi-sport.net | DNS:webmail.audi-sport.net)
So email is encrypted but the host is not verified
Not Valid Before: Mar 10 04:26:10 2022 GMT
Not Valid After: Jun 8 04:26:09 2022 GMT
subject= /CN=webmail.audi-sport.net
issuer= /C=US/O=Let's
Also, looking up the SPF record I noticed you guys didn’t put a hardfail (-all) in the record but rather a softfail (~all). This could potentially cause your domain name to be spoofed as with a softfail like you have configured now the receiving emaillserver does not check if the sending emailserver is set within the SPF.. well, it does, but as its a softfail it will just let it through either way. So, Somebody could potentially spoof the domainname with his/her own mailserver… FYI.
Sooooo, lets get your IT guy to work here
