SSL certificate verify failed

[sysdev]

Anybody have an idea? The domain has a valid letsencrypt cert on the domain, including the www and mail.

2021-09-13T22:15:30.149+02:00 spamexperts d6fe6b981c2315c79b41cac35f30b1e9: INFO "1mPkhB-00038K-Ou","com-mpt-out002.mailprotect.be","mydomain.com","info","queued","2021-09-13 20:15:30","11.22.33.44","25","mail.mydomain.com","TLS session: (SSL_connect): error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed"

 

[ikkeben]

Version ssl on both sides for the check and connection...? don't know but could be a issue

test on some online mailtesters

Local mail server or external mx and mail?

 

[sysdev]

I can not check the version on the spamexperts server as that is far out of my reach. But it seems like the remote server can not validate the directadmins server certificate for a domain.