Auth0 Home Blog Docs

Hostname/IP doesn't match certificate's altnames

Hi!
I need to configure a custom SMTP and when I try sending an email testing I get this error:

"error": "Hostname/IP doesn't match certificate's altnames: \"Host: mail.blahbox.net. is not in the cert's altnames: DNS:*.bluehost.com, DNS:bluehost.com\""

any ideas?