In GitLab 7.8.x, smtp settings example file contained the line
openssl_verify_mode: 'none'. This meant that mail server TLS certificate wasn't verified by GitLab.
Confusion came from assumption that
none is the default value when TLS is enabled and that it behaved the same as when the setting is omitted. In contact with Rails team member we've learned omitting
openssl_verify_mode defaults to
If you have installation from source, smtp enabled, TLS enabled and the above setting we advise you to change the setting to
Installations using omnibus packages are not affected.