SMTP rejected for some users

[Peter Newman]

For some of our users, their SMTP connections are being denied, with:

902 Host names have more than one DNS label

This error appears to come from https://codeclimate.com/github/msimerson/Haraka/plugins/helo.checks.js/source

I don't know how to walk them through finding out what HELO their device is sending to validate it, but it seems related to the plugin.cfg.reject.valid_hostname setting. Did this change in 5.0.3 ?

[Peter Newman]

This appears to be a case of https://forum.cloudron.io/post/6533 . Applying the linked setting change fixed the issue.