Hello

Please first see zabbix_log I attached.
How did this happen and how it is fixed?

Before we were using smtp with no authentication because all warning mails we were sending were being sent to the same mail server (organization domain).

Recently we had a problem which was requiring sending emails to some people outside the organization.  
So we set Authentication to Username and password (in media types section), then put `[email protected]' as username and some password consisting of `#` and `@`.

As soon as that special problem happened, zabbix_server crashed.