smtp helo string

[mrmurdock]

Not being familiar with what the "helo" does in smtp, what should be in that field when configuring the media type Email in Zabbix (tried to google it but cant for some reason correlate that with the Zabbix setup).

I can run mailx just fine from the Linux based zabbix server command line and it gets sent to the smtp relay server, and I receive just fine in my email client that we use.

[RichardCA]

The FQDN (full hostname + domain) of the server that initiated the SMTP session.

Try giving this page a quick read.

http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

If you are still confused after reading that, welcome to being a Sys Admin.