Features > Outgoing Mail > SMTP Settings SMTP SettingsOptions | Outgoing Mail | SMTP Settings-tab
 The SMTP settings dialog allows the configuration of additional settings for the SMTP client.
The default host name used in mail server HELO/EHLO conversations can be adjusted here.
Limit Recipients Per Message
This dialog allows Administrators to control how many recipients a message may have, and is normally used to control abuse. | 
