Timeout for Remote Mail Servers
How long the SMTP service will wait for a response from a remote mail server before disconnecting.
Outgoing queue poll interval
How often the SMTP service polls the outgoing queue directory for mail messages to send. This is measured in seconds.
Limit outbound message size
Forces MailEnable to check the size of each message before delivering to a remote mail server. If the message cannot be delivered it will be returned to the sender (or sent to the bad mail directory if the message is system generated).
Outbound IP Binding
Forces the SMTP to use a specific IP address on the server when it is trying to deliver email.