SmarterMail 3.x Help
This documentation is for a product that is no longer supported by SmarterTools.

Protocol Settings

This configuration page allows you to establish policies for the standard email protocols. This page is tabbed and no settings will be saved until you click on the Save button.


POP

Session Timeout - After a connection fails to respond or issue new commands for this number of seconds, the connection will be closed.

Command Timeout - If the server receives a command that sends large amounts of data and the data stops coming in for this number of seconds, the command will be aborted.

Maximum Bad Commands - After this many unrecognized or improper commands, a connection will be automatically terminated.

Maximum Threads - Some protocols in SmarterMail allow you to specify the maximum number of connections. One connection maps to one thread in SmarterMail. Increasing this value allows SmarterMail to handle more connections of that type at once, but results in higher CPU and memory utilization.


IMAP

Session Timeout - After a connection fails to respond or issue new commands for this number of seconds, the connection will be closed.

Command Timeout - If the server receives a command that sends large amounts of data and the data stops coming in for this number of seconds, the command will be aborted.

Maximum Bad Commands - After this many unrecognized or improper commands, a connection will be automatically terminated.


LDAP

Session Timeout - After a connection fails to respond or issue new commands for this number of seconds, the connection will be closed.

Command Timeout - If the server receives a command that sends large amounts of data and the data stops coming in for this number of seconds, the command will be aborted.

Maximum Threads - Some protocols in SmarterMail allow you to specify the maximum number of connections. One connection maps to one thread in SmarterMail. Increasing this value allows SmarterMail to handle more connections of that type at once, but results in higher CPU and memory utilization.


SMTP In

Session Timeout - After a connection fails to respond or issue new commands for this number of seconds, the connection will be closed.

Command Timeout - If the server receives a command that sends large amounts of data and the data stops coming in for this number of seconds, the command will be aborted.

Maximum Bad Commands - After this many unrecognized or improper commands, a connection will be automatically terminated.

Maximum Threads - Some protocols in SmarterMail allow you to specify the maximum number of connections. One connection maps to one thread in SmarterMail. Increasing this value allows SmarterMail to handle more connections of that type at once, but results in higher CPU and memory utilization.

Max Hop Count - After a message gets delivered through this many mail servers, it is aborted by the software. This prevents looping due to DNS problems or misconfigurations.

Max Message Size - Messages greater than this size will be rejected by the mail server.

Max Bad Recipients - After this many bad recipients, the SMTP session will be terminated. This setting allows you to better protect yourself against email harvesting attacks. A value of 20 is recommended in most cases.

Submission IP:Port - The submission port is a special SMTP port that requires SMTP Authentication in order to be used to deliver any mail whatsoever, regardless of domain-specific settings. This setting is an advanced feature that is typically used when a whitelisted inbound gateway is being used for spam and virus scanning, and all other SMTP traffic is blacklisted. Note: This setting will not function until the Enabled checkbox next to the setting is checked.

Enable VRFY command - Check this box to enable the Verify Mailbox command in SMTP. This will allow others (including other mail servers) to verify an email address on the server. This is considered by some to a security risk, and should not be checked without understanding the ramifications.

Enable EXPN command - Check this box to enable the Expand List command in SMTP. This will allow others to list all users associated with an alias or list. This is considered by some to a security risk, and should not be checked without understanding the ramifications.

Bypass relay settings when using SMTP authentication - When this option is checked, senders that are verified with SMTP authentication can send from any address, and relay settings are ignored. When this option is not checked, relay restrictions are enforced even if the sender is authenticated.


SMTP Out

Gateway Server - Specifying the IP address of a gateway server in this box and checking the Enabled checkbox will turn on gateway mode. Relaying to a gateway will send or route all outgoing mail to another SMTP server before it reaches its final destination. The destination SMTP server would have to be configured to take relays from your particular IP address. For example, if the destination SMTP server was a SmarterMail Server, then the IP from the original mail server would need to be added to the White List unless "anyone" was selected for the "allowing relay for" option. For more information about the roles of Gatewaying, please see Gateways and Other Server Roles.

Important Note: When using a mail gateway, SmarterMail statistics may not be accurate due to the fact that a single mail with multiple recipients, is only handed off as one, but would have been sent as multiple emails.

Outbound IP - Use this box to select what IP address is used to deliver outbound messages.

Command Timeout - If the server receives a command that sends large amounts of data and the data stops coming in for this number of seconds, the command will be aborted.

Max Delivery Threads - Enter the maximum number of messages that can be sent at one time to email addresses that are not on the local server. If a message cannot be sent, the SmarterMail Server's multi-threading capabilities will move on to the next message and eventually get back to the one it skipped. This action can save tremendous amounts of time when compared to some other mail servers that stall the spool if a message can not be sent right away.