SmarterMail 4.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

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 Connections - Some protocols in SmarterMail allow you to specify the maximum number of connections. 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.

IDLE Command - Check this box to turn on IMAP IDLE. IMAP IDLE is an extension of the IMAP protocol that allows a mail server to send status updates in real time. Through IMAP IDLE users can maintain a connection with the mail server via any mail client that supports IMAP IDLE, allowing them to be instantly aware of any changes or updates.
When enabled, SmarterMail will inform any connecting IMAP client that it accepts the IDLE command. Please note, IMAP clients that do not fully support IMAP IDLE, like Microsoft Outlook, may use the command in such a way that it actually degrades performance.


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 Connections - Some protocols in SmarterMail allow you to specify the maximum number of connections. 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 Connections - Some protocols in SmarterMail allow you to specify the maximum number of connections. 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.

Enforce SMTP authentication - When this option is enabled, SmarterMail will enforce SMTP authentication for all local deliveries. For example, mail from user1@example.com to user2@example.com must be authenticated even though the message is bound for local delivery.


SMTP Out

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.


Hostnames

This feature allows Administrators to assign a hostname for each IP address. For example: IP 1.1.1.1 can assigned to mail.domain1.com and IP 1.1.1.2 can be for mail.domain2.com. Prior to this addition, SmarterMail could only specify one hostname for all IPs.