WebAdmin Help

SMTP Agent: Options

Provide the SMTP Agent settings > click Apply to save the settings.

Flags
The Flags section lists a series of standard SMTP commands that can be supported on the current SMTP Agent. Select the commands you want the SMTP Agent to accept.

Allow VRFY Command
The VRFY command allows external clients to verify that a user exists in your messaging system. If enabled, VRFY can pose a security risk because it allows external users to anonymously request verification of user names. For example, if spammers want to find out the usernames in your company, they could query the system with a series of user names until the system verified a valid username.

Allow EXPN Command
The EXPN command expands a group name upon request and lists all the user names in that group. This command is also considered a security risk because it allows spammers to anonymously request group membership lists. For example, if a spammer requests to expand a system-wide group such as Everyone, the SMTP Agent will return the complete membership list which is, essentially, every username in your organization.

Verify Addresses on Receipt
By default, the SMTP Agent accepts all incoming messages and places them in a queue for address verification processing as resources are available. This facilitates rapid message processing. If you want the SMTP Agent to perform address verification before accepting messages into your NIMS system, select Verify Addresses on Receipt.

Send ETRN
The SEND ETRN command requests a remote server to send any messages it has queued for your messaging system. This option is primarily for organizations with dial-up Internet connections.

Accept ETRN
The ACCEPT ETRN command allows a remote server to request queued messages. If enabled, the SMTP Agent responds to this request by sending any messages it has queued for that system. Accept ETRN is the only SMTP flag that is selected by default.

Mail Relay Host [Forwarder]
A mail relay host is a relay point for remote messages. Select Enabled to funnel all remote messages through another SMTP Agent rather than having the current SMTP Agent access the Internet. Specify the host name or IP address of the SMTP server that will function as the mail relay host. All messages going through this SMTP Agent will then be forwarded to the SMTP Agent running at the designated address.

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