SMTP Issues

This section provides information and solutions for common operating problems. The best practice is to monitor transmissions and make configuration adjustments before problems occur. You can set up your system to regularly review transmissions and resolve bottlenecks.

Tip   The Queue Viewer utility is particularly useful for resolving message flow issues.

More tips to help you resolve SMTP message flow issues:

What problem are you having?

Remote messages are not being routed through the smart host.

A route domain may be designated for a remote domain you're trying to send e-mail to, and may be overriding the virtual server smart host setting.
Check your connectors and be sure a route domain hasn't been designated for the domain in question. Connector smart hosts will override those set at the virtual server.

SMTP Service starts, but the SMTP virtual server does not start.

The virtual server may have already been stopped when the service was stopped. A virtual server will only restart with the service if it was running before the service stopped.
Restart the SMTP virtual server in System Manager.

A client is denied Access.

The client's computer may not have proper access permissions.
To see if the client has the correct authentication credentials, on the SMTP virtual server's Access tab, click Authentication and Connection.
See also

Require Authentication for Incoming Connections

Set IP Address and Domain Name Restrictions

A masquerade domain is set, but the From header is unchanged.

The From header is only changed for the first hop. This is by design.