troubleshooting Question

Slow outbound SMTP connector in Exchange 2003

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jmitchell2005 asked on
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I have just migrated to Exchange 2003 from 5.5 and all is ok apart from a problem where outbound mail sits in the smtp connector queue for about 20 minutes before being delivered.
Exchange 2003 is configured to use a smart host, who are a an external company doing AV scanning on all our email.
I can telnet to the external smtp server and they also host our MX record.

The internal network has primary and secondary DNS servers with forwarders configured.

Please help.

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