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"The domain already exists in the list." appears in Domain-based Delivery in InterScan Messaging Security Virtual Appliance (IMSVA)

    • Updated:
    • 13 Oct 2015
    • Product/Version:
    • InterScan Messaging Security Virtual Appliance 8.2
    • InterScan Messaging Security Virtual Appliance 8.5
    • Platform:
    • N/A N/A
Summary

The error message appears when you specify multiple IP addresses for the delivery method of a particular domain. You can enter the following in the InterScan Messaging Security Virtual Appliance (IMSVA) console under Administration > IMSVA Configuration > SMTP Routing > Domain-based Delivery:

abc.com > 10.0.0.1:25
abc.com > 10.0.0.1:25

However, as soon as you click Save, after entering the second record of abc.com, the error message appears:

The domain already exists in the list.

Details
Public

IMSVA uses Postfix for MTA. With Postfix, one cannot forward a domain to multiple IP addresses. This is not a product limitation, but a limitation in MTA because the transport file of postfix will only accept one domain to represent an IP.

As a workaround, you can create records in your private internal DNS. As the administrator, you can then configure IMSVA to deliver the message to a server name which will be configured with multiple A records for the domain. The DNS server used by IMSVA can be set manually. You can refer to the Administrator's Guide for the procedure on how to set the DNS manually.

Example:

In the Domain-based delivery section in IMSVA, add the domains where IMSVA accepts email from. In the Delivery Method for these Domains, enter the name of a mail server, for example, xyz.abd.local.

Once done, create multiple A records for this server in the DNS server that points to the external email servers. This will allow the IMSVA server to send the email to as many email servers that you created A records for. Be sure to create the A records on the local DNS server that the IMSVA server is checking for the name resolution.

A record for xyz.abc.local = 10.0.53.5
A record for xyz.abc.local = 10.0.53.6
A record for xyz.abc.local = 10.0.53.7

You can give these different values, if you like, or the same value and then the mail should be delivered round robin.

Premium
Internal
Rating:
Category:
Configure; Troubleshoot
Solution Id:
1056817
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