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Cisco Bug: CSCzv45099 - System doesn't try the IPv4 directions if all IPv6 destinations perm...

Last Modified

Sep 25, 2018

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

7.6.0-000 7.6.1-028

Description (partial)

When encountering a ServFail reply looking up a AAAA dns record the IronPort will be unable to deliver to a host, if configured for IPv6 Preferred delivery. Mail will queue and not try the A record for delivery.

AAAA record must return a ServFail
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