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Symantec Messaging Gateway 10.0 - rDNS verification fails when querying round-robin DNS entries

Created: 03 Oct 2012 • Updated: 03 Oct 2012 | 1 comment

I have recently enabled "Reject connections where the reverse DNS record exists for the connecting IP address, but the 'A' or 'AAAA' record of the resulting domain does not match the connecting IP address" in DNS Validation.  We have found that senders are rejected if they use round-robin DNS records as the IP doesn't match the "A" record as the DNS server returns a different IP on each query.  We have had to disable this DNS Valication check.  Does anyone know a work around for this, or is Symantec working on a fix?

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BenDC's picture

This may be a great canidate to submit as an idea for the product.