On 07/06/2013 14:16, Nikolas Kallis wrote:
On 07/06/13 23:11, Mark Goodge wrote:
On 07/06/2013 14:06, Nikolas Kallis wrote:
Hello,



I just got an unsolicited e-mail from the domain 'bbbmail.com', which is
hosted at '46.235.78.1'.

'46.235.78.1' does not resolve to a host name, therefore 'bbbmail.com'
is not a FQDN.

'bbbmail.com' is a fully qualified domain name. That is completely
irrelevant to the question of whether the source IP address resolves to
a host name.

Mark

I thought for a domain to be fully qualified, it must have a PTR record
setup for it?

No, not at all. There are many FQDNs which don't have PTR records, and there is no requirement for a 1:1 correspondance between FQDNs, IP addresses, A records and PTR records.

Mark
--
My blog: http://mark.goodge.co.uk

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