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MX records

DAST
Dabbler
Posts: 17
Registered: ‎07-01-2008

MX records

Hi,
I've ammended the MX (& A) records at my domain registrar to point to my Plusnet (static) IP as I plan to run my own mail server. Things don't yet work as expected and (on checking with http://www.mxtoolbox.com) all records (even name server which I haven't changed) appear to be set to 255.255.255.255. Is this some interim state and I should I wait a bit longer. Its close to 72 hours quoted for propagation of records.
Does anyone know if some sort of check is done when the MX record is changed? For example if my mail server/router is not set up correctly would this prevent changing of the record (or can it be set to any IP address)?
Thanks in advance
p.s. I've put in a support request to registrar but wondered in meantime if anyone here had anu suggestions.