MX Records?
If I change an MX record, how long before it takes effect? Is it the same as updating DNS records?
TIA |
The MX record is a DNS record - just the particular one for Mail.
TTLs (time to lives) vary but are typically a day - so could take up to 24 hours to fully propagate round the INet. If you know its changing good ISPs will turn the TTL down a few days in advance - make the change, then turn it up. Deano |
They say 24, but i did some earlier and 1hr later it was changed.
Ollie |
Thanks
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The time is variable for many reasons - because DNS is cached by other dns servers.
So if Server A queried your DNS server for the MX record at 3pm on thursday and it had a 24 hour TTL. - it wont re-query until 3pm on friday. If you make your change at 4pm thurdsay - it could be 23 hours until the new address gets used - if you make the change at 2.56pm on frinday - it will 4 mins before the new address is used. Now there are hundreds/thousands of "server A"s making queries - so the server you tested via may have updated within an hour - but some may take upto 24 and some will be instant. Some servers ignore the TTL altogether and do their own thing ;) Deano |
Nice, never really thought about it like that
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