MX Record Propagation

Posted by Ryan on Server Fault See other posts from Server Fault or by Ryan
Published on 2012-04-05T18:28:24Z Indexed on 2012/04/05 23:32 UTC
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How long does it take a change in MX records to propagate? Is the MX record TTL the max time it will take or do we also need to wait for all DNS records to propagate?

We are changing our mail server from Exchange 2003 to Exchange Online. Our current MX records (at Network Solutions) have a 1 & 2 hour TTL (primary and backup MX respectively). When we change the MX records to point to Exchange Online should all MX records worldwide be updated within 2-4 hours or should we assume the traditional 48 hours for DNS to propagate?

I assume that once all MX records propagate that all new incoming email will be directed to the new server.

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