I want to move an old website from a client's office server to a new hosting account but I need to leave the email accounts on my client's office server. I have done this once or twice before and what I did was to change the domains nameservers to point to the new hosting account and then in the clients new hosting account I setup a new MX record to point back to their office hosting. The problem is that this there is a lot more emphasis on email and also I may have to do the transfer midweek and possibly in the middle of the day so they don't want any real email downtime. I have 3 questions
- If something went wrong and I needed to switch back might it take a long time for the nameserver to propagate back. I guess the answer here is yes so if that was the case then would it be that the emails sent to the domain during that time would be lost.
- Could I test that the new MX record on the new hosting was working properly before I switched the nameserver over.
- If everything was setup completely right might I still end up with downtime.
- If I did an MX lookup now would the IP that I find be the one I would use for the new MX record on the new hosting.