As I mentioned recently, I have decided it is time to change website host (partly because HostMonster keeps altering my .htaccess files, adding php version commands which cause my websites to stop working!). By the way, I did open an account with SiteGround, as most people suggested, but I am finding it hard to resist cancelling it because of NUMEROUS problems.
Anyway, I always use my website host as the email host too (with domains managed elsewhere). When I change website host, what's the best strategy & logistics for moving my customers' emails across too?
I will obviously need to give my customers new details to put into their email client, but when should I tell them to make the change?
How can I move their old emails (often 1GB or more in size) so they still have access to the archives on the new host? I can tell them to make a local copy of all their archives, I guess, but many people won't know how to do that.
Surely there will also be some downtime during the switch? Isn't it likely that some incoming emails will be lost?
Should I be messing with the domain's MX records at some point in this process, or just change the nameservers (which I believe changes ALL records in 1 shot)?
Can anyone point me to a web page which shows the detailed chronological steps necessary to handle this process optimally?