Following are directions for how to transfer your email from your existing Internet Service Provider to May First using a desktop email program like Thunderbird. If you haven't already, please read the overview on transferring email.
The general idea is to configure your email program to use two different accounts: one account is your existing Internet Service Provider and the second account is May First. Below are the steps:
At this point - your email program should be configured to access mail from both your existing Internet Service Provider and May First. Now it is safe to make the switch.