I'm trying to migrate email to zoho but am getting the message - unable to connect to server.  I have logged a ticket to check I have the correct server details with this host but just want to check first - 

• I haven't changed the MX records yet - do I need to do this before I migrate the email? 
• Do I need to enable IMAP somewhere in settings?

I have been following the help page on migration but it isn't clear in the section about adding an account to be migrated - specifically the following:

• Is the 'Source User Name' the same as the 'Destination Email Address'?
• What should I enter for 'Priority'?
• What should I enter for 'Exclude Folder List'?

Many thanks in advance,

Rachel