Deleting Gmail accounts but preserving emails in Zoho CRM

Deleting Gmail accounts but preserving emails in Zoho CRM

Hi, 

I am doing some admin work and want to delete Gmail accounts of ex-staff, but keep their emails on Zoho CRM.

All the ex-staff have Zoho (email) accounts that use the IMAP protocol.

Because I read that it is not possible to archive old emails using IMAP, I tried logging on as the ex-staff and changing their accounts to POP; however, for security/anti-spamming reasons, Zoho requires the registration of unique phone numbers. (I don't want to go to the phone shop and buy 6 pay-as-you-go phones!)

So...it is possible for me to delete the Gmail accounts but keep their emails on CRM?

I thought about doing a mass transfer of CRM records (i.e. from ex-staff to current staff) but suspect emails will be lost regardless (if I delete the Gmail accounts).

Many thanks,

Mike