I dont know. But its possible to forward mails from Gmail to rediff.
i am using Gmail to forward a copy of all incoming emails to my rediff account.
This way:
i can check my mail thru the rediff account in case there are some problems with Gmail.
i can recover accidentaly deleted mails.
I can delete mails with large attachments.
I dont have a rediffmail or a gmail acount so I cant guarantee that this will work but i guess it might be worth trying if you got that much messages to forward. For this to work you need to be able to receive the messages from gmail in an email client and be able to send messages to rediffmail from that same client .
For ex. if you could download your messages to Outlook I think you might be able to create a rule to forward messages to your rediffmail account. ( But again this would only work if you could receive messages from gmail in that client as well as send messages to rediffmail from that client.
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