I am permanently changing my primary email account from Optimum to Gmail, and have successfully forwarded all the old/current emails in my Optimum "Inbox" to a newly created Gmail folder, using this procedure provided by Gmail.

But, I don't know how to forward my "Sent" folder from Optimum to Gmail. Does anyone know how to do this?

1 Answer 1


I did it by using a third-party email client (Thunderbird) and an IMAP connection between my old email mailbox and my new (Gmail) mailbox. Once the accounts are set up it's simply a question of dragging and dropping from one account to the other.

  • I installed Thunderbird, ran it, and it imported my old "Inbox" from my old account into Thunderbird (not to Gmail). But I still haven't figured out how to force it to import my old "Sent" emails from the old account. I tried Thunderbird "Help", IMAP Syncronization, didn't see anything good there.
    – honda_pg
    Jan 30, 2018 at 4:11
  • I simply dragged-and-dropped the messages from the Sent folder in one mailbox to the Sent folder in the other mailbox.
    – ale
    Jan 30, 2018 at 14:09

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