I'm trying to use Gmail to manage a MS Exchange email that I log into with Outlook Web Access. The Exchange email has IMAP and SMTP access but not POP3 access so I can't use Gmail's "check mail from other accounts" feature but I can use the "send mail as" feature. An inbox rule to forward all mail to the Gmail account doesn't work either.
I want to use Fetchmail and something else, possibly Postfix, to retrieve mail from the Exchange email and pass it along to Gmail. I'm not sure what the proper name is for that second operation, that is, placing the retrieved emails in my Gmail but not sending them to Gmail. Maybe "transferring"? or "pushing" an email? This might be why I can't find what I want on Google. I don't I want to forward the mail. It should appear in Gmail as if I had used the "check mail from other accounts" feature.
Right now, Fetchmail works - I can retrieve mail from the Exchange server, but I don't know where to go from here or what terms I should be using to search. I think what I should be trying to do is use Postfix to transfer the mail to Gmail via SMTP but I'm unsure.
There are a few questions and blog posts out there by people trying to access Exchange with Gmail. Those all involve either forwarding (doesn't work for me) or using just Fetchmail. The Fetchmail-only solutions specify smtp.google.com as the smtphost in the poll. I can't get this to work and it doesn't make sense that it would since the Gmail password is never given. (Further searching - it looks like fetchmail doesn't support ssl on the smtp side.) Some solutions also suggest using Thunderbird to do this. I'd rather not.
I can't find anything on Google about people using Postfix to transfer mail to Gmail. Instead I find I lot of people relaying mail through Gmail.
Is the approach I've outlined sensible or do I fundamentally misunderstand something? Can I use Postfix to transfer mail, already retrieved, via SMTP to Gmail as described? What is the appropriate name for transferring mail like this?
EDIT: The transfer to Gmail should be automatic and regular. This is not intended as a onetime backup but rather as a way to receive email.