If you don't have subfolders on UTMath mail server, you can use these instructions to migrate your email to Gmail or you @utexas.edu email. The following instructions is for migrating multiple mail folders to other accounts.
The simplest method to transfer your UTMath out to other servers is to use a modern email client, like Thunderbird.
The requirement is that your other email server must allow IMAP access. All major email providers support IMAP. For example, gmail, yahoo, office365.
In the following, I'll show your in detail how to transfer your UT Math email to an @utexas.edu account using Thunderbird.
Open your Thunderbird application, open the Account Settings dialog. It is listed under one of the main menus (For Mac, it is under Tools, for linux, it is under Edit).
Select "Add an Mail Account" from the "Account Actions" menu at the bottom.
Fill in your name, your UT Math email address and your login password. Hit Continue.
On the next screen, hit the "Manual Config" button while Thunderbird is trying to figure out connection settings.
On the manual configure screen. Enter the Server settings as the following.
Thunderbird should now list your UTMath account on the left pane in the main window. If you click on your Inbox, it should retrieve and list your emails. If you click on the little down arrow to the left of your UTMath account, it should expand and list all your mailboxes.
The instructions for adding gmail to an IMAP client is described here. List below from my test. The two important points are:
Logon to your @utexas.edu (or gmail ) account, click on the little gears icon on top right and select "Settings".
On the Settings screen, click on "Forwarding and POP/IMAP" and check Enable IMAPTurn on "Lesser Secure Apps"
Goto https://www.google.com/settings/security/lesssecureapps and turn it on.
Goto you Thunderbird Account Settings and select Add Mail Account again. On the first screen, fill in your @utexas.edu email account info, and hit Continue.
On the next screen, click on the "Manual Config" button.
Fill in the server info as the follows.
You should now be able to check your @utexas.edu (or gmail) via Thunderbird.
The first thing you need to do is to file your email to folders. You can't move your main INBOX directly (well, you can using POP, but you can't migrate other folders using POP.). You should be able to create subfolders under either accounts. For example, I create a new folder MAIN under my test UTMath account and moved everything from my UTMath Inbox there. I also create a folder mtest@UTMATH under my @utexas.edu account. I'll use this folder to store all my old emails from UTMath.
To move UTMath mail folder to your @utexas.edu account, simply drag the folder and drop it onto a folder under your @utexas.edu account. For example, I dragged and dropped all folders from my UTMath test account to the mtest@UTMATH folder under my @utexas.edu account.
Please contact us if you encounter issues during migration.
If you don't plan to use Thunderbird after you finish your migration, simply delete the application. Otherwise, you should delete your UTMATH account from Thunderbird.
If you want to continue use your @math.utexas.edu email address, please send your forwarding email to us. Your UTMath account will be closed around the time specified in your first closure notification.