When deleting an e-mail on Gmail, the display reverts to the Gmail log-in window

Question

When deleting an e-mail on Gmail, the display reverts to the Gmail log-in window. Internet Explorer does not have this problem. Firefox did not have this problem until a few weeks ago.
Firefox version 1.9.2 3855

Answer 1

Ernie,
The OP appears to be concerned about sent messages in particular, which, as you know, wouldn’t be on the server no matter what the settings and would certainly be lost as a result of deleting the account.
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thesameage,
Deleting a POP account only deletes the messages stored in the account’s mailboxes. If you move those messages to custom “On My Mac” mailboxes or to the mailboxes of another account, you won’t lose them. It’s not that Mail goes after your mail trying to delete as much as it can. It’s just that if a mail account is deleted, then its mailboxes cannot exist anymore...
Here’s the title of some Mail Help articles that explain how to create “On My Mac” mailboxes and organize your mail there however you wish:
Creating a mailbox
Organizing your email
Alternatively, a quick and simple procedure to create a duplicate of the account’s mailbox structure as “On My Mac” mailboxes would be importing them doing File > Import Mailboxes, choosing Mail for Mac OS X as the data format, and selecting the ~/Library/Mail/POP-username@mailserver account folder.
That said, instead of deleting the account right away, you can just disable it (i.e. turn OFF Preferences > Accounts > Advanced > Enable this account), leave it that way for some time, and delete it only after making sure you didn’t miss anything while the account was disabled.
BTW, if you back up your data, and the ~/Library/Mail folder in particular, you won’t have to worry about accidentally losing anything as a result of doing something like that...
Note: For those not familiarized with the ~/ notation, it refers to the user’s home folder. That is, ~/Library is the Library folder within the user’s home folder, i.e. /Users/username/Library.