Why did you set up the account initially with a wrong password? If you wanted to avoid Mail connecting to the server until you had set the
IMAP Path Prefix, I don’t think it would make a difference, but a better way to accomplish that would be bypassing the Account Setup “Assistant” altogether by holding the
Option (Alt) key down when clicking the
[+] button in
Preferences > Accounts, unless you’re setting Mail anew, in which case the Account Setup “Assistant” cannot be avoided. Is this the only account you have set up in Mail?
The only things I’m aware of that could have a bearing on this is the account being offline or any custom rules you may have. Is the
Mailbox > Go Online command enabled or disabled?
Open
Window > Activity Viewer and tell Mail to check for mail on this account. What do you see there?
Look for additional information that may be available in the form of error messages written to the Console:
1. Open
/Applications/Utilities/Console.
2. From the
File menu, choose either
Open Console Log, or
Open System Log, or both, so that Console displays the contents of both
system.log and
console.log.
3. Reproduce the problem and look at the bottom of the Console windows for messages that might be written there as a result.
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Try this to check whether the problem is system-wide:
1. Go to
Apple Menu > System Preferences > Accounts and create a new
user account for testing purposes.
2. Either log out of your main user account or just quit Mail so that it does not interfere with the other user account.
3. Log in as the newly created user and set up Mail anew there.
4. For
spam-related security reasons, go to
Preferences > Viewing and disable
Display remote images in HTML messages if it’s enabled.
5. Check whether the problem also happens when logged in as another user.