A tip on how to get mail to work with O2 SMTP servers.

Question

I found I had a problem in Mountain Lion where Mail could not log into the O2 SMTP servers even though I was using the exact same settings that were on my iPhone, iPad and MBP running Lion?
Well I finally found a solution.
In Mail open preferences and click on Accounts and select the account in the lefthand pane.
Click on the Outgoing Mail Server (SMTP) and in the drop down menu select Edit SMTP Servers to get:
Normally the radio button against Use Default Ports would be checked, instead check Use Custom Port and insert the number 25 and click OK.
Now back at the Accounts window click on Advanced at the top to get:
Make sure you have Port 110, on mine changing the SMPT to 25 also altered this to 25 so worth checking. When you have finished close the preferences and click on save, quite Mail then restart hopefully all should work now.

Answer 1

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen. Click the Clear Display icon in the toolbar. Then take one of the actions that you're having trouble with. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.