OK - so you have a separate password for your mac mail then. Mine is the same as my mac log in password. Mac Mail did it all automatically for me.(Makes life easier!)
A thought - -your mail password should be in your KeyChain Access? As long as you know your mac password (that you used for software update etc) then you should find you can see your mail password in there OK.
Go to Utilities> KeyChain Access app. In there you can see all your saved passwords and you can click on to see any one of them - so click on the mail one and it asks you for your mac password to show you its password.
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