Mail app and traveling
I have Mail app on my iMac but travel a lot, how do I stop getting new email messages on my iMac that I check on my iphone?
iMac, OS X Mountain Lion (10.8.2)
Turn off the Mail app while traveling and then delete the messages you don't want on our iPhone. If you use POP mail (most likely) you can visit your email providers website and delete the messages you don't want.
However the simplest way to disable an account while still keeping it in the list of accounts (and having access to its maileboxes, etc.) is to go into the Accounts preferences, select the desired account, click the Account Information tab, and then uncheck the checkbox for 'Enable this account".