2012-06-20 10:12 am EST
Without a specific account to test, I cannot answer definitively. However, if the settings are the same on both clients, and it works for one client and not the other, that generally points to it being a client issue.
I would reset the settings on the Mac, even delete the account and recreate it if needed. After that, you may want to either contact Apple support, or even consider using a different client such as Thunderbird.
Thunderbird can also be used as a test client on the Mac to see if it will work on that machine as well.
Here are two email troubleshooting links that may help also:
Troubleshooting Problems when Sending Email
Troubleshooting Problems when Receiving Email
I hope this answers your question. If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.
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