Cannot send / receive emails

I have recently upgraded to ML on both my iMac and Macbook Pro. Although they were both fine before, I now find that I cannot send or receive emails on the iMac. I can receive but not send on my Macbook.
I also have a PC, on which I can both send and receive, so it is not the server. All my settings seem to be OK. I appreciate that this has been discussed in previous posts, but I am at a loss as to why one machine half works but the other does not. Any ideas would be very much appreciated.

The upgrade to Mountain Lion in this case may have caused the Mail app to lose all of its Incoming Mail Server and Outgoing Mail Server (SMTP) settings in Mail>Preferences>Accounts.  This happened to me and others in this Forum.  You would need to contact your ISP to obtain the correct settings for these two servers and re-enter them in the above location.  I know, Apple slipped a bit on this one.
Hope this helps

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