I have had a problem with my iMac which I think I have repaired via utilities but now it is not finding mail any suggestions

Hello there talchris,

It sounds like you aren't able to get new mail on your iMac. I would use the troubleshooting for that in the following article named:

If you can’t send or receive email on your Mac

If there is any sort of connection or verification error the Connection Doctor should help you determine what the issue is. Thank you for using Apple Support Communities, let us know how that goes!