We are currently aware that customers using Shaw e-mail configured in Mac Mail on the new release of Mac OS X (Yosemite) may be experiencing difficulties while sending & receiving emails.
If you have upgraded to OS X (Yosemite), please see these documents for instructions -
OS X 10.10 Yosemite - Adding a New Account:
OS X 10.10 Yosemite - Resolving Errors on Imported Accounts:
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