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Outlook for Mac

each time i use microsoft outlook to send messages, it says: 5.7.0 must issue a STARTLLS command first. How do I do that?

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Older post from September 7, 2013. Details may be out of date.

Question asked on Sep 7, 2013
I really do not know how to solve this problem.  Please help me.  I do not understand the message issued by the computer. A hint would be that my former work address appears on Outlook.  I retired last year and this address was cancelled.  Could this be part of the problem?  I scratch my head!

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