Use the following screen shot to check your email settings on your Mac. This is from a working Apple email user.

Use your actual full email address as your login (both inbound and outbound server) Use the password supplied by Msen (both inbound and outbound server) Use mail.b.hostedemail.com as the server (both inbound and outbound server) Using the advanced IMAP settings, set the outbound port to 587.

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Also, you can use This Webmail link to access mail via the web and change your settings.