Outlook 2011 for Mac 14.4.7, yesterday I suddenly started getting error - 17099  "<A> invalid address" on a hosted email account (POP/SMTP) that had been working fine for a long time.  For two days I get the error virtually every time Outlook attempts a send/receive "to this email account".  No email settings have changed, no recent updates have been applied and my local network/router/devices/etc has not changed.  The hosting company says it's not their problem, yet my other (ISP based) email has no such problems.  I have fiber/broadband, so my connection speed is excellent.  Any thoughts?

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