This looks like your mail server is rejecting that address, if it is just because of the format, you could try a similar format that has the same meaning, according to the RFC the address should be written as:

From => "IDI Solutions <$proactiveEmail>",
or
From => "$proactiveEmail (IDI Solutions)",

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In reply to Re: MimeLite Header Problem by jasonk
in thread MimeLite Header Problem by kleinbiker7

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