The issue that Brett faced (and potentially the original poster) is becoming more prevalent across the email industry.  L-Soft have published an online Tech Tip that has a good analysis of a similar situation and offers at least one solution to try in LISTSERV, and which should work across all service providers and systems.

http://www.lsoft.com/news/techtipLSV-issue3-2017.asp

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  Michael Shannon
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