https://clickz.com/4as-ana-team-with-dma-for-e-mail-guidelines/73318/
4As, ANA Team With DMA for E-mail Guidelines - ClickZ
Mar 13, 2018 - The three marketing trade groups endorse a set of principles for responsible e-mail and skip any spam definition.
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https://www.mdedge.com/content/adopt-guidelines-e-mail-questions
Adopt Guidelines for E-Mail Questions | MDedge
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https://aub.edu.lb/communications/Pages/mass-emails.aspx
AUB Mass E-mail Guidelines
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