The new editor needs HTML editing available. Period. Outlook, as always, is a huge issue that you need control over HTML to really deal with. The last line on this page: https://knowledgebase.constantcontact.com/articles/KnowledgeBase/6754-image-and-table-gaps-in-outlook-2007-2010-2013-or-2016?lang=en_US Literally says to edit HTML. "If you're comfortable using HTML, insert your own breaks to space your content or add a style to automatically include a page break before each table row."
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