I was an email developer for a long time so I know the struggle! What platform is your current arch enemy?
Mine was Outlook 2013 for a while, but what was most annoying about fixing Outlook problems was the amount of Microsoft stooges in StackOverflow that would just point everyone to the MSDN article about the supported CSS properties which was often wrong or wouldn't address weird problems like how table cells couldn't be less than 15px tall ¯_(ツ)_/¯
Welcome to the club! Are you in the Email Geeks Chat group?
Outlook had always been a pain point. Where I work, we mostly email people who have company email addresses, so Outlook is a big part of our audience that we have to be aware of. Lately, Outlook 365 has been rolled out which has introduced new quirks.
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