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Re:Postal: Open source mail delivery platform, alternative t... by j_s on Wednesday April 26, 2017 @10:50AM (#14203426)
There have been a few discussions regarding deliverability:

Why does Gmail hate my domain? | https://news.ycombinator.com/item?id=9855030

How to Avoid Spam Filters | https://news.ycombinator.com/item?id=10465639

If there are others I'd appreciate a link!

Re:Postal: Open source mail delivery platform, alternative t... by j_s on Thursday April 27, 2017 @11:25AM (#14212186)