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Re:Show HN: OpenBSD Email Service – A free-email alternative by icebraining on Friday February 16, 2018 @02:12PM (#16394998)
Do you have a fixed or dynamic IP? When I tried sending email from my home network (which had a dynamic, if long-lasting IP), I discovered my ISP's addresses where on the PBL[1] and therefore getting rejected by many servers. This was in Europe, not the US.

[1] https://www.spamhaus.org/pbl/

Re:Show HN: OpenBSD Email Service – A free-email alternative by a012 on Friday February 16, 2018 @09:00PM (#16398425)
SE Asia here and many IP blocks (/19) of my ISP are blacklisted, even blocks those are being used in datacenter in that bigger block.
Re:Show HN: OpenBSD Email Service – A free-email alternative by gsich on Friday February 16, 2018 @02:20PM (#16395109)
/29

And of course, not hosted at home.