Been using self hosted mailinabox on a cheap racknerd vps for last 4 years. Zero hiccups. The trick is to send an email, have it whitelisted a bunch of times.

Been using self hosted mailinabox on a cheap racknerd vps for last 4 years. Zero hiccups. The trick is to send an email, have it whitelisted a bunch of times. Then it just works. Once I massmailed by mistake. Google rightly spammed the emails. Had to unspam them and was back within a few days. Outlook was worst but even that worked. Its 100% doable