I'd rather kill myself than host SMTP again
old.reddit.com
old.reddit.com
my bosses were pissed I wouldn't let them mass mail to all users without the clients permission. (these were the clients' lists). That didn't help.
When the business broke, they didn't bother renewing the domain.
Couple years later one of them asked me, informally, if I knew of a better email service than the one they were using now; it was charging them "postal rates"... "Can't help ya, so sorry."
One of the biggest issues caused by the big 3 is unpublished blacklists. M$ and Goggle especially will send email from smail servers to JUNK (or something equivalent) or in the case of M$, accept the mail and then simply not deliver it to the end user at all.
Overcoming this issue is tedious and uncertain, and for some never accomplished.
I think a true general statement is that increased oligopoly in email service is detrimental to personal/small business email providers, and primarily benefitial to the major service providers.
https://discourse.mailinabox.email/t/how-to-unblock-from-mic...
It’s always sad to read such reports. I’m glad to have never run into any significant issues with my own mail server for personal use.