[slrainka]

What are some of the open source/low cost email options that don’t have to deal with the headache of email deliverability, black list management etc.

[ies7]

I selfhosted mailcow (almost default setting) in a proxmox vm with ip from an internet provider for business. Never had problem with deliverability.

A few employees have problem syncing calendar to their phone or outlook but it's less than 1% users.

[EasyMark]

and security (handled by someone much better at it than me) in particular

[patrickhogan1]

I gave Zoho a compliment, not sure why there is so much defensiveness.

You are right - open source requires more work. My response related to open source was responding to the article's tone that it was surprising that anything could be cheaper than Google or Microsoft :) Which is silly.

[dartharva]

How on earth is that comment defensive?

[patrickhogan1]

Good point. I have been up way too long. I re-read the question now as just wanting alternatives.

I read the question earlier about email deliverability and black list management as being rhetorical in that those services are usually performed by a centralized service provider.

Glad someone was able to respond with some examples.