[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.