Have you been using it consistently? From what I've heard, it's hard to not get blocked by any mail provider in the long run and spend a lot of work in making sure it stays this way since some block lists may just block you because you are in the same IP range as other etc.
I used it a bunch. But for a special purpose so it didn't get tested with a lot of email providers.
Anyway, I brought it up because the article is so pessimistic you'd think that even my example would not work, which simply is not true.
Also Bitcoin dev Matt Corallo hosts his own email too last I checked. AFAIK he hasn't had too many issues with sending. But he has his own IP address space so...
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