I haven't gone as far as emailing support, but my single tweet asking if there would be a postmortem after a previous incident did not receive a reply. My other tweets to them, such as inquiring about a recent increase in spam, received replies.

I've admittedly put in very little effort to obtain postmortems from Fastmail. But I also posit that I shouldn't have to. Postmortems should be made readily accessible, just as the outage was. I reserve my detective skills for figuring out my own service's outages.