This redefines "reaching across the aisle" :)

Same here. And, as someone father up this thread observed, forcing a big exodus in a short span of time is the Best possible way to bootstrap this migration :)

That brings back memories! Thanks so much :)

This is beautiful! Thank you for making and sharing!

How did you start polishing? Do you do this professionally? How might a random person get started in this, as a hobby? Thanks :)

(The following is second-hand experience) You should google "DKIM and SPF" before you embark on this journey. The tl;dr of it is that senders of email can (and do) end up blacklisted based on the IP Address of their mail server. If you run your mail server on (say) a.b.c.xx and a known spammer happens to rent a vps from the same provider at a.b.c.yy, you both end up blacklisted. The spammer moves on, whereas your emails fail t make it through other folks' spam filters, and there won't be anything you can do about it.

Thank you for the thoughtful response. I'll look forward to your post describing your process!