[zinekeller]

MTA-STS, a very recent standard (RFC 8461), only allows CRLF as the line terminator (to the chagrin of *nix lovers, and to the fact that a majority of mail systems are being operated on *nix systems)

[p_l]

Peril of writing protocols with an eye to debug them using cheapest terminal you can find on campus and a grad student paid in coffee