I always thought it was clever that the PNG format was designed so that readers could catch various kinds of transfer errors, including the error of accidentally using FTP ASCII mode (rather than binary mode). That way you get a very clear error message, rather than some confusing CRC failure.

http://www.libpng.org/pub/png/spec/1.2/PNG-Rationale.html#R....

(ASCII mode automatically translates line-endings, which can break non-text formats in confusing ways)

You never had to enter a real email address (or anything that looked like an email address) on any anonymous FTP server I've ever used. You could usually leave it blank, but if a server really wanted me to enter something and I didn't feel like mashing the keyboard, I would sometimes use the address of the server's administrator or some well-known email address that wasn't mine.

You can just put webmaster@ (no domain) and that almost always works it there's any check. Maybe ftpmaster@ would be more appropriate though.

I always used me@myhouse.org :-)