> if it bounces, the user has only himself to blame So your system always makes the least effort and pushes the blame to users. Great. How about just even do

> if it bounces, the user has only himself to blame So your system always makes the least effort and pushes the blame to users. Great. How about just even do a minimal check that is /.@./ so that the basic format is at least there or if you'd take 10 minutes to look around, you'll find the regex browsers are using and just steal it and be done with it, so most of the malformed inputs are warned to the user before the user realizes the confirmation email isn't arriving minutes (or days) later and possibly lose the conversion right there. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/email#basic_validation https://developer.mozilla.org/en-US/docs/Web/HTML/Element/in...