> Sending a lot of bounced emails is going to get your mailservers reputation tanked, which is not an acceptable tradeoff for removing email validation. ?!? O

> Sending a lot of bounced emails is going to get your mailservers reputation tanked, which is not an acceptable tradeoff for removing email validation. ?!? OK, let's break this down: What could be reasons for an email to be bounced due to an invalid address? 1. Because the address is syntactically invalid: Your own email server will notice and reject/bounce the email. Noone outside your own server will notice. 2. Because the domain doesn't exist or has no inbound mailserver: Your own email server will do the DNS lookup(s) and bounce the email. Noone outside your own server will make any note of that (and you can't find out without doing DNS lookups anyway). 3. Because the localpart doesn't exist: You can't find that out without trying to actually send an email (and consequently risking a bounce). So, what exactly was the point of email validation "without bounces" again? The only thing you can actually do to avoid unnecessary bounces is to make sure your emails have a valid return path and to make sure that you somehow process all the bounces that arrive there to make sure that you don't continue sending emails to addresses that start sending bounces (i.e., that don't exist (any more)). If you send lots of mails, it's probably best to employ VERP for that.