If I switch to a good external smtp service with limits that work for me and I then turn off the phpbb3 queue (email package size = 0), will a post hang unacceptably if the forum is mailing 70 email notifications at once (the usual number for most posts on my forum)? How about 500 users (an occassional post triggers email notifications to all users on my forum)?
What I'm really trying to figure out is this: if I spend the money to move to an external smtp service, will it then be practical for me to turn off the phpbb3 queue?
Thanks, both of you. And that's an interesting thing for me to check, brf. When you say bad address, you mean one that is incorrectly formed (as opposed to one that doesn't exist), correct? For example, one with a space or without an '@' in it?