That's probably reasonable, but you might want to amend 2 to "split the string on the last '@'". There's no restriction to only '@' before the domain. It's exce

That's probably reasonable, but you might want to amend 2 to "split the string on the last '@'". There's no restriction to only '@' before the domain. It's exceptionally rare that a server even allows '@' in the mailbox name, fortunately for us.