When emailing to a MailYouLike user an email, if his mailbox is over (approximately) 1MB, no matter what his quota is, MailYouLike will return to the sender a "Mail could not be delivered because user has passed the allowed storage limit, try again later". But the MailYouLike user is still getting the email, confusing the sender who will probably send it again!
Not sure if this was the case before but this is true with v3.net patch 1.1
