Mail Limit?

[mbncd]

I've encountered this issue when sending things to my mules, and no, the recipient's mailbox can be empty aside from the mail you're trying to send them and it'll still be temporarily blocked. I find that going onto that other account and reading the mail helps clear the block so maybe it is a limit of how many unread mails you can have sent? Or within a certain timeframe? I dunno, just guesswork really. Curious about this too.

[Azriella]

I don't know if the persons mailbox was full, but I would hope 4-5 mailings wouldn't create a full mailbox.