I am creating a system which allows members to email content to it and have it instantly and automatically parsed.
I asked a question regarding using a custom SMTP server for intercepting mail. One of the reasons for this is that it's easy to scale up should demand increase (just setup a new mailserver). One of the suggestions was to use IMAP IDLE instead to monitor a single mailbox.
My question is, how scalable is this? If I had one mailbox with a wildcard email alias to capture all mail, how much mail could it handle at one time without grinding to a halt? If I were to go the route of creating a separate mailbox per member, what would be the best way to monitor each one?