Number of connections per IP / POP3

[Zeitkind]

Well, yes, POP3 is still good for fetching logs and such from several accounts belonging to several different servers, also mailing lists are still POP3 for me, just to keep the email-addresses separated in case the list gets hacked and spam floods the list (which happened earlier) and there is no need to store mailing lists on a mailserver.
People having this problem are all sysadmins or simular, also people fetching mail for several accounts (instead of using ETRN or relaying) to an internal mailserver. Most of them are stuck and wait for Apple to fix this issue, because they don't have the control over the mailserver.
Regarding ispcp - yes, it's a job for the sysadmin, not for resellers or users, because courier has only one global setting for that.