What do I do if all emails get forwarded to the postmaster because they "do not have local recipients"?
This message means the email does not contain at least a single recipient in it's "TO:", "CC:", etc header fields that reside in one of the "accepted recipient domains" configured in POPcon.
If you choose "filter mail by recipients domain only" in POPcon's POP3 configuration, POPcon needs to know which domains you do consider "local" to your exchange server, i.e. all the domains that you receive email for. Only these recipients are routed to your exchange server to keep the exchange server from bouncing the other recipients (think of an email with multiple recipients).
You can either add your "local" domains to POPcon's list of "accepted recipient domains" (format: "yourcompany.com", without "@" or "*") OR configure your POP3 mailboxes to forward all their email to only one single recipient (if applicable).
