I have several email accounts in order to segregate the source of email harvesters.

This means that my email client (Thunderbird) opens several POP3 connections, I think in parallel. As of 1/13/2010 I have noticed that not all of the email is automatically downloaded. If I manually walk through each account one at a time I get all the email.

If Lunarpages is throttling POP3 connections as a security measure it is not going to fly.

What about an office where there are a lot of users behind NAT? They could have dozens of users from one IP trying to connect.

I just opened a ticket for another issue on incoming (delivery to a Lunarpages hosted email account) SMTP rate limiting. As usual, it is taking a lot of repeating that I am talking about rate and not simultaneous connections in that ticket. However I did get a non-responsive post of the following:

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15  Maximum SMTP Connections Per IP
100 Maximum IMAP Connections
15 Maximum IMAP Connections Per IP
15 Maximum TLS/SSL IMAP Connections Per IP
50 Maximum POP3 Connections (Total)
5 Maximum POP3 Connections Per IP
5 Maximum TLS/SSL POP3 Connections Per IP
Number of Authentication Daemons 5

Please understand that on shared server, the configuration can not be customized.

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This response doesn't answer the ticket but it does shed some information on this topic.

As I said before, if you take an example office of say 20-30 users behind a NAT router the odds of simultaneous connections on that one IP makes the 5 POP3 limit seem low.

I would recommend that the wiki page at http://wiki.lunarpages.com/E-mail_Sending_Limits be renamed to E-mail_Limits, the above be included and kept current.