[Dovecot] Meaning of mail_max_userip_connections?

Hi,

I set mail_max_userip_connections in our IMAP configuration to

mail_max_userip_connections = 10

to allow users 10 parallel connections. It seems that this also limits the amount of parallel connections from one IP but different users?!

Our users mostly accessing the IMAP server by a webmailer or proxies. Thus, all users (>10000) come from only 5 different IP. However, I got a lot of complaints about denied connections after setting mail_max_userip_connections = 10.

Am I right with the meaning of this parameter?

Thanks in advance

Harry