Doubt with imap/imap-login processes in proxy server

Hi,

I have a question I have not cleared after reading 

https://wiki.dovecot.org/LoginProcess.

I'm developing a proxy server (without director, because the backend 

server is specified by a ldap lookup).

My question is: the limit of imap (or pop3) concurrently users that the 

proxy can handle is determined by the imap-login limit or the imap one?

-- Angel L. Mateo Martínez Sección de Telemática Área de Tecnologías de la Información y las Comunicaciones Aplicadas (ATICA) http://www.um.es/atica Tfo: 868889150 Fax: 868888337