In Qboxmail every email accounts have an IMAP (50 sessions) and POP (15 sessions) connection limit per IP address.
if you configure the same email account on an excessive number of locations and simultaneously on various devices (such as Smarthone) you can get a a “username and password” request as if these were incorrect, because you’ve exceeded the session limit.
You can reset the number of active connections by simply closing and re-opening your email client.
If this procedure does not work, there may be other issues to be solved on the user’s PC, such as an Antivirus or Firewall that does not shut down sessions properly even after the email client is closed or because they block TLS / SSL connections . Normally, an antivirus vendor can find instructions on how to resolve the issue. Below are some links related to this topic:
To verify the issue of the “username / password” request is that of the maximum access number you can scan the user logs through the ETLive tool in the Qboxmail Control Panel.
To help you with this problem, we recommend to configure your email account on a single PC, for Smartphone and tablet is racommended to configure the access throught 3G.
We don’t recommend to configure generic email account on more users.
Each user must be assigned their own personal email account (eg john@COMPANY) and generic accounts set as alias to individual personal email accounts.
Thunderbird users can change the number of connections that each account opens in its settings:
Tools > Account Settings > [select your account] > Server Settings > [Server Settings section] > Advanced > Maximum number of server connections to cache > enter 1
For MS Outlook users it is not possible to change the number of connections to the IMAP server. In this case, it is recommended that you remove the unused IMAP folders subscription and specify a different mail check interval between 15 and 25 minutes (this does not affect the notification of the arrival of new messages that remains in real time).
The error disappears immediately by closing the email client because the connections are also immediately closed on the server. If the error persists contact our technical support for more in-depth analysis.