Session Limits
Each email account is subject to a maximum limit of POP and IMAP connections that can be initiated on LS Suite servers by the same IP address.
The values set by default are more than enough for regular mailing traffic through a user's email client:
- 50 simultaneous sessions for IMAP;
- 10 simultaneous sessions for POP.
This limit may be reached. For example, if you configure the same email account on multiple stations and various devices (like smartphones), and each account is connected to the same corporate network. In this case, the problem manifests itself with an incorrect username and password. You can reset the number of active connections simply by closing and reopening your email client. If this procedure does not work, there might be other problems to be solved on your PC. It could be an antivirus. Alternatively, it could be a firewall issue that prevents the sessions from closing correctly, even after the email client is closed, due to blocked TLS connections. You can usually find more information and directions on how to solve the issue on the website of your antivirus manufacturer.
You can analyze each email account's log info on Tracemail. With this tool, you can ensure that the issue of incorrect username/password is caused by reaching the maximum number of connections.
To avoid this kind of issue, we recommend configuring your email account on a single PC and, if configured, also on a Smartphone and tablet. This allows you to access it through your data, rather than via Wi-Fi or ADSL. We also recommend assigning each person a single personal email account (e.g., [email protected]) and setting up generic email accounts (info@, sales@, …) as Email Aliases to these individual accounts.
Read our documentation on Email Alias to know more about this feature.
Thunderbird
If you use Thunderbird, you can change the number of open connections for each account in the settings: Settings > Server settings > Advanced > Maximum number of connections to the server to be kept in the cache (set it to 1).
MS Outlook
If you use MS Outlook, you cannot change the number of connections opened on the IMAP server. In this case, we advise you to remove the subscription to the IMAP folders that you do not use frequently and to set a control frequency for new messages between 15 and 25 minutes (this does not affect the notification of the arrival of new messages, which remains in real time). The error disappears immediately by closing the email client because the connections are immediately closed on the server side, too. If the error persists, contact our technical support by opening a Ticket to perform an in-depth analysis.
