The concurrent session limit refers to the maximum number of simultaneous connections (via POP3, IMAP, or SMTP) allowed to your mail server. This applies to all devices and email clients accessing the mailbox at once. For example, if the limit is 10 and 10 devices are connected, the 11th device will be denied access until one session ends. Sessions are “taken” when a device or email client connects to send, receive, or check emails. For instance, opening Outlook on a laptop and checking emails counts as one session, and opening an email app on a phone counts as another, and so on.

The number of concurrent sessions allowed for your domain depends on your subscribed plan. Contact the helpdesk team for further details.

To ensure optimized session usage:

• Configure your email clients to use IMAP instead of POP3, as POP3 may create additional sessions when checking for new mail.
• Avoid setting email clients to check for new messages too frequently.
• Ensure a stable internet connection to prevent repeated disconnections and reconnections, which can increase session usage.