Increase Courier-IMAP Limits in Plesk
Plesk is configured with the following limitations for Courier-IMAP.
1. A single IP address can establish 4 connections simultaneously.
2. IMAP connections are not established more than 40 connections.
You can increase Courier-IMAP e-mail server limits by editing the file - ‘/etc/courier-imap/imapd’.
Steps:
1. Open the file - /etc/courier-imap/imapd
vi /etc/courier-imap/imapd
2. Navigate the line “MAXPERIP”. You can find the value as 4.
3. Change this value as per your wish and save the file
MAXPERIP=12
4. Navigate the line “MAXDAEMONS” and change its value to 80
MAXDAEMONS=80
5. Save the file
6. Restart Plesk service
/etc/rc.d/init.d/psa restart
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