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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