In cPanel/WHM versions up to 11.52, users were able to choose between two mail servers: Courier and Dovecot. Courier was selected by default, and most cPanel users never had reason to switch. However, beginning with cPanel/WHM version 54 (the preceding “11” was dropped), Courier has been deprecated. cPanel will no longer support Courier in future releases, and will automatically convert the mail server to Dovecot if it has not been done manually within 30 days of updating to cPanel/WHM version 54.
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