Thanks for the reply. I need a specific system (mac address) only should be able to use imap and pop service with the help of cyrus.
That doesn't make it much clearer. You know that MAC addresses are only visible in a local subnet, right? Why don't you restrict access by IP address? I have a hard time imagining a reasonable scenario where what you ask for is necessary ... that's why I was asking what you're trying to achieve.
To answer your original question, I don't think there is any mechanism that allows for restricting access based on MAC address. Certainly not within Cyrus, possibly using iptables or such.
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