Is there a limit for the long size of mailbox name in cyrus-IMAPd?

[Wang Penghui]

Hi all:

Does cyrus-imapd server have the limit of long size of mailbox name?
For example:

A virtual domain named: my.example.com
And the login name is myaccount at my.example.com.

Is there any limit with the login name? If yes, what's it?

Thanx

Wang
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