SASL login as another user - unexpected behavior on cyrus 2.4.17

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Hello,

 I run Cyrus-IMAPD 2.4.17 with many virtual domains:

	virtdomains: userid

I configured a domain administrator:

	admins: admin@xxxxxxxxxxx

With this account I can LIST all accounts in example.com domain only, as expected.

Let suppose the Cyrus-IMAPD server stores also accounts for other domains, such as example2.com domain.

Well, I see that I can SASL PLAIN login using admin@xxxxxxxxxxx on example2.com accounts too, if I know their names. I can't understand why this could happen. It seems a security issue.


Is there a way to prevent this issue without modifying ACL on all accounts?

Thank you
Marco
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