1 domain email account accessed by other domain webmail

I found an interesting thing in hestiacp mail service,
I don’t know this is feature (intended/untended) or bug.
I have 3 domain and each has mail domain same:
mydomain1.com and webmail.mydomain1.com (for mail login)
mydomain2.com and webmail.mydomain2.com
mydomain3.com and webmail.mydomain3.com
Also each domain has 1 email account:
[email protected]
[email protected]
[email protected]
So when I open any webmail domain (eg: webmail.mydomain2.com)
I am able to login and use any email account of any other mail domain (like: [email protected])
So I can login and send email from any account of any domain by any other domain.
Eg:
I open “webmail.mydomain2.com” then login on “[email protected]” and use it.
There is no restriction like I am only able to login that email account which is come under opened domain mail.
Like: webmail.mydomain1.com can only able to login/open “[email protected]” not "admin@mydomain2/3.com.

So is this feature or bug?

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As it is all hosted on the same server it will connect to the same mail server…

Ut should not matter as still uses their own password

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Thanks sir, I also think same in subconscious mind, but not sure so I think let ask here, actually I like this feature. It’s easy to use for me.
Unfortunately I put same password to all accounts “my bad” :laughing: I will change it.
Anyway thanks again for help this quickly.