Locked Domains - Mail Passwords will not be set to original

I use 1.2.9 on a Debian wheezy Root with some Customers / Customer-Domains.
Every year the point at the expirience day the customer give feedback, that no mail is possible.
Then I activate the domain and in the past all went fine, but suddenly the mailpasswords are changed and no user on an expired and new activatet domain can send or receive mails.
Whats the reason? And is this behavior also in 1.2.11?
It took about one hour to find the reason, why the mailaccounts on a newly activated domain does not run - only on a look into the database and mailtable I did found the reason.
Is this a feature or a bug?

mhm - let me try to explain:
If the expiration date of a domain is set in imscp (pic1), then the accessibility of this domain will be deactivatet after this date is reached (loo pic2)
Then if that deactivatet domain will be activatet and a new expiration date in the future has been set manually (in the date field pic1) the domain is reachable per http and https, but the mailaccounts not.
Custumers can not acces their mailaccounts as before the deactivation of the domain. Because this occured every time, if a account was deactivatet, searched and found, that every password on every mailaccount of the former deactivatet domain where changed. And they where not changed back to its former value after the manual reactivation of the domain. Thats the reason, because no user can login at his mailaccount nor a client nor with webmail.
Is this a feature or a bug? - because it is not jokey to search, why mailaccounts dont went well....

Thanks Nuxwin, nice to hear that you'll fix it and that there is meanwhile a patch...