Hi, Victor_Ivanidze,
because I don't see the reason why I can use alias only for recieve, but I could not be possible to send from this address. In other words, as it is working in users' alias.
Reason 2: I've migrated emails from another domains. There are 2 different domains. I can say 1 new and 1 old (but still woking and still should be able to send from this domain).
And for the other hand it is request of customers. And I still don't see regular reason why I could not be able to sand email from alias of shared mailbox.
Please if you have advice for your opinion, that is better to have as many shared mailboxes as many you have aliases. My mind is open and I hope that the minds of the customers too.