Add every mailbox you want to send from. Passwords are stored encrypted on the server and never shown again.
Paste a list (emails, phone numbers, anything — one per line) to see which are new and which are already in the database. Capital/small letters are treated the same; phone numbers are compared by digits only.
Nothing new.
No duplicates.
Lines are checked against the database.
Import your existing baza.txt (paste its contents), or clear the whole database.
Each employee signs in with their own username and password and sees only their own SMS and emails. Admins see everyone's activity and manage accounts.