Ask HN: One email, multiple team members

If you have a very small company, usually you go with a main email info@domainname.com etc. How do you handle that with may be 2-3 employees ?

For example, lets say that you get on an average of 20-30 emails per day on info@domainname.com. If Mary looked at 5 of them, but then went away and John came later and he sees that someone probably read those but who ? Was a response sent ? Ok he can check the Sent folder but is there a better way ?

So tl;dr is that is there a way to use the same email address but tag the emails in such a way that different team members know how read it, what they did to it, was a response sent and any subsequent followups ?