What does doveadm who do?

It shows who is currently connected to IMAP / POP3 on your server via Dovecot.

Important: This is the most useful command when dovecot/anvil CPU usage is high.

username@example.com   192.168.1.25   imap   12
sales@example.com      103.45.xx.xx   imap   80
info@example.com       49.36.xx.xx    pop3   3

This usually means:

Rebar Couplers India
10 A & B Industrial Area(at Vill. Nangal Jarialan) Distt. Una, Himachal Pradesh
Una

Rock Bolts
10 A & B Industrial Area(at Vill. Nangal Jarialan) Distt. Una, Himachal Pradesh
Hisar

Fertichem Industrial Corporation
478/1 Gali Number 2 , Adarsh Nagar, Sector 13, Chandigarh, 160101

Shree Ji Packers And Movers
478/1 Gali Number 2 , Adarsh Nagar, Sector 13, Chandigarh, 160101

Packers and movers in Mohali
Plot No 636, Near HP Gas Agency, Dariya, Chandigarh - 160101
Mohali

JB Rock Bolts & SN BOLTS
10 A & B Industrial Area (at Vill. Nangal Jarialan)
Distt. Una Himachal Pradesh
Una

Packers and Movers in Zirakpur - Packers and Mover
SCO 3 AKS 2, Bhabat Rd, near Post Office, Zirakpur

Website Design and Development
Bangalore
Hyderabad

JF Engineering Products LLP
Parhar Village, Near Vasai Fata, Eastern Express Highway, Vasai (E), Palghar,
Motilal Nagar Mumbai

Nandishwar Steel
51 M.G. Mahimtura Marg, 3rd Kumbharwada Lane, Opp. Durgadevi Garden
August Kranti Marg Mumbai