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:

ShreeJi Packers And Movers
415/1, IT Park Road, Shastri Nagar, Sector 13,

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

Best Gastroenterologist in Ahmedabad
Ambika Chowk, Ramnagar Rd, Opposite Ramji Mandir, Sabarmati, Ahmedabad, Gujarat 380005
Ahmedabad

Lanco Pipes and Fittings
Shop No.1, Ground Floor, Plot No- 89 / 91, Shree Ram Mandir Marg, 4th Kumbharwada, Girgaon
August Kranti Marg Mumbai

ASIAD STEELS
59/ A, Ardeshir Dady Street, Nr. Alankar Cinema,Mumbai - 400 004, Maharashtra, .
Motilal Nagar Mumbai

THAPPAMARK
street no.4. 1ST floor 22/138, Motilal Nehru Road, near Mufid-E-Am Inter College, Agra, Uttar Pradesh 282004
Agra

Metal Yard
117, Bldg No.91, Durgadevi Street, 4th Kumbarwada Lane
Anu Shakti Nagar Mumbai