Possible to switch accounts within Zoho?

Possible to switch accounts within Zoho?

Hi Guys,

is it possible to switch between accounts within Zoho?
Means if every User in our Agency has 2 different Accounts (because of 2 different Emails), can he swich from
User 1 - user1@mycompany.com to User2 - user2@mycompany.com?
Or do we have to log out everytime and change useraccount?

Why do we need this?
We have 3 different Projects with 3 different EMail-Accounts: ...@agilis.at, ...@agitel.at and ...@tele2.at

e.g. if i have to send an estimate for telecommunications (...@agitel.at) i cant send from my mainaccount (...@agilis.at).

So, is there an option to switch or do we really have to login, logoff, change account, login, send estimate, logoff, switch to mainaccount, login... ?

best regards from vienna!