If you would like to setup different email ID in your quote/invoice/order documents then you can follow these instructions:
1. Click on Setting and under “About your company”, click on “Change your company address…” and change the email address in the address section.
2. On the Setting page and under Email section click on “Change email address…”, and select the checkbox.
3. On the Setting page and under Email section click on “Setup email template…”. Update the From email to new email address.
Once you complete the above changes then your login email will not be seen in any documents and emails by your customers.