Send Mail from Lead/Contact/Potential not using default email address

Send Mail from Lead/Contact/Potential not using default email address

I have specified my company email address as my default under the sent as default email address. The default is automatically selected when sending emails from Zoho Mail (within CRM). But it does not select the default email address when sending emails from within the various modules (Lead, Contact, etc..). It defaults to my Zoho email account and I have to remember to change it?