Why am I not able to send invoices, quotes, etc. when I use an AOL email address as my primary email address?

If you create your Zoho Books account using an AOL email address, you won’t be able to send invoices, quotes to your customers as AOL’s DMARC policy does not allow Zoho Books to send emails on behalf of users/businesses using AOL addresses.

Hence, we advise you to change your primary email address created under a different domain. To know more about how to change your primary email address, kindly click here.