Undelivered mail with Zoho Invoice

Hi

I'm using a Google Apps domain which I have integrated with Zoho CRM. When mailing an invoice with Zoho Invoice - I get the following error:

Hi,

Your message to the following recipient was not delivered. Please find the details below.

Bounce Details:
Bounced Address : user@mydomain.com
Bounce Reason : policy-related Daignostic-Code smtp;550 5.7.1 Unauthenticated email from mydomain.com is not accepted due to domain's DMARC policy. Please contact administrator of mydomain.com domain if this was a legitimate mail. Please visit https://support.google.com/mail/answer/2451690 to learn about DMARC initiative. a75si21022689pfj.227 - gsmtp
Bounced Time : Dec 22, 2015 05:18 PM EST

Regards,
Zoho Team

I have no problem sending emails with Zoho CRM after I have setup SMTP, but how do I do the same for Zoho Invoice?

As a side note, is there a way to create workflows between Zoho CRM and Zoho Invoice? For example, can I update a field in the related Account in the CRM when I create an Invoice? Or can I mark an invoice as paid in Zoho Invoice when updating a field in Account in the CRM?
It's kind of confusing having both the native invoice module in Zoho CRM and Zoho Invoices. Would be great if Zoho Invoices would work natively in the CRM and replace the current invoice module in the CRM...

Thank you

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