I received the following question today:
I happened to come across an article you have written after I received the Mailchimp Omnivore update. My question is does Mailchimp accept me to use my gmail address to send out emails? I have tried everything keep getting the same response. Should I setup an email address for my company?
Mailchimp notes that due to DMARC policies of free email providers, domains like yahoo.com, aol.com, and gmail.com can no longer be added to your verified domains. Furthermore, to be able to send a Mailchimp campaign from an email address, the email address must first be verified. Campaigns may not therefore be sent from Mailchimp using Gmail.
The solution is to use an email address that uses your own domain.