I'm using Mailgun to send out registration emails that contain a verification for new registrations on my website.
I'm not using a dedicated IP and the emails are sending from firstname.lastname@example.org
I've noticed email delivery is slow to gmail addresses, so I assume I'm getting throttled by them. I send out on average 1,200 emails per day, and about 400 of those go to gmail.
So my question is, being owned by Google, if Gmail considers my emails excessive (not spammy) can this affect my SEO and rankings in Google?