Hi friends, We are a company seeling products on ebay, aliexpress, amazon. And we had 200,000 more email extract from our ERP All these customers purchased our products. Now We want send them emails, we are trying with sendgrid.com and sendy.co& Amazon ses. The thing is, they all need domain verified. We have domains but not related the way we obtained these emails, and we don't want our platform store related to our own e commerce site. Is there any bulk mailing software we can use without domain verfied Or can we verify irrelevant domain to do the email marketing. Any suggestion appreciated.