Please add the option to choose multiple senders/smtps/gmail accounts to send from for each outbound email campaign, so the system automatically rotates the sending volume among them according to each smtp's daily sending limit.
This is the feature used in cold mailing apps like Lemlist, Emelia, Mumara, Mailwizz. This is must-have feature if you want to use multiple domains with multiple email accounts to scale up cold mail outreach.