Enginy added multi identity campaigns, which let one campaign send from a pool of several email mailboxes or LinkedIn accounts instead of a single sender. Leads go to the sender with the fewest active conversations, and once a lead has any activity the same sender handles every follow up. Senders can be added after launch but removed only while the campaign is a draft.
Spreading volume across senders raises throughput, and it is also the pattern email providers and LinkedIn watch for, so teams should keep each sender inside its own limits.