Workflow
Sending infrastructure and list verification
Some teams send cold email from separate domains and mailboxes so a problem does not reach their main domain. That limits the damage; it does not stop bounces from happening.
What separation does
A separate sending domain keeps reputation trouble away from your main one. Bounces still count against whichever domain sent the message.
What verification adds
Verify the list so fewer messages bounce on any domain. Send a small first batch from each new mailbox and check bounces before scaling. Follow your mailbox provider’s published limits.