What matters most? Brian K Simon Ooley
We must warm up our email inboxes before running any campaign if they are newly created. Older inboxes are generally good to go without warm-up, as they are already warmed up.
If you're early-stage, sending <10,000 emails/month and want ease of use, go with Instantly.
If you're scaling fast or need tighter control over deliverability, go with Smartlead.
Both work well with Clay using webhooks or tools like Make.com/n8n for more custom workflows.