As cold emailers scale outreach, a common tactic many platforms offer is:
“Rotate IPs to bypass ESP sending limits.”
Sounds great in theory.
But do real humans change IPs every 5 minutes while sending emails?
Human behaviour is the Gold standard for ESPs.
When someone sends emails manually (say from Gmail or Outlook):
Now flip that!
If you start sending emails from:
If your cold outreach practice/tool randomly rotates IPs, you could trigger:
What is your experience been with IP rotation?
“Rotate IPs to bypass ESP sending limits.”
Sounds great in theory.
But do real humans change IPs every 5 minutes while sending emails?
Human behaviour is the Gold standard for ESPs.
When someone sends emails manually (say from Gmail or Outlook):
- All emails go out from one static IP unless they have different office locations.
- The sending pattern is predictable: a few emails per hour
- Replies are handled naturally
- There's no spammy content or suspicious automation
Now flip that!
If you start sending emails from:
- A single domain (yourdomain.com)
- Across 5–10 different IPs in a day
- With identical or templated cold messages
If your cold outreach practice/tool randomly rotates IPs, you could trigger:
- Spam classification
- 4xx soft bounces (deferred by recipient)
- Domain/IP blacklisting
- Deliverability degradation, even on warmed domains
- ESPs correlate IPs with domain reputation
- They log the source and look for inconsistencies
- A single domain suddenly emailing from 10 different IPs = suspicious
What is your experience been with IP rotation?