Rate this page:

IP Warmup

IP warming is the practice of gradually increasing the volume of mail sent with a dedicated IP address according to a predetermined schedule. This gradual process helps to establish a reputation with ISPs (Internet Service Providers) as a legitimate email sender.

SendGrid can automatically warm up dedicated IP addresses by limiting the amount of mail that can be sent through them per hour. The limit determined by how long the IP address has been warming up.

See the warmup schedule to learn how SendGrid limits your email traffic for IPs in warmup.

You can also choose to use Twilio SendGrid's automated IP warmup for any of your IPs from the "IP Addresses" settings menu in the Twilio SendGrid App.

Retrieve all IPs currently in warmup

GET /v3/ips/warmup

Base url:

This endpoint allows you to retrieve all of your IP addresses that are currently warming up.


  • API Key


default: Bearer <<YOUR_API_KEY_HERE>>



The IP address.


A Unix timestamp indicating when the IP address entered warmup mode.

    "ip": "",
    "start_date": 1409616000
        Rate this page:

        Need some help?

        We all do sometimes. Get help now from the Twilio SendGrid Support Team.

        Running into a coding hurdle? Lean on the wisdom of the crowd by browsing the SendGrid tag on Stack Overflow or visiting Twilio's Stack Overflow Collective.


              Thank you for your feedback!

              Please select the reason(s) for your feedback. The additional information you provide helps us improve our documentation:

              Sending your feedback...
              🎉 Thank you for your feedback!
              Something went wrong. Please try again.

              Thanks for your feedback!

              Refer us and get $10 in 3 simple steps!

              Step 1

              Get link

              Get a free personal referral link here

              Step 2

              Give $10

              Your user signs up and upgrade using link

              Step 3

              Get $10

              1,250 free SMSes
              OR 1,000 free voice mins
              OR 12,000 chats
              OR more