26 Feb

IP Warm-up Overview

IP Warm-up Definition

IP warming is the process of adding campaign volume week-over-week to a neutral IP Address to establish a good sending reputation with Internet Services Providers. (ISPs)

IP Warm-up Summary

ISPs view email from a neutral IP address as suspicious until they establish a good sending reputation. It takes 4-8 weeks to achieve maximum deliverability (depending on targeted volume and engagement). Warm-up could take longer if receivers don’t perceive an email as opt-in. Certain receivers limit senders to thresholds until they build a sender reputation.

Nextehost recommends starting off on the right foot with the cleanest data first. Focus warm-up your most engaged subscribers and then add in the older segments as you progress. Older segments should be added to the engaged segments in chunks of 15% of your existing volume as not to tip your reputation from good to bad. The goal during your warm-up process is to send to subscribers who are least likely to complain and bounce. This would include those that have opted-in most recently and are consistent openers/clickers.

During the Warm-up phase the more consistent you are with volume, frequency, complaint and bounce levels, the faster you will establish a positive sending reputation. If you send infrequently, anything less than weekly it will take more time to build a positive sender reputation.

IP Warm-up Plan

Key to Success

Week 1 Daily Volume Notes
Day 1 200 • During weeks 1-2 send to the most
Day 2 500 active subscribers. 30 days active
Day 3 1,000
Day 4 2,000
Day 5 5,000 • During weeks 3-4 send to 60 days
Day 6 10,000 active subscribers.
Day 7 20,000
Week 2
Day 8 40,000 • Do not send to subscribers that have
Day 9 100,000 note opened or clicked in the past 90 days
Day 10 250,000 during the first 45 days of warm-up.
Day 11 500,000
Day 12 1,000,000
Day 13 2,000,000 • If warming above 5 Million do not send
Day 14 5,000,000 more than double the previous volume.

What to Expect

Once you begin warming up your IPs you can expect some bulking and blocking to occur. It is key to stick with the plan. Below are details of what you can expect and actions to take.

  • Bulking at Yahoo, AOL, Gmail. Typically clears up after a few sends with solid positive metrics, but it can take time to get inbox delivery. The key is to keep sending to engaged subscribers.
  • Delays at AOL, Microsoft and Comcast. The delays (421 bounces) will retry for 72 hours and if not delivered will bounce as a 5XX with the original 421 error in the bounce record. Delays are normal, and will lessen each day as reputation develops. As long as they are ultimately delivering there is no concern. However if they are timing out in large quantities you should back down your volumes to that ISP by tightening up your engagement
  • Possible blocking by ISPs can occur if the list isn’t engaged enough. The key is to segment carefully and tighten up engagement Again the key is to keep sending.
  • It is important to monitor your metrics and adjust the plan accordingly during the Warm-up period.




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