How to warm up an IP

Written by smtpcart

January 10, 2019

What does it mean to “warmup” an IP address?

New IP addresses that have never been used by senders have no sending history and need to earn their reputation with ISPs (Internet Service Providers). AOL, Yahoo!, Gmail, or Hotmail need to see that you are sending relevant, permission-based emails before they begin to allow your bulk

mailings through to inbox folders. ). When an ISP sees Email quickly coming from a new or “cold” (i.e., recently static) IP address, they will receive notice of it and instantly begin assessing the traffic coming from this source.

ISPs have complex algorithms that investigate your emails’ quality and assign a particular rating to each sending IP address. To ensure the highest deliverability and IPR (inbox placement rate), official documents released by their Postmaster Teams encourage bulk senders to increase the traffic Gradually. In the meantime, they scrutinize the number of factors that your emails generate (e.g., spam complaints, user-unknown bounces, opens, clicks)

The quantity is perhaps the most telling factor in ISP SPAM filters’ eyes. It is most suitable to start sending low to moderate volume and follow a Sending Plan to ramp up volume over time gradually. It will give the ISP’s” a possibility to strictly observe your sending practices and how your subscribers treat the emails they receive from you. Of course, just warming up IP’s is not the only key to success. It remains essential to follow all other emails best practices – send matching content that your subscribers want to read, perform list management to protect your lists’ quality, and consistently send your emails.


Follow a recommended sending plan.

Your sending reputation will determine whether your emails will get past their SPAM filters; it’s pretty essential to aim for an excellent sender reputation. It would help if you made the warmup process a priority to start on the right foot. When commencing the IP warmup process, you should follow a sending plan explicitly designed with an eye on building your sending reputation over time. The email addresses you are selecting for the implementation of the sending plan should follow these guidelines.

→ You should carefully choose the first batch you import and segment your list to select the active subscribers, i.e., open your last emails or clicking on the links. There must be no terrible addresses (non-existent

emails) on this list.

→ Route fresh leads from your site

→ Double opt-in mode Recommended!

When commencing the IP warmup process, it is always best to start sending emails to high-quality active subscribers; the best would be routing the new traffic from your websites to your new SmtpCart account (through the sign-up forms). Organic list growth is highly recommended during the warming up process as it generates more responsive and active subscribers.


How do I create my sending plan?

Since we realize that IP warmup is crucial for your ongoing bulk mailing success, we have optimized a sending schedule and highly recommend that you follow it during the first few days of mailing to subscribers.

  1. Here is a breakdown of an import batch that you should be importing daily during the first five days:
  2. → 450 Yahoo addresses
  3. → 500 Hotmail addresses
  4. → 650 AOL addresses
  5. → 1,000 other ESPs
  6. TOTAL: 2,600 Contacts
  7. Now I recommend serving the following schedule:
  8. DAY 1: Send Email to ~ 2,600 subscribers
  9. DAY 2: Send Email to ~ 5,200 subscribers
  10. DAY 3: Send Email to ~ 7,800 subscribers
  11. DAY 4: Send Email to ~ 10,400 subscribers
  12. DAY 5: Send Email to ~ 13,000 subscribers
  13. DAY 6: Send Email to ~ 20,000 subscribers
  14. DAY 7: Send Email to ~ 25,000 subscribers
  15. DAY 8: Send Email to ~ 30,000 subscribers
  16. DAY 9: Send Email to ~ 45,000 subscribers
  17. DAY 10: Send Email to~ 60,000 subscribers
  18. DAY 11: Send Email to ~ 80,000 subscribers
  19. DAY 12: Send Email to ~ 100,000 subscribers

Furthermore, we recommend throttling the number of emails evenly over the day instead of sending them all as fast as possible. You should be able to gradually expand your outbound traffic from about 1,000 emails/hour (at the outset) up to 10,000-20,000 emails/hour when the process ended. We suggest the IP warming schedule above. However, there are also alternative warming up methods that are commonly used like:

→ Traditional Strategy:

Measure your total monthly email volume and distribute that number by 30; then try to expand your sending smoothly over the first 30 days, 

For example: if you send 90,000 emails/month, you should start sending 3,000 per day over the first month.

→ Aggressive Approach:

Instead of dividing the total monthly volume by 30, distribute it by 15.

Example: say you still require to send the 90,000 email/month,

You want the emails to reach your subscribers in half as long of a time frame and send 6,000 per day for the first 15 days.

Can I skip the IP warmup process?

Your SmtpCart dedicated account is technically capable of sending the number of purchased emails from day one. The sending schedule we recommend is not obligatory yet. Based on our experience, we know that sending, e.g., 100,000 emails without building the IP reputation first frequently results in an IP block and a temporary inability to deliver any emails to a particular ISP. The IP warmup is a necessary process in today’s email marketing reality, and managing it the right way – with our ongoing assistance – can help

you reap more benefits from email marketing in both the short and long runs.

ISPs keep monthly histories of all the emails being sent to their systems. Consequently, you can anticipate accomplishing enough warmup within about 30 days. You should be able to gradually grow your outbound traffic from about 1,000 emails/hour (at the outset) up to 10,000-20,000 emails/hour when the process is finished.

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