Do your Emails go to the spam folder? It’s OK, don’t worry. I will show you How to Warm Up SMTP Server IP.

It is usual for emails to go to the spam folders for newbies in Email marketing using a new SMTP Mail server with a new domain and IP.

However, even if you have set all the technical components like DMARCRDNSSPFDKIMNo Blacklists, and have a 10/10 Score from Mail-Tester.com. Your email could be discarded in the spam box.

How to Warm Up SMTP Server IP – Improve Reputation and Deliverability

If you are using a new SMTP Server with a new IP Address or signing up for an SMTP Service like Amazon SES with a Reliable IP, you must warm up your IP Address before sending any Email Marketing campaigns.

Additionally, it is necessary to warm up your IP Address if you have left your IP and didn’t send an email for 30 days or more.

Thus, SMTP Warm up is an ongoing process.

If you are interested to know what are the best Email Marketing Services make sure to check them out.

Now let’s dive into How to Warm Up SMTP Server IP.

What is an IP Warm Up?

When you’re using a new server IP, this IP isn’t reliable yet on the Internet, and it is likely that the ISP (Internet Service Provider) does not know about the brand new IP. 

Learn Here What Is Email Warm Up.

Thus, IP Warm up is the process of making Your Reputation on the Internet by slowly increasing the number of emails sent using your IP address based on the predetermined timeframe.

How to Warm Up SMTP Server IP and What is an IP Warm Up?

When an Internet Service Provider detects that an email is coming from a brand new IP address, they immediately begin to analyze the traffic of that IP.  

Because ISPs take email volume as an important factor in determining whether they are spam, it’s ideal to start with small amounts of email and then make your efforts to reach more substantial volumes.

This allows email service providers the opportunity to observe and evaluate your email sending habits, and the volume and track how your recipients respond to your emails.

The general rule is that the process of warming up an IP can take between 2 to 10 weeks, depending on your situation and the number of emails you plan to send each day. 

Wait before you say that it is too boring or wanna quite read The Importance Of Email In Business – Everything You Need To Know.

How do ISPs Evaluate Your Reputation and Emails?

Once you have come to know how to Warm-Up SMTP Server IP and started the process of warming up, Internet Service Provider will evaluate your sending Reputation based on four major factors:

1. Bounce Rate

When you launch an email marketing campaign, it is important to ensure that the email list you have is valid; a high bounce rate will damage the reputation of your business.  

2. Spam traps

Actually, the least percentage of spam traps may lead to blocklist you.

3. Spammy content

The content of your email is important; ISPs will verify whether you’re using harmful keywords or blocklisted or broken links.  

4. User interaction

The way recipients interact with your emails is most important. If they report your email as spam, this will be a real issue!

How to Warm Up SMTP Server IP in Action (Examples)

OK, now that we have the overall picture of how to Warm-Up SMTP Server IP and run SMTP, Let’s look at some fundamental techniques to understand how the process works:

Note: These examples are only a guideline. Each sender will be different. As well as always be sure to validate your email lists. Learn here What is Email Validation – All You Have To Know.

1K Emails per day

It isn’t big deal; you begin to send 20 emails on the first day and then gradually increase until you reach 1K within 7-10 days.

I have described the schedule in detail in the following table:

Warmup DayEmails To Send
120
250
3100
4300
5500
6700
7900
81,000
1K Emails per day Example

10K Emails Per Day

In this case, we’ll do the same thing, however, with a longer time frame.

Look at the chart below:

Warmup Day Emails To Send
120
250
3100
4300
5800
61,200
71,800
82,200
93,500
105,000
116,500
127,500
139,000
1410,000
10K Emails per day Example

50K Emails Per Day

Currently, 50K emails per day are considered to be a big number.

We suggest that to make the process easier, and always divide large Volumes of Warm-ups into small groups, as in our case, we scheduled it into three parts:

  1. 10K emails.
  2. 30K emails.
  3. 50K emails.

It is possible to say that this would delay the Warm up time; however, I have found that in this way, you can track and manage your Warm up campaigns with ease and achieve more effective outcomes.

In other words, If you were warming up to 10K, the number of emails may be less, and you could be able to monitor and observe the interaction with users and bounce rate for a lesser amount of emails. This will assist in making things more transparent.

I hope It was clear and you all got the point.

Email Volume and Timeline

The Warm-up timetable and sending volume differ between all senders in IP Warm up.

How many emails you send will depend on the total volume of emails. Some people might require 100 emails per day, while others might need to send 1 million emails per day.

In any event, you should send your emails with sufficient frequency to ensure that you can monitor your email reputation.

Email Volume and Timeline

Note: Additionally, you must be aware of something very important. The majority of reputation systems keep information for 30 days.

Therefore, you shouldn’t miss sending emails from that IP in these 30 days. If you do so, you’ll have to Warm up once again.

That’s the reason I said IP Warm up is a continual procedure.

Marketing VS Transaction Emails

Transactional Email

If you would like to use the SMTP mail server for sending transactional emails Like: (invoices, welcome emails, Password resets) in this scenario, you could be either a brand new business or an established one.

New businesses

Usually, your company’s organic growth will produce an ideal rise in its own way.

Since transactional email is typically determined by the number of customers you have, the expansion of your client base will produce a lovely smooth growth curve for the volume of emails you send.

So, in this case, you don’t have to stress about warming up. However, it’s still vital to keep an eye on your reputation as well as your system to assess how it’s doing.

Established businesses

If you send lots of emails, and you choose to move to an ESP to start with a dedicated IP or create your SMTP, you have to migrate to a small amount in one time.

One way to accomplish this is to divide your traffic and move small sections of that traffic over to the new IP as time passes.

Alternately, if you already manage more than one mail server, you may change your servers to the new IP address each at a time.

Email Marketing Campaigns

The simplest method is to calculate your monthly email volume and then divide this number into 30 days.

Then, you should try to divide your emails equally over the 30 days.

For instance, If you want to send 60,000 emails per month, you must begin with a daily rate of 2,000 over the first month and later.

Maintain Warm Up across All ISPs

It is important to keep in mind that you need to maintain a constant volume throughout your whole Warm up time for every ISP.

Make sure to divide your Warm-up schedule so that each ISP receives the same amount of mail every day. Don’t begin to warm up the Gmail on Tuesday, Yahoo on Monday, etc. 

Maintain Warm-Up across All ISP's

Equally, divide your email among each ISP during each day of warmup. If you don’t, your activity appears to be irregular, and you’ll not be able to establish a good reputation.

Note: Mix all ISPs, don’t just send to only one at each time.

Tips For How to Warm Up SMTP Server IP

The following Tips are essential guidelines you must follow while warming up IP:

Tips For IP Warm Up
  1. Don’t begin until you’ve achieved the highest Sending Score: This can be achieved with the help of rDNS, DKIM, SPF, and other technical information.
  2. Never send promotional emails during the initial warmup stage. If you want the best percentage of engagement, so you should send transactional emails or perhaps valuable information.
  3. In the beginning, send only to the subscribers who are active. Make sure you have the minimum bounce rates.
  4. Don’t change IPs or rotate them during warmup. Rotation could be a sign that you are spamming.
  5. Put an easy link within your email messages that allow recipients to unsubscribe.
  6. The addition of an email signature will make your email look trustworthy.
  7. Merge your Email campaign with the best SMTP services. This can improve the user experience and a better reputation for your domain.
  8. Join News Letters. This will allow a number of emails to appear in your inbox and improve your service reputation.
  9. Send it to your friend’s list and request to mark your email as non-spam and ask for their reply.
  10. Make every effort to establish an audience and then warm up to the audience. This way, you’ll get the highest level of interaction from your users and facilitate the “warming up procedure” a lot simpler.
  11. Be sure to monitor your campaigns in detail, and maintain a bounce rate of less than 2% by validating your email lists.

How to Warm Up SMTP Server IP – Monitor IP Reputation

You will have to track your Bounce rate, reputation scores, and user feedback.  

Some services like Sparkpost and Amazon SES include a reputation system that displays your User Interaction and Bounce Rate.  

How to Monitor IP Reputation?

If you’re using your own SMTP or any other SMTP server. In that case, you’ll be able to track user feedback and bounce rates through Email Marketing applications like MailWizz.

You can also track open rates and unsubscribe. This gives you an insight into the way users interact with your emails.

Monitor Reputation

The right tools to assess your IP reputation are the first step to success. These are some tools and resources that you can use:

Monitor Reputation

Senderscore.org 

The score is ranked between 0 and 100, and it will show you how is your performance. Typically it’s suggested that you keep your score at 90 or higher as a sender.

Senderbase.com

It will tell you how every network provider Cisco manages views your reputation, and the rating of their reputation is based on Poor, Neutral and Good.

Postmaster.live.com

Microsoft’s Smart Network Data Service gives you information about the traffic coming through your Internet Protocol, like the number of emails sent, the spam traps, and complaint rates hits.   

Postmaster.google.com

It Provides access to the information for your domains in the Google Search Console.

Postmaster.aol.com 

Review your IP’s reputation and rate your IP’s reputation in the categories of “good,” “neutral,” or “bad.”

Conclusion – How to Warm Up SMTP Server IP

IP warmup refers to sending emails slowly to establish a positive reputation and get the email to land in the recipients’ inboxes. Be careful, and follow the tips and guidelines I mentioned above to get the most effective results.

Also Read: 11 Skills That Every Email Marketer Needs To Succeed

If you want to ask any questions or clarifications, do not hesitate to post comments.

Good Luck!