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How to warm up your SMTP server to send emails?

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Are your emails ending up in the spam folder, preventing you from getting the most use of your mail marketing initiatives due to a low email delivery rate? If you’re a new SMTP server, IP, and domain, the answer is almost certainly yes. This article will teach you how to warm up an SMTP server’s IP address quickly.

It’s a nightmare if your email ends in your audience’s spam or promotion folder. Even if all technicalities, such as DKIM, SPF, and a high score on, are in place, the problem can still occur.

Warming up your new SMTP server IP is the best way to get started delivering emails in bulk, and it establishes trust and credibility with the ISPs & ESPs that distribute your emails. This whole process should be managed by the SMTP server provider for bulk email marketing

But what exactly is an SMTP server? What’s more, how would it work? Let’s start with getting to know it.

What is SMTP Server?

SMTP stands for Simple Mail Transfer Protocol, and it is used to send bulk emails for cold and warm conversion campaigns. The sending IP address for SMTP is commonly expressed as

Gmail, for example, uses the domain to send emails.

If you’re just getting started, the IP address linked with your site is likely to be new. It will lose trust with ISPs because there is no record on which they can base their decision to send your emails.

ISPs use this to protect internet users from spam and other dangerous attacks. As a result, your emails may fail to meet the requirements and be put in the spam folder.ISPs consider email volume a critical factor in determining spam; thus, starting with a low book and increasing it can help.

As a result, you begin by sending fewer emails a day and gradually increase the number. It’s referred to as “warming up.” It is the process of establishing a positive reputation with ISPs and ESPs. It also aids ISPs in analysing the activity of your recipients.

The idea is to have your emails land in the inbox instead of spam or rubbish folders. To raise the chances of sending more emails, the email sending obtains authentication and credibility.

How does SMTP work?

The SMTP protocol allows you to send an email(s) through one IP to the other while also transferring email validation to the recipient. As a result, SMTP serves as an essential gateway for sending and receiving emails.

This is how an email is sent:

  • Your email is processed by the SMTP server.
  • Selects the server from which the email will be sent.
  • And sends the message to the appropriate server.

It is downloaded by ESPs and delivered to the recipient’s mailbox.

The question arises as to whether the SMTP server functions similarly to a generic server. Yes, technically, but it just processes data to exchange messages.

Because ISPs push emails and ESPs get them, they impact where they appear in the inbox, and they can designate it as spam and send your emails there.

In today’s world, many businesses rely on email marketing to convert leads. Warming up your SMTP mail server makes it easier to send an email to your audience and convert them into customers.

How to warm-up SMTP server IP

It’s simple to warm up the SMTP server IP address, but it takes time and effort. Warm up your SMTP server IP and enhance your open mail rates by following these simple steps.

DKIM and SPF records should be set up

To begin, create DKIM and SPF records according to your requirements. DomainKeys Identified Mail (DKIM) is a standard for ensuring that emails are not tampered with. The SPF, on the other hand, defines the sending servers.

This is how the SPF records are created:

  1. Determine which mail servers your domain uses to send an email.
  2. Create a list of all the domains to which you’ll be sending emails.
  3. Make a record for your SPF.
  4. It should be added to the DNS.
  5. Check to see if everything is in working order.

This is how the DKIM records are set up:


  1. Make a domain key for your website.
  2. Incorporate the public key into the DNS entries for your domain.
  3. Established DKIM signing so that all outgoing emails have a signature.

This stage establishes the foundation for the rest of your build-up approach. Therefore, take care when building these records to ensure improved email deliverability.

Boost Your Email Sending Credibility

This stage necessitates establishing your reputation as an SMTP server email sender. The procedure, on the other hand, is simple but time-consuming.

ISPs assess reputation based on the following criteria:

  1. Rates of bouncing
  2. Traps for spam
  3. The recipient’s conduct and the quality of the content

As a result, if you wish to warm up the SMTP server IP, you must do the following:

  1. Check to see if you’re using the finest email sending techniques.
  2. Don’t use any of the words on the blacklist and avoid keyword stuffing.
  3. To keep track of your audience’s behaviour, use A/B testing.
  4. When the SMTP server is warm, do not send promotional emails.
  5. Include a signature and other ‘personal’ information in your email.
  6. Limit yourself to no more than two font styles.
  7. Refine your email sender and recipient list on a regular basis.
  8. Keep the call to action above the fold.
  9. In the sender’s email address, do not include the word ‘No-Reply.’


Getting warmed up on an SMTP server is critical for more effective brand promotion and successful email marketing campaigns by bulk email server providers. If done carefully, it shouldn’t take over 2-5 weeks to complete the normal process under SMTP server Experts

Warm up your SMTP server by following the steps outlined above, which will need you to gradually expand your email list and establish a reputation over time.

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