Can I perform IP warming with single image emails?

Summary

The consensus from experts, marketers, and documentation is that using single-image emails for IP warming is generally not recommended. While technically possible if the images are expected, wanted, and resonate with the target audience, it is risky. Single-image emails often trigger spam filters, have low engagement rates, and can negatively impact sender reputation. A balanced text-to-image ratio, engaging content, and sending emails users want to receive are essential for successful IP warming. The warming emails should be similar to production emails.

Key findings

  • Spam Risk: Single-image emails often trigger spam filters and look like spam.
  • Low Engagement: Single-image emails tend to have low engagement rates.
  • Reputation Damage: Using single-image emails can negatively impact sender reputation and IP reputation.
  • Content Filters: Content-based filters can put single image emails in the spam folder.
  • Text-to-Image Balance: A balanced text-to-image ratio is essential for deliverability.
  • Quality Matters: Focus on high-quality, engaging content that users want to receive.

Key considerations

  • Content Strategy: Develop a content strategy that includes a balance of text and images.
  • Engagement Focus: Prioritize sending engaging content to encourage interaction.
  • Audience Alignment: Ensure the warming emails are aligned with the interests and expectations of the target audience.
  • Reputation Management: Actively manage your sender reputation by following best practices.
  • Consistency: Keep the style and look of warming emails similar to production emails.
  • Purposeful Content: Ensure your images and text serve a purpose and provide value to the reader.

What email marketers say
8Marketer opinions

While technically possible, performing IP warming with single-image emails is generally not recommended. Single-image emails can negatively impact sender reputation due to triggering spam filters, lacking sufficient text content, receiving low engagement, and failing to build a positive sending history. A better practice is to focus on building trust with mailbox providers by sending valuable, engaging content with a balanced text-to-image ratio. Ensure the warming content is similar in style and look to your production emails.

Key opinions

  • Spam Filters: Single-image emails often trigger spam filters due to the lack of text content.
  • Engagement: Single-image emails tend to have low engagement rates, which is detrimental to IP warming.
  • Sender Reputation: Using single-image emails can negatively impact your sender reputation.
  • Content Quality: Warming requires valuable content that users want to receive; images alone might not achieve this.
  • Similarity: Warming email content should be similar to production emails to ensure a consistent reputation.

Key considerations

  • Text-to-Image Ratio: Focus on creating emails with a balanced text-to-image ratio to avoid spam filters and improve engagement.
  • Engaging Content: Send engaging and valuable content to build trust with mailbox providers and recipients.
  • Consistency: Ensure that the content used for IP warming is similar in style and look to your regular production emails.
  • Target Audience: Consider the preferences of your target audience when designing warming email content.
  • Email Client Display: Many recipients have images turned off by default, so single-image emails may not display properly.
Marketer view

Email marketer from Email Geeks suggests considering if the warming email is similar to production emails. If you intend to add text later, consider adding it now, so the warm-up content isn’t very different from subsequent production emails.

January 2025 - Email Geeks
Marketer view

Email marketer from SendPulse Blog shares that using single image emails during IP warming can negatively impact your sender reputation because they often lack sufficient text content, are flagged as spam, and receive low engagement, thus failing to build a positive sending history.

March 2025 - SendPulse Blog
Marketer view

Email marketer from ActiveCampaign explains the importance of IP warming and how it helps to create a good reputation. They suggest sending engaging emails with a mix of text and images.

September 2023 - ActiveCampaign
Marketer view

Email marketer from Mailjet Blog explains that while technically possible, warming up an IP with single-image emails is not recommended due to spam filter triggers and low engagement rates. They recommend using a mix of text and images.

November 2023 - Mailjet Blog
Marketer view

Email marketer from Email Geeks shares that single image emails can be hard with engagement, which is needed to warm emails. Many recipients won't see the call to action because they won't load images by default, and scanners don't trust single image emails.

March 2023 - Email Geeks
Marketer view

Email marketer from Reddit user shares that warming should involve content users want to receive, images alone might not achieve that. Mix it up with valuable text.

May 2024 - Reddit
Marketer view

Email marketer from Reddit states that relying solely on image-based emails for IP warming is generally a bad practice. Focus on building trust with mailbox providers by sending valuable content with a balanced text-to-image ratio.

November 2024 - Reddit
Marketer view

Email marketer from Email Geeks explains that IP warming is about demonstrating the quality of your mail stream gradually. If the image emails are expected, wanted, and resonate with the target audience, then it's acceptable.

February 2024 - Email Geeks

What the experts say
4Expert opinions

Experts strongly advise against using single-image emails for IP warming. Such emails resemble spam, trigger spam filters, and suffer from low engagement. A positive sending reputation necessitates a balance of text and images, compelling content, and engagement with your most receptive audience to teach mail systems that your email is wanted.

Key opinions

  • Spam Likeness: Single-image emails are often perceived as spam.
  • Content Filters: Content-based filters are likely to place single image emails into the spam folder.
  • Reduced Reputation: Poor interaction with single-image emails can reduce the reputation of your sending IP.
  • Poor Engagement: Single image emails tend to have poor engagement.
  • Balanced Approach: A positive sending reputation requires a balanced approach with text and images.

Key considerations

  • Engaging Content: Send your most compelling content to engaged recipients during warming.
  • Content Balance: Use a balance of text and images to avoid triggering spam filters.
  • Audience Engagement: Focus on emails your users want to receive to build a healthy reputation.
  • Reputation Building: Teach mail systems that your email is wanted by providing relevant content.
  • Alternative Methods: Consider alternative content strategies, avoiding sole reliance on image-based emails.
Expert view

Expert from Email Geeks explains that sending emails that are a single image look like spam and have other problems. He strongly advises against sending them, especially during IP warming, as you are trying to show the machine learning system what your email content looks like.

July 2022 - Email Geeks
Expert view

Expert from Email Geeks explains that if content-based filters put the emails in the spam folder due to being an image or poor interaction, this reduces the reputation of the sending IP rather than increasing it.

June 2024 - Email Geeks
Expert view

Expert from Word to the Wise shares that image-only emails are generally not recommended, particularly during IP warming. They can trigger spam filters due to the lack of text and often have poor engagement rates. Building a positive sending reputation requires a balanced approach with text and images.

June 2022 - Word to the Wise
Expert view

Expert from Email Geeks shares that ideally, you should send your most compelling content to your most engaged recipients while warming up. You're trying to teach the system not just that "this is a source of a significant volume of email" but also "this is a source of a significant volume of email which your users want to receive". The first bit is very important at first, but the second bit is important for building a healthy reputation for the mail stream.

June 2023 - Email Geeks

What the documentation says
3Technical articles

Leading documentation sources such as SparkPost, AWS, and Google Postmaster Tools advise against using single image emails for IP warming. They emphasize the importance of sending engaging content with a balanced text-to-image ratio to avoid triggering spam filters and damaging IP reputation. Single image emails are flagged as malicious, hurting deliverability.

Key findings

  • Text-to-Image Ratio: A balanced text-to-image ratio is crucial for successful IP warming.
  • Spam Filters: Single image emails can trigger spam filters.
  • Deliverability: Single image emails can hurt email deliverability.
  • IP Reputation: Single image emails may be interpreted as malicious, harming IP address reputation.

Key considerations

  • Engaging Content: Focus on sending engaging content during IP warming.
  • Content Composition: Prioritize a good balance of text and images in your email composition.
  • Reputation Management: Actively manage your IP address reputation by adhering to best practices.
  • Alternative Methods: Explore alternatives to single-image emails to enhance deliverability.
  • Best Practices: Adhere to established email deliverability best practices.
Technical article

Documentation from AWS explains that when establishing your IP address reputation you should send emails with a good balance of text and images. Sending single image emails may be interpreted as malicious.

January 2025 - Amazon Web Services
Technical article

Documentation from SparkPost explains that during IP warming, it is important to send engaging content with a good text-to-image ratio to avoid spam filters. Single image emails can hurt deliverability and should be avoided.

August 2021 - SparkPost Documentation
Technical article

Documentation from Google Postmaster Tools shares that you should make sure to avoid sending only images as this could be detected as spam. Focus on having a good text ratio to images in your email.

June 2021 - Google