Does omitting the unsubscribe link in plain text emails affect deliverability?

Summary

While some experts debate the direct impact, the overwhelming consensus is that omitting the unsubscribe link in plain text emails *can* negatively affect deliverability. The main concern is that users unable to easily unsubscribe might mark the email as spam, directly harming sender reputation and potentially triggering spam filters. Additionally, a lack of unsubscribe in plain text can negatively affect perceptions during review by postmasters or blocklist providers. Though HTML emails are more common, some clients still prioritize plain text, making its accessibility vital. Regulatory compliance (CAN-SPAM), accessibility best practices, and the ease of implementing the link further support its inclusion. The absence of a List-Unsubscribe-Post tag will also impact deliverability. Thus, while the impact may be indirect in some cases, including an unsubscribe link in plain text emails is generally recommended as a best practice to minimize spam complaints, maintain a clean list, ensure regulatory compliance, and protect sender reputation.

Key findings

  • Spam Complaints & Deliverability: The primary concern is that users unable to easily unsubscribe are more likely to mark the email as spam, directly harming sender reputation and deliverability.
  • Plain Text Relevance: While HTML emails are more common, some clients and systems still prioritize or exclusively render plain text.
  • Sender Reputation Risk: ISPs monitor unsubscribe rates and spam complaints; omitting the link can negatively affect sender reputation.
  • Accessibility & User Experience: Ensuring an unsubscribe option is accessible in both HTML and plain text improves user experience and avoids frustration that could lead to spam reports.
  • Ease of Implementation: Including the unsubscribe link in plain text is a simple process, making the potential benefits outweigh the effort.
  • List-Unsubscribe-Post Impact: A missing List-Unsubscribe-Post tag will impact deliverability.

Key considerations

  • Audience & Email Clients: Consider the email clients and reading habits of your target audience. If a significant portion might view plain text, the unsubscribe link is even more crucial.
  • Regulatory Compliance: Ensure compliance with regulations like CAN-SPAM, which mandate a clear and conspicuous unsubscribe mechanism.
  • Proactive Monitoring: Regularly monitor spam complaint rates and sender reputation to identify and address any deliverability issues.
  • Best Practices: Following email marketing best practices, including providing easy unsubscribe options, helps maintain a healthy email program.
  • Review by Postmasters: Consider that postmasters and blocklist providers may review messages during troubleshooting, and the absence of a clear unsubscribe mechanism could be viewed negatively.

What email marketers say
7Marketer opinions

Omitting unsubscribe links in the plain text version of emails can negatively impact deliverability. Several email marketers emphasize that while not always visible, some email clients prioritize plain text, and its absence can trigger spam filters. The missing link also harms sender reputation, as users are more likely to mark the email as spam if they cannot easily unsubscribe. Accessibility is a significant concern; ensuring all recipients, regardless of their email client, can unsubscribe is critical. Compliance with regulations like CAN-SPAM also necessitates a clear unsubscribe mechanism. In short, providing a plain text unsubscribe link is considered email marketing best practice.

Key opinions

  • Deliverability Impact: Omitting unsubscribe links from plain text emails can negatively affect deliverability.
  • Sender Reputation: Missing unsubscribe links can harm sender reputation as users may mark emails as spam.
  • Accessibility: Including unsubscribe links in both HTML and plain text ensures accessibility for all users.
  • Spam Filter Trigger: Absence of unsubscribe links can trigger spam filters due to perceived malicious intent.
  • User Experience: The absence of an unsubscribe link makes users have a negative experience.

Key considerations

  • Email Client Preference: Consider that some email clients or older systems may only render the plain text version.
  • Regulatory Compliance: Ensure compliance with regulations like CAN-SPAM, which require a clear unsubscribe mechanism.
  • List Hygiene: Providing an easy unsubscribe option helps maintain a clean email list.
  • Sender Reputation Monitoring: ISPs monitor unsubscribe rates and spam complaints, which directly affect deliverability.
  • Inclusion of link: Ensure to include unsubscribe links in both HTML and plain text versions of email marketing messages.
Marketer view

Email marketer from Reddit shares that a missing unsubscribe link in plain text can definitely hurt deliverability. Spam filters often look for it, and users are more likely to mark the email as spam if they can't find an easy way to unsubscribe.

August 2024 - Reddit
Marketer view

Email marketer from Mailjet Blog explains that while the visible unsubscribe link is crucial, neglecting the plain text version can lead to deliverability issues. Some email clients prioritize the plain text version, and its absence may trigger spam filters.

November 2023 - Mailjet Blog
Marketer view

Email marketer from Sendinblue Blog shares that omitting unsubscribe links negatively impacts sender reputation. ISPs monitor unsubscribe rates, and a missing link forces recipients to mark emails as spam, damaging deliverability.

August 2022 - Sendinblue Blog
Marketer view

Email marketer from HubSpot Blog notes that providing a clear and accessible unsubscribe link is a fundamental email marketing best practice. It helps maintain a clean email list, reduces spam complaints, and ultimately improves deliverability. The article doesn't explicitly discuss plain text, but the principle applies.

July 2023 - HubSpot Blog
Marketer view

Email marketer from Email Marketing Forum explains that from a user experience standpoint, including an unsubscribe link in both versions is vital. Some users might only see the plain text version, and if they can't unsubscribe, they'll have a negative experience and potentially mark the email as spam.

February 2022 - Email Marketing Forum
Marketer view

Email marketer from Campaign Monitor mentions that compliance with laws like CAN-SPAM requires a clear and conspicuous unsubscribe mechanism. While it doesn't directly address the plain text issue, the underlying message implies the importance of unsubscribe availability to all recipients.

March 2023 - Campaign Monitor
Marketer view

Email marketer from Litmus explains that accessibility should be considered, and that including unsubscribe links in both HTML and plain text ensures all recipients can easily opt out. A failure to include in plain text can be frustrating and lead to spam complaints.

November 2021 - Litmus

What the experts say
5Expert opinions

Experts generally agree that including an unsubscribe link in the plain text version of an email is important for several reasons. While some argue the direct impact on deliverability may be minimal since many users view HTML versions, omitting the link can lead to users marking the email as spam if they can't easily unsubscribe, thereby indirectly affecting deliverability. Furthermore, its absence could negatively affect perceptions if a postmaster or blocklist provider reviews the email. Considering its ease of implementation and the possibility of older systems rendering only the plain text, including the link is generally recommended as a best practice to avoid spam complaints and maintain sender reputation.

Key opinions

  • Indirect Deliverability Impact: Omitting the unsubscribe link may not directly affect deliverability, but can lead to spam complaints, which do impact deliverability.
  • Sender Reputation: Absence of the link can negatively affect sender reputation if users mark the email as spam.
  • Plain Text Importance: Some email clients or older systems may only render the plain text version.
  • Easy Implementation: Including the unsubscribe link in plain text is a simple task with significant potential benefits.
  • External Review: Postmasters or blocklist providers might view the absence of the link negatively during troubleshooting.

Key considerations

  • User Experience: Ensure users can easily unsubscribe to avoid frustration and spam complaints.
  • HTML vs. Plain Text: Consider whether your audience predominantly views HTML emails or if plain text is still relevant.
  • Best Practices: Adhering to email marketing best practices includes providing a clear unsubscribe option in all versions of the email.
  • List-Unsubscribe-Post: Ensure you have List-Unsubscribe-Post implemented for machine-detectable unsubscribe functionality.
  • Reputation Monitoring: Monitor your sender reputation to identify and address any deliverability issues.
Expert view

Expert from Email Geeks doubts there's a direct deliverability effect from omitting the unsubscribe link in the plain text version, but warns that users unable to easily unsubscribe might report the email as spam. He suggests considering if recipients actually view the text/plain part and can report spam effectively, guessing this is unlikely as most use HTML. He then notes that not having List-Unsubscribe-Post could have a more significant impact as it's machine-detectable.

November 2023 - Email Geeks
Expert view

Expert from spamresource.com says it’s crucial to include unsubscribe options in BOTH HTML and plain text versions of an email. They state that omitting this link in one format or another can lead to increased spam complaints and negatively affect your sender reputation, ultimately impacting deliverability.

February 2025 - spamresource.com
Expert view

Expert from Email Geeks explains that while few people might see the plain text version, its absence could negatively affect perceptions if a postmaster or blocklist provider reviews the email during troubleshooting. He suggests including it to avoid appearing like a spammer.

October 2021 - Email Geeks
Expert view

Expert from wordtothewise.com emphasizes that including an unsubscribe link in the plain text version of an email is vital, particularly as some email clients or older systems may only render the plain text version. Failure to provide this link can lead to increased spam complaints, negatively affecting deliverability.

August 2022 - wordtothewise.com
Expert view

Expert from Email Geeks simply states that including the unsubscribe link in plain text emails is trivial to implement, so there's no good reason not to.

August 2023 - Email Geeks

What the documentation says
3Technical articles

Email deliverability, according to RFC documentation and Google/Microsoft resources, hinges on minimizing spam complaints. While RFC standards emphasize the 'List-Unsubscribe' header, Google and Microsoft highlight how spam complaints directly harm deliverability to their users. Omitting unsubscribe links in plain text makes unsubscribing difficult, potentially increasing spam reports. Thus, even though plain text might seem less crucial, its lack of an unsubscribe link contributes to a higher spam complaint rate and consequently worsens deliverability.

Key findings

  • Spam Complaints Impact: High spam complaint rates negatively impact email deliverability, especially to Gmail and Microsoft users.
  • List-Unsubscribe Importance: The 'List-Unsubscribe' header facilitates one-click unsubscribe and is crucial for email deliverability.
  • Plain Text Link's Indirect Role: Omitting unsubscribe links in plain text increases the likelihood of users marking emails as spam, indirectly harming deliverability.
  • SNDS Tracking: Microsoft's Smart Network Data Services (SNDS) tracks spam complaint rates, revealing deliverability issues.

Key considerations

  • Unsubscribe Accessibility: Ensure unsubscribe options are easily accessible to all recipients, including those who might only see the plain text version.
  • Complaint Monitoring: Regularly monitor spam complaint rates to identify and address deliverability problems promptly.
  • List Hygiene: Implement strategies to maintain a clean email list and avoid sending to unengaged or uninterested recipients.
  • Header Implementation: Properly implement the 'List-Unsubscribe' header for one-click unsubscribe functionality.
Technical article

Documentation from RFC Editor specifies that while not directly related to plain text content, the 'List-Unsubscribe' header is crucial for one-click unsubscribe functionality, and its absence might indirectly affect deliverability due to increased spam complaints if users can't easily opt-out.

August 2022 - RFC Editor
Technical article

Documentation from Microsoft shares that the Smart Network Data Services (SNDS) tracks spam complaint rates. Higher rates indicate deliverability problems. The absence of an unsubscribe link in plain text versions contributes to this issue.

July 2021 - Microsoft
Technical article

Documentation from Google explains that high spam complaint rates negatively impact deliverability to Gmail users. Omitting unsubscribe links in plain text makes it harder for users to unsubscribe, potentially increasing spam complaints.

August 2024 - Google