How does linking to external sites in an industry news roundup impact email deliverability?

Summary

Linking to external sites in industry news roundups has a multi-faceted impact on email deliverability. While linking to reputable sites can signal value and even improve sender reputation, poor link choices can severely damage it. A primary concern is the reputation of the linked domains, as linking to spammy, blacklisted, or compromised sites can trigger spam filters. It's also important to maintain a balanced ratio of text to links, as a disproportionate number of links can make an email appear spammy. Wrapping links in a click-through domain provides some protection, while avoiding URL shorteners is generally recommended. Finally, including original content and context around the links can improve engagement and prevent your newsletter from being viewed as low-value.

Key findings

  • Domain Reputation: The reputation of domains you link to significantly impacts your sender reputation.
  • Content Balance: Maintaining a healthy balance between original content and external links is essential.
  • Ratio of Links to Text: A high link-to-text ratio can trigger spam filters.
  • Wrapped Links: Wrapping links offers some protection, especially against reputation issues.

Key considerations

  • Link Monitoring: Regularly monitor the reputation and health of the websites you link to.
  • Original Content: Supplement external links with original commentary and context.
  • URL Shorteners: Avoid using URL shorteners.
  • Link Tracking: Ensure your link tracking domain has a good reputation.
  • HTML Link Text: Ensure that the visible text in the HTML is not the original URL
  • Trust: Quality and relevance of those links matter

What email marketers say
10Marketer opinions

Linking to external sites in industry news roundups impacts email deliverability in nuanced ways. It's not inherently detrimental, and reputable links can even improve sender reputation by signaling valuable resources. However, the quality, relevance, and quantity of those links are critical. Poor link reputation (linking to spammy or compromised sites), a high ratio of links to text, and the use of URL shorteners can all negatively affect deliverability. Ensuring links are trustworthy, relevant, and have descriptive anchor text, while also carefully using link tracking and original content, are all crucial.

Key opinions

  • Reputation Matters: The reputation of linked domains directly impacts sender reputation. Avoid linking to known spam or compromised sites.
  • Quality & Relevance: Link to trustworthy and relevant content aligned with the audience's interests.
  • Link Ratio: Be mindful of the ratio of links to text. Too many links can make the email look spammy.
  • URL Shorteners: Avoid using URL shorteners, as they are often associated with spam.
  • Content Balance: If a newsletter primarily contains external links, add original content and commentary to increase perceived value.

Key considerations

  • HTML Link Text: Ensure the visible text in the HTML is not the original link.
  • Link Tracking: Use link tracking carefully and ensure the link tracking domain has a good reputation.
  • Anchor Text: Use descriptive anchor text for links.
  • Link Health: Regularly check links to ensure they are still working and haven't been compromised.
  • B2B implications: Be extra careful when linking externally when sending B2B emails.
Marketer view

Email marketer from Sendinblue Blog answers that linking to external resources isn't inherently bad for deliverability, but the quality and relevance of those links matter. Ensure the linked content is trustworthy and aligns with your audience's interests.

November 2023 - Sendinblue Blog
Marketer view

Email marketer from Email on Acid shares the importance of using link tracking carefully. Make sure your link tracking domain has a good reputation, as this is what ISPs will see when evaluating your email's links.

October 2021 - Email on Acid
Marketer view

Email marketer from Quora explains that if your newsletter consists almost entirely of links to external sites, some email providers might see it as lower-value content. Try to include some original content and commentary to balance out the links.

November 2022 - Quora
Marketer view

Email marketer from Email Geeks shares the importance of ensuring the visible text in the HTML is not the original link, as this may cause issues, especially in B2B scenarios.

December 2021 - Email Geeks
Marketer view

Email marketer from Reddit shares that while linking to external sites isn't always bad, be mindful of the ratio of links to text. Too many links compared to text can make your email look spammy and hurt deliverability.

December 2022 - Reddit
Marketer view

Email marketer from Mailjet Blog explains that including links to reputable external websites in your emails can actually improve your sender reputation. It signals that you're providing valuable resources to your audience.

February 2025 - Mailjet Blog
Marketer view

Email marketer from GMass shares that to avoid hurting deliverability with external links, ensure the linked content is relevant to your audience, use descriptive anchor text, and check the links regularly to ensure they're still working and haven't been compromised.

May 2023 - GMass
Marketer view

Email marketer from Litmus explains that excessive linking, especially to low-reputation sites, can trigger spam filters. Focus on providing value with your content and limit the number of external links to only the most relevant and trustworthy sources.

November 2022 - Litmus
Marketer view

Email marketer from StackOverflow shares that one risk of external links is that a linked site might get compromised and start hosting malware. If your email links to a malicious site, your sender reputation could be damaged.

May 2021 - StackOverflow
Marketer view

Email marketer from Woodpecker.co explains that avoid using URL shorteners for external links, as these are often associated with spam and can negatively impact your deliverability. Use the full, original URL whenever possible.

December 2022 - Woodpecker.co

What the experts say
8Expert opinions

Linking to external sites in industry news roundups has a complex impact on email deliverability. Experts agree that the reputation of the linked domains is crucial; linking to sites with poor reputations or those blacklisted for spam can harm your sender reputation. Wrapping links in your click-through domain helps mitigate risk, but bare links are more vulnerable. Maintain a good ratio of content to links to avoid being perceived as spammy, and add original content to provide context. Also, use the article title rather than the raw domain in the visible link text. While linking to external sites is generally acceptable, constantly monitor the reputation of the sites you link to.

Key opinions

  • Link Reputation is Key: The reputation of domains you link to directly impacts your sender reputation. Linking to spam sites hurts deliverability.
  • Content to Link Ratio: A high number of links compared to content can be viewed negatively by spam filters.
  • Wrapping Links: Wrapping links in your click-through domain offers some protection against reputation issues.

Key considerations

  • Bare Links: Avoid using bare links as they are more susceptible to reputation issues.
  • Domain Reputation Monitoring: Regularly monitor the reputation of sites you link to.
  • Link Text: Use the title of the article, not the raw domain name, as the visible link text.
  • Content Context: Provide original content and context around links in newsletters.
Expert view

Expert from Email Geeks explains that if the links are wrapped in your click-through domains, it's mostly OK. If they're bare links, there's a risk that a bad reputation of those domains may hurt delivery.

December 2024 - Email Geeks
Expert view

Expert from Email Geeks says that sending to 'not our sites' should not be a problem, particularly if you're wrapping them in your domain.

November 2024 - Email Geeks
Expert view

Expert from Email Geeks suggests using the title of the article, not the domain name, as the easy answer.

November 2021 - Email Geeks
Expert view

Expert from Spam Resource explains that the reputation of the domains you link to directly influences your sender reputation. If you link to known spam sites or sites with questionable content, it can negatively impact your deliverability.

January 2024 - Spam Resource
Expert view

Expert from Email Geeks shares that link reputation applies to all domains in the message; a domain with a bad reputation can cause problems even if not actively wrapped in an HREF.

August 2022 - Email Geeks
Expert view

Expert from Email Geeks shares that you’re 99% fine but that you're going to mention a domain in the text that has a bad rep and weird stuff will happen, also to try to avoid typing out domains in the text whenever possible…especially link shorteners.

June 2021 - Email Geeks
Expert view

Expert from Word to the Wise shares that when building a newsletter with lots of outbound links, be mindful of the ratio of content to links. A newsletter that's just a list of links may be viewed unfavorably by filters. Add original content and context around those links.

December 2023 - Word to the Wise
Expert view

Expert from Spam Resource explains that when linking out, make sure the target domains are not blacklisted or have a history of spammy behavior. Regularly check the reputation of the sites you link to in your newsletters.

May 2021 - Spam Resource

What the documentation says
5Technical articles

Documentation consistently emphasizes that linking to external sites impacts email deliverability primarily through domain reputation. Linking to sites known for spam, phishing, or listed on blocklists (like Spamhaus) can significantly harm your sender reputation and lead to emails being flagged as spam. It's crucial to ensure linked domains are trustworthy and safe to avoid deliverability issues. Balancing the number of links with the overall message content is also important.

Key findings

  • Domain Reputation: A sender's domain reputation is directly influenced by the domains they link to.
  • Blacklists Impact: Linking to domains listed on blocklists (e.g., Spamhaus SBL) can cause emails to be flagged as spam.
  • SmartScreen Filter: Outlook's SmartScreen Filter checks links against reported phishing and spam sites.

Key considerations

  • Trustworthy Domains: Ensure the domains you link to are trustworthy and safe to maintain a good sender reputation.
  • Balance Links: Balance the number of links with overall message content to avoid triggering spam filters.
Technical article

Documentation from RFC explains that the message format allows for inclusion of multiple links and content, but it is important to balance the number of URLs to avoid issues with spam filters.

April 2023 - RFC 5322
Technical article

Documentation from Google explains that a sender's domain reputation is influenced by the domains they link to in their messages. Linking to domains with poor reputations can negatively impact the sender's deliverability.

November 2024 - Google Postmaster Tools
Technical article

Documentation from Spamhaus explains that if an email contains links to domains listed in the Spamhaus Block List (SBL), it can be flagged as spam, regardless of the sender's reputation.

February 2022 - Spamhaus
Technical article

Documentation from Microsoft explains that Outlook's SmartScreen Filter checks links in emails and compares them to a list of reported phishing and spam sites. Linking to sites on these lists can significantly harm your deliverability.

February 2023 - Microsoft Outlook Help
Technical article

Documentation from ReturnPath answers that the reputation of the domains you link to impacts your overall sender reputation, so it's important to ensure those domains are trustworthy and safe.

April 2022 - Validity