How do public URL shorteners affect email deliverability and what are the best practices for app download links in email?

Summary

Public URL shorteners can negatively impact email deliverability due to potential spam flags and reputation damage. Experts and marketers recommend a shift towards using branded short links or custom domains for URL shortening and tracking. A custom tracking domain aligns with your brand and builds trust with ISPs, which is good for deliverability. Avoid free URL shorteners in email campaigns because they can be flagged as spam. Additionally, maintain transparency in URLs by avoiding link cloaking, which can negatively affect deliverability. Balance shortened URLs with direct links to your domain. Third party reputation should be considered. When linking to app downloads, provide a seamless and pleasant user experience, ideally by using App Links for Android and Universal Links for iOS, which involves setting up proper intent filters and associating your website with your app, or by directing users to a landing page that detects the user's device and redirects them to the appropriate app store. Deep linking directs users to specific in-app content. Monitor your link reputation and avoid bad neighborhoods.

Key findings

  • URL Shortener Impact: Public URL shorteners can harm sender reputation and trigger spam filters.
  • Branded Links Improve Trust: Using branded short links or custom domains improves trust and deliverability.
  • Link Cloaking Harmful: Link cloaking negatively affects deliverability.
  • App/Universal Links for Seamless Experience: App Links and Universal Links ensure seamless transitions to apps.
  • Deep Linking for Targeted Content: Deep linking directs users to specific in-app content.
  • Monitor Link Reputation: Links impact sender reputation; avoid bad neighborhoods.
  • Own URLs are Preferable: Third-party link trackers pose reputation risks; use your own URLs.

Key considerations

  • White-Label Option: Consider using a white-label shortener service with your own domain.
  • Alternative Link Methods: Explore non-email methods for sharing app download links, such as website links.
  • Monitor Sender Score: Monitor your sender score to assess the impact of URL shorteners.
  • Balance Shortened and Direct Links: Balance shortened URLs with direct links.
  • Ensure URL Transparency: Ensure URL transparency to build trust.
  • Implement Custom Tracking: Use a custom tracking domain to align with your brand.
  • Design Device-Specific Experiences: Design separate, pleasant experiences for mobile and desktop users.
  • Check Link Tracking Reputation: Check the reputation of third-party link tracking services.
  • Setup Intent Filters Properly: Properly set up intent filters for App Links.
  • Associate App and Website: Associate your website with your app for Universal Links and App Links.
  • Use Tools for Deep Linking: Use tools for deep link creation and management.

What email marketers say
10Marketer opinions

Public URL shorteners can negatively impact email deliverability due to potential spam flags and reputation damage. Best practices for app download links include using branded short links or custom domains for URL shortening and tracking, balancing shortened links with direct links, and avoiding link cloaking. Providing a seamless user experience with a landing page that detects the user's device and redirects them appropriately to the app store is crucial.

Key opinions

  • URL Shortener Impact: Public URL shorteners can harm sender reputation and trigger spam filters.
  • Branded Links: Using branded short links or custom domains improves trust and deliverability.
  • Link Cloaking: Link cloaking negatively affects deliverability.
  • User Experience: A device-aware landing page provides a better user experience for app downloads.

Key considerations

  • White-Label Shortener: Consider using a white-label shortener service with your own domain.
  • Alternative Links: Explore non-email methods for sharing app download links, such as a website link.
  • Sender Score: Monitor your sender score to assess the impact of URL shorteners.
  • Balance: Balance shortened URLs with direct links.
  • Transparency: Ensure URL transparency to build trust.
  • Custom Tracking: Use a custom tracking domain to align with your brand.
Marketer view

Marketer from Email Geeks suggests to be safe, the client should either use a white label shortener service with their own domain, or work out a non-email way (e.g., link to a website with the link) to communicate the link to recipients.

March 2021 - Email Geeks
Marketer view

Email marketer from Neil Patel's Blog explains that using branded short links, instead of generic ones, can improve trust and deliverability. They suggest services like Bitly offer branded options.

March 2023 - Neil Patel's Blog
Marketer view

Email marketer from Mailjet advises to avoid using free URL shorteners in email campaigns as they can be flagged as spam. They suggest using a custom domain for link shortening and tracking.

December 2024 - Mailjet
Marketer view

Email marketer from SuperOffice shares advice to brand your URLs. This can be done through the use of a tracking or link management platform, which provides an easy-to-recognise URL that adds to trustworthiness.

September 2022 - SuperOffice
Marketer view

Email marketer from Litmus explains the dangers of link cloaking, which can be perceived negatively by mailbox providers. Transparency in URLs is key for building trust and maintaining deliverability.

March 2021 - Litmus
Marketer view

Email marketer from Reddit User u/EmailGuru shares experience that using too many shortened URLs can raise suspicion with spam filters. They suggest balancing the use of shortened links with direct links to your domain.

July 2022 - Reddit
Marketer view

Email marketer from SendPulse shares that while URL shorteners can track clicks, excessive use or using untrustworthy services may harm sender reputation. They recommend monitoring sender score.

August 2021 - SendPulse
Marketer view

Marketer from Email Geeks explains that public URL shorteners like bit.ly do affect reputation.

January 2023 - Email Geeks
Marketer view

Email marketer from Stack Overflow User TechEmail responds to a question that it's beneficial to provide both direct app store links and a landing page that detects the user's device and redirects them appropriately. They emphasize providing a good user experience.

April 2024 - Stack Overflow
Marketer view

Email marketer from Gmass shares that using a custom tracking domain helps improve email deliverability because it aligns with your brand and builds trust with ISPs. They recommend setting up a subdomain for tracking purposes.

March 2024 - Gmass

What the experts say
4Expert opinions

Experts recommend designing a pleasant "get the app" experience across all devices, ideally directing users to the app store. When this isn't possible, a branded page with store links and phone number texting options is suggested. Utilizing a custom domain with URL shorteners can be beneficial. Furthermore, caution should be exercised regarding the reputation of third-party link trackers, with a preference for using your own URLs due to safety concerns associated with many URL shorteners.

Key opinions

  • User Experience: "Get the app" experience should be pleasant across devices.
  • Custom Domain Benefit: Using a custom domain with URL shorteners is recommended.
  • Reputation Risks: Third-party link trackers pose reputation risks.
  • Safety Concerns: Many URL shorteners aren't safe.

Key considerations

  • Mobile vs. Desktop: Design separate, pleasant experiences for mobile and desktop users.
  • Reputation Checks: Check the reputation of third-party link tracking services.
  • Own URLs: Prioritize using your own URLs over third-party shorteners.
Expert view

Expert from Email Geeks suggests trying to at least use a custom domain with the shortener.

April 2021 - Email Geeks
Expert view

Expert from Word to the Wise (Laura Atkins) explains that many URL shorteners aren't safe to use for various reasons. It is best to use your own URL.

September 2022 - Word to the Wise
Expert view

Expert from Email Geeks shares that any "get the app" experience should be designed to be pleasant on all devices. Send to the store if you can, but if you can't, it should be a nicely branded page with links to the stores and maybe even a chance to enter your phone number to have the link texted to your phone.

October 2022 - Email Geeks
Expert view

Expert from Spam Resource (John Levine) responds that one should be careful about third-party reputation when using link trackers. He suggests checking the reputation of the service and avoiding those with a history of spam or abuse.

October 2024 - Spam Resource

What the documentation says
5Technical articles

Technical documentation emphasizes the use of App Links (Android) and Universal Links (iOS) for seamless app transitions from emails, requiring proper intent filter setup and website-app association. Deep linking is crucial for directing users to specific in-app content. Links in emails affect sender reputation, necessitating monitoring and avoidance of links to poor-reputation sites. URLs must conform to established standards, with careful attention to character safety and thorough post-rendering testing.

Key findings

  • App/Universal Links: App Links and Universal Links ensure seamless transitions to apps.
  • Deep Linking: Deep linking directs users to specific in-app content.
  • Link Reputation: Links impact sender reputation; avoid bad neighborhoods.
  • URL Standards: URLs must conform to standards with safe characters and post-rendering testing.

Key considerations

  • Intent Filters: Properly set up intent filters for App Links.
  • Website Association: Associate your website with your app for Universal Links and App Links.
  • Deep Link Tools: Use tools for deep link creation and management.
  • Monitoring: Monitor link reputation and sender score.
  • Testing: Thoroughly test URLs after rendering.
Technical article

Documentation from SparkPost explains that links within emails contribute to your sender reputation. They advise monitoring your link reputation and avoiding links to known bad neighborhoods to ensure good deliverability.

February 2024 - SparkPost
Technical article

Documentation from Branch.io explains that deep linking can ensure users are directed to the right content within an app after clicking a link from an email. They provide tools for creating and managing deep links.

March 2022 - Branch.io
Technical article

Documentation from RFC explains how to ensure that the URLs conform to standards. Check the safety and escaping of characters in the URL, and make sure to test and ensure that the link still works as expected once rendered in an email.

September 2023 - RFC
Technical article

Documentation from Google Developers emphasizes using App Links (for Android) and Universal Links (for iOS) to create seamless transitions to your app. This involves setting up proper intent filters and associating your website with your app.

October 2023 - Google Developers
Technical article

Documentation from Apple explains that Universal Links provide a secure and seamless way to link from a website to an app. They emphasize configuring your app to handle these links correctly by associating your website domain.

March 2022 - Apple Developer Documentation