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Some Background

  • We have an app which requires users registration
  • When a user registers, we send a confirmation email
  • The email contains a Firebase Dynamic Link to a web page and is caught by the app if it's installed
  • Since the final link contains a unique confirmation token, we generate a dynamic link each time using the Firebase dynamic link REST API
  • The generated dynamic link is something like this: https://{domain}.app.goo.gl/{randomChars}
  • The final link points to our domain, which is using HTTPS

The Problem

  • When I try to open that link in Gmail (both desktop and android), a pop-up appears that says:

Suspicious link

This link has been flagged as suspicious. Are you sure you want to proceed to {domain}.app.goo.gl?

Notes

  • It's weird that the top-level domain is from Google, and it's flagged as suspicious
  • The email contains other links, e.g. to the home page, youtube, instagram and facebook, and those open without any issue (all of them are HTTPS)
  • We're using Rackspace/Mailgun to send emails

Any insights will be really useful.

Edit:

I checked both domains ({domain}.app.goo.gl and ours) in MX Toolbox and no blacklist was found.

Armando Garza
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  • Could you share the specific URL you were seeing flagged? (If not here, please file a firebase support troubleshooting ticket and reference this stack overflow thread) – Ian Barber May 15 '18 at 22:57
  • Right now the problem automagically disappeared, I'll follow up if it happens again. – Armando Garza May 15 '18 at 23:17
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    this has happened to me today, any solutions? – Geek Guy Jan 16 '19 at 14:20
  • @GeekGuy Back then, before the issue disappeared, I was about to follow Ian's suggestion and submit a support ticket [here](https://firebase.google.com/support/) – Armando Garza Jan 16 '19 at 23:57
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    this is happening to me as well, is anybody has come up with a solution please share. – marp Jan 31 '19 at 10:14

1 Answers1

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Dynamic links now use page.link instead of app.goo.gl. The latter url has been deprecated. See https://firebase.google.com/docs/dynamic-links/create-manually

f.khantsis
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