Hello,
Although you don’t need to take any action, we wanted to let you know that the following third-party apps will no longer be able to access some data in your Google Account, including your Gmail content. This change will go into effect starting March 31, 2019.
IFTTT
We are making this change as part of ongoing efforts to make sure your data is protected and private. These apps haven’t yet complied with our updated data privacy requirements announced on October 8, 2018
You can always view, manage and remove apps you’ve given access to your account by visiting your Google Account.
Thanks,
The Google Accounts team
In ~July 2018 there was some outcry because Google was "letting third parties read your emails" (e.g. https://www.cbsnews.com/news/google-reportedly-allows-third-...). Of course, these were all explicitly installed by users who gave these apps access. But somehow people were mad anyway - maybe users shouldn't be given the option to make choices they don't understand?
Anyway, as the message mentions, Google announced new requirements for these apps on October 8: https://cloud.google.com/blog/products/g-suite/elevating-use...
Apparently, IFTTT (which does personal automation, integrating with many third parties), does not comply with the new policy.