Send Email Notification (V3) failing for all flows

[ChristianFlick]

We have a lot of flows setup that send an email, and all of a sudden over the weekend, they are all failing. Its not a limit becuase the flows dont run over 1000 times a day, and its failing under various users, not just one.

Is anyone else experiencing issues? Error code is 429, OR it just runs for days and never times out.

[manuelstgomes]

HI @ChristianFlick 

The 429 is an error for "too many requests." What's the strategy you're using for sending the email. One call per email to Power Automate or some other way? 

I'm asking to see how we can optimize it to not run into this error.

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Cheers
Manuel

[Jay-Encodian · Accepted solution]

@ChristianFlick 

The HTTP 429 status code means 'To many requests' ... in essence your flow has failed because you must have exceeded the rate limit on the connection to the connector.

Check out https://docs.microsoft.com/en-us/connectors/sendmail/

The throttle limit is 100 API calls (100 uses) per connection in 24 hours. If you're Flows are all using the same connection... and more than 100 emails you are exceeding the limits.

I'd suggest you use the 'Office 365 Outlook' connector which allows 300 API calls per connection every 60 seconds - https://docs.microsoft.com/en-us/connectors/office365/

HTH

Jay