SharePoint Designer workflow emails sometimes fail to send

Hi. I have had no luck following this up with support so posting to this group for visibility in the SharePoint Online team :)

I have built a SharePoint Designer workflow that sends a notification email when a new item is created on a list. Generally this works fine, but about 20% of the time I find that the email fails to send. I get this error message reported by the workflow:

The e-mail message cannot be sent. Make sure the outgoing e-mail settings for the server are configured correctly.

After some research I thought this was due to me using a SharePoint Online Group in the To field: so I changed the To field to a hard coded email address... but I still got the same problem periodically.

There is definitely something odd going on within the guts of SharePoint Online. Please can someone investigate this?

Thanks,

Myles

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