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Hi there,

Whenever I try to send an email to a Lead in the activity side panel in Lightning, it throws the following error:
 
Review the errors on this page.
You can’t send an email to a lead when there’s a value in the Related To field. Remove the lead or the Related To entry.

Email messages work fine for Contacts, so this is exclusively an issue for Leads. It appears to be a validation rule of some sort, yet if it is, I cannot find the object the rule is on, so I cannot access it in order to change it.

Does anyone have any insight that would help me solve this problem? Is this expected behaviour?

Thanks!