When we "Task: Send an Email" from an account record, the account is set by default, but one must select a contact to send to. Problem is, the lookup shows contacts from other accounts, so it is easy to choose the wrong contact to send to. I looked for a way to filter these, but could not find this section in setup.
According to this post, filtering the contacts is not possible in this scenario. However, that post is nearly 3 years old and perhaps inaccurate. I'm hoping to get a second opinion and hopefully a work-around if this still a limitation in Salesforce.