Make sure that your Mailing List only includes recipients with a valid email address, otherwise, when you try to send your email it will fail.
Workbooks enables you to identify Peopl ...
To send personalised emails use Mail Shots instead.
To create a Mailing List click Start > Marketing > Mailing List to open the Mailing Lists Landing Page, then click New Mailing List.
Enter a Name and Description for your Mailing List so it's easy to find another time.
Add the Mailing List recipients by opening the Recipients tab, clicking Add Recipients and choosing from the options displayed:
Click Save & Close. You now have a Mailing List that is available to be reused as many times as you like.
NOTE: If a Mailing List recipient wants to be unsubscribed from a specific list, you can update their subscription status on the Recipients tab by clicking on Subscribed on the appropriate row and changing the status to Unsubscribed. (You may need to activate the column called Subscription Status first.) Similarly, if the 'No Email' checkbox on a Person, Organisation or Lead record is checked, you'll see a tick in the Opted out of email column on the Recipients tab. (Again, you may need to activate this column first.)