Broadcast emails are a new feature you can find in the Campaign Properties > Notification Settings. The feature lets you send a Broadcast Message to campaign subscribers on the go only by sending an email. The Broadcast Email method may be used only in rare cases but it can be pretty handy in some situations. This will require you to enter your client's email in the Broadcast email field in the campaign properties. To find the Broadcast Email field, just open up the properties of the campaign that you want to set up the Broadcast Email for. Go to your campaigns list then click the Actions menu of the campaign then click Properties.
So whenever sending a broadcast, they need to use their email account that was entered in the campaign properties. And the format should be no other than the following:
type|sms, email or both
--sent to firstname.lastname@example.org
The types available would be EMAIL, SMS, and BOTH.
Both means the broadcast will be sent both via email and SMS to the campaign subscribers. You can also enter any subject for the email. It doesn't matter. What definitely matters here would be the format.
An example would be:
Then once the client sends that to email@example.com using their email account that's entered in the Broadcast email field in the campaign properties, the subscribers of the campaign will receive the message on their phones and the message would be: "Hi this is my broadcast.".