Email Activity Format
The version 2 email activity, also known as send email activity, allows you to send email messages from within your journeys. This activity type can’t be used in a custom activity.
Existing version 1 email activities remain in the legacy format and function as normal until they are edited. When a marketer edits and saves a send email activity, Journey Builder automatically upgrades the activity by mapping the data to the version 2 format.
The activity must be formatted as specified below. The following JSON object is included in the activities array of a journey, as defined in the Journey Specification.
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The email activity creates a triggered send which it uses during runtime to deliver the email message. - When a journey is unpublished, the triggered send is set to inactive.
- If the activity is republished, the triggered send is reactivated to keep reporting numbers for accurate versions.
 
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You can obtain the sender profile ID and delivery profile ID by going to Email Studio > Admin > Delivery Settings. 
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The email you configure for use with this activity must meet certain delivery standards. - Contain a Profile Center link
- Pass validations
- Contain only valid AmpScript and SSJS
- Must not contain any errors
 
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If an exception occurs while publishing the journey containing an invalid email, the errors will display in the Journey Builder UI.