---
schema_version: "1"
id: 3bdd860507d43e5ba785e6439ed51cdb705cf64de650f2245934ea20b5b3b320
title: Define Properties
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_es_define_properties.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_es_define_properties.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 29fd0ef77237158f50ea680aca3779002290fde65b3bc64b09982cc71bd93216
description: Define Properties in Email Studio’s Send Flow allows you to preview the email you selected.
products:
  - Marketing
  - Marketing Cloud Engagement
release: "264"
---
# Define Properties

Define Properties in Email Studio’s Send Flow allows you to preview the email you selected.

By default, the Subject and Preheader are inherited and saved from the selected email. The addition of or edits made to the subject or preheader here only applies for this send. To update what is displayed by default, edit the email. The subject and preheader can’t be edited when Approvals is enabled. To update the field, edit the actual email. The subject and preheader of shared Content Builder emails can’t be edited.

The From Options are defaulted to the Default Commercial Send Classification for the account. However, you can select from either saved verified send classifications or use account-related From and Reply names.

The maximum length of a subject line is 200 characters and is required. A Preheader isn’t required.