Can I use the Postmark for WordPress plugin with Gravity Forms?

Gravity Forms use the wp_mail function for sending email by default, so forms built using Gravity Forms are compatible with the Postmark for WordPress plugin. They also offer a Postmark add-on within Gravity Forms that you can use instead of the Postmark for WordPress plugin.

New Gravity forms send from the WordPress admin address by default (using the merge tag  {admin_email} ), so you will need to update the From address used on your contact form notifications to be an address that has been confirmed as a sender signature on your Postmark account or is on a domain you have verified. If you need to update your WordPress admin address to be another address that you added to your Postmark account, that can be done in Settings > General within WordPress admin.

To change the From address being used for the contact form, head to Forms > Settings (on the contact form you want to use edit) > Notifications from the WordPress admin page.

You can then update the From address for the contact form notifications to be a valid address that is set up for sending with Postmark:

Use the 'Reply To' field only if you want the person filling out the contact form to be able to reply to the notification and have the reply sent to a different address than the From address.