Custom sender email addresses can only be configured by a tenant owner.
Custom sender addresses are available to all Tines customers – depending on your plan, you'll have a certain number available to use.
The default sender email address for emails sent with the email action is
https://<tenant-domain>/admin/sender_email_addresses and click the "+ Add Address" button, as shown in the top right of the below screenshot.
In this form you will need to enter:
The email address you wish to use (e.g., firstname.lastname@example.org)
The MAIL FROM domain (MAIL FROM domain must be the a subdomain of the domain using in the email address, e.g., tinesmail.example.com for example.com)
The resulting screen will provide two DNS records, a MX record and a TXT record, that will need to be configured in your DNS provider, and you will receive a verification email.
Once verification is complete, select the send email action and add the "Custom sender address" from the "+ Option" menu. You can now enter the email in the "Custom sender address" field.