Custom Envelope Sender

Custom Envelope Sender Video Overview

By default, when sending an email to a ‘target’, the message will appear from the supporter. This can be problematic for email deliverability, especially with the advance of DMARC, certain providers restrict delivery using this method. To improve delivery, you can enable a custom envelope which will appear as the sender instead of the supporter.

This feature provides a way around the need to ‘spoof’ a supporter’s email address when sending from our servers, and is the preferred option to ensure optimal deliverability.

Enabling a Custom Envelope Sender

The ‘Custom Envelope Sender’ settings can be accessed under ‘Sender Settings’ within the ‘Admin’ section of your page.

If you have not used this feature before, there will of course not be any custom envelope senders in your account. Click on the ‘Manage Senders’ button to add new sender envelopes to your account.

A new sender is added by clicking

It is recommended that you do not utilize a domain that is used in general email broadcasts. For example, if the primary domain for email is, using will help protect email delivery on

In order to make sure that the domain is set up correctly for email deliverability, we perform a series of steps to validate that the domain is suitable for use as a custom envelope sender domain (see here for more regarding your domain authentication). If all the validation steps are successful, you will be able ‘Complete’ the setup. The custom envelope sender is now ready to be selected.

In this example, I have chosen the domain ‘’ to be my custom sender domain. This means that to recipients, any emails sent to a target contact will appear to come from a ‘’. If the target wishes to reply via email, and simply hits ‘Reply’ in their email client, the Reply-To address will use the actual supporters email address and the recipient will still be able to respond directly to the supporter.

Your supporters will not need to do anything differently – or even notice that this has been enabled. Responses via email will still be sent to their regular email address, but they may have a lot better chance of getting through to the intended target with their message.



Updated on November 3, 2020

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