A custom "from address" allows you to set-up an email address as the reply email address and is visible to the email recipients for the campaign.
To set-up a custom "From Address", go to the email marketing tab > click on the create campaign link -> and last click on the Custom From Address link.
On the Custom From Address page. You will see a button called "Add Custom From" click that button and you are taken to "add custom from address" page.
On that page, enter the email address that you want to use as the from email address. You must have access to this email box. We will send a confirmation link.
Once you add a custom "from address" you will shortly receive an email to confirm the addition. You must click the link to confirm.
When confirmed, you will then have the option to use it on the "create campaign" page when creating a campaign.