To change the text inside a transactional e-mail, you will have to make a new e-mail template inside the Magento admin. In the following steps we will show how to do that, with the new order e-mail for guests as an example. What this e-mail looks like by default can be seen in the screenshot shown earlier. As a simple example, we will be changing the text "Thank you again for your business" to "Hope to see you again soon".
Open Magento's transactional e-mail management and add a new template.
Transactional e-mails can be added by going to System | Transactional Emails in Magento's admin. Once there, click on the Add New Template button, which is found in the top-right corner of the screen, as can be seen in the following screenshot:
Choose the proper default settings to load.
A fairly big, empty form should be shown now. Luckily, you do not have to input all the required settings for the new order e-mail manually. In the drop-down...
