In order to uninstall MassMailer,
STEP 1:
Log in to your Salesforce org where the MassMailer app has been installed, go to the browser URL and replace the URL right after "....force.com/" replace the remaining URL with "/apex/Cloudrop__MassMailerUninstaller" and load the uninstaller page.
LIGHTNING:
These pictures show the lightning version.
CLASSIC:
These pictures show the classic version.
STEP 2:
Click on the 'Perform MassMailer Pre-Uninstall Actions'.
STEP 3:
Once the process in STEP 2 is over, follow the instructions below:
LIGHTNING:
Go to Salesforce Setup -> Quick find 'installed packages' -> click on 'Installed packages -> click on Uninstall link -> Follow the instructions to uninstall the MassMailer app.
![](https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/16062732546/original/aAjnqx-rCMdwFZ2Z7_f4kqtYoQOQ4kwW2w.png?1609264312)
CLASSIC:
Go to Salesforce Setup -> Quick find 'installed packages' -> click on 'Installed packages -> click on Uninstall link -> Follow the instructions to uninstall the MassMailer app.