It is common that the email content is encoded using Base64 encoding. This tool makes it easy to convert to and from this encoding type to help during testing of configurations.
To encode content to Base64 you enter the required message and then you press Encode to Base64 and this will then update the message to a Base64 encoded message.
Before encoding:
After encoding:
To decode the content from Base64 you enter the required encoded message and then you press Decode from Base64 and this will then update the message box to show the decode message.
Before decoding:
After decoding: