How to decode an email attachment received as a Base64 text

1. Select the long string of text which appears in your email. That is probably one of the attachments, it usually starts like this:

   --bcaec554d754b0f76a04d9fda578--
   --bcaec554d754b0f77204d9fda57a
   Content-Type: application/pdf; name="test.pdf"
   Content-Disposition: attachment; filename="Otest.pdf"
   Content-Transfer-Encoding: base64
   X-Attachment-Id: 9ba6310dffca527f_0.1
   

2. Copy this long string and paste it in the Base64 decoder found here.

3. Download the output and rename it by adding the appropriate extension to it. For example testfile.pdf or filename.docx.

There you go. You just recreated your lost attachment using Base64 decoding.