This one is common by email servers removing form buttons for security reasons. Outlook does this too.
Unfortunately I don't know how to upload my word document that details the instructions....soooo I have converted it to an image! ha!!
Your EPDM email notification templates need to be updated to use hyperlinks instead of form buttons. I have lived with this workaround for the last 3 years and it works well.
This workaround is provided as-is.
FYI, you will need to re-run this fix any time you upgrade your EPDM installation to the next major release but I'm not sure if you have to on SP updates.
Use the Advanced Editor link when you are in the Reply dialog box to attach files.
Thanks but the problem also occurs with the text that should be a link so changing the buttons to links won't help me.
EPDM 2011 SP2