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How to edit Custom or Visualforce Email Template content before sending email through Send an Email button

When I am selecting Custom or Visualforce email Template on Send an Email button I am not able to modify the content of the Template. It says "This email Template Content Cannot be modified"

So is this a limitation in Salesforce or I am missing some permission or something.

If its a limitation can you guys give me the Salesforce Link where it is specified 

Thank you in advance

ShirishaShirisha (Salesforce Developers) 
Hi Jack,


Do you have any IFrames included in the VF template which could cause this kind of issues as suggested in the below thread:

Please mark it as best answer if it helps you to fix the issue.

Thank you!

Shirisha Pathuri

Hi Shirisha,

Thanks for the Reply.
I am not using anything on the Vf template. Just simple one line text.

I have created Custom Template also on Custom template also I am not able to edit anything while sending