How can I remove an e-mail attachment before sending?

kevi

Blacklisted
Hi, I am new to email and I don't know much about it. Yesterday When I was sending email, I attached one file with it. Later on I realized that there was no need for that file and i want to remove it but I am unable to delete it due to my lack of knowledge about email. Please let me know the same as its really urgent.
 
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