Hi @Sajid Ali Shah ,
Welcome to our forum!
From your description, do you mean you want to always send from a default account?
According to my test, it is feasible to hide From Field while composing a new email and send from default account, here are the steps:
- Go to Option tab, click From in Show Fileds, then From field will be hidden.
- Go to Account settings > Account Settings > choose one account and set it to the default
- Go to File > Options > Mail > Check "Always use the default account when composing new messages"
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