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No your spouse should not be electronically filing or mailing a return even without your consent to file jointly with them. This is true even if you were not separated.
Both individuals get to decide if they wish to file a joint return or not.
Married taxpayers may elect to file joint returns with their spouse. See IRC 6013(a).
When a spouse establishes his or her signature on a joint return was forged and there was no tacit (implied) consent to the return as filed, the joint election is invalid.
The individual claiming his or her signature was forged is not jointly or severally liable for liabilities arising from such a return if the signature was indeed forged.
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