The filter removed your email address for your protection from scammers and identity thieves who would love to contact you and pretend to be from TurboTax. Please do not post your personal information on this public website.
If you have more than one TurboTax account---and lots of users do-- then if you began a return in an account and then switched to a different one, the "old" one may be generating the email about the deadline. If you prepared and filed your return, and it was accepted by the IRS, then just ignore the emails.