T.M.E.P. § 304.04
Filing Date of Electronic Mail

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304.04 Filing Date of Electronic Mail

The filing date of an incoming e-mail communication is the date the communication is received in the USPTO, unless that date is a Saturday, Sunday, or Federal holiday within the District of Columbia, in which case the filing date will be the next succeeding day that is not a Saturday, Sunday, or Federal holiday within the District of Columbia. 37 C.F.R. 2.195(a)(1).

See TMEP §304.05 regarding certificates of transmission by e-mail.