Source: https://www.uspto.gov/trademarks-application-process/appealing-trademark-decisions/filing-ttab-documents-during-outage
Timestamp: 2019-04-18 21:27:25+00:00

Document:
If your deadline is today, and the document cannot be filed via the Electronic System for Trademark Trials and Appeals "ESTTA" due to an outage, you must use an alternative method of filing (explained below), if permitted, to ensure that the document is considered timely by the USPTO. Submissions filed in paper form are permitted only when ESTTA is unavailable due to technical problems, or when extraordinary circumstances are present. Users should not anticipate that the Board will extend a deadline because it was not possible to submit a filing by ESTTA on the due date.
A deadline that falls on a Saturday, Sunday, or federal holiday within the District of Columbia extends the due date to the next succeeding day that is not a Saturday, Sunday, or federal holiday. 37 C.F.R. §2.196. See TBMP § 112.
We make every effort to have ESTTA available 24 hours a day, 7 days a week. Sometimes ESTTA is unavailable for routine maintenance or is unexpectedly inaccessible. We make every effort to restore service as soon as possible.
If you experience technical difficulties with ESTTA, immediately email ESTTA@uspto.gov. If the outage is during normal business hours, between 8:30 a.m. and 5 p.m. Eastern Time, Monday through Friday, except federal holidays, please contact the Trademark Trial and Appeal Board Assistance Center at 571-272-8500.
Screen shot of any error message that you are receiving.
During an ESTTA outage, customers who cannot defer their filing must use one of the alternative methods of filing listed below, if permitted. Filing by facsimile or email is not allowed.
See TBMP § 107 for additional information on mailing documents to the TTAB.
The filing date of the document mailed is the date the document is received by the USPTO, although in certain situations, documents filed on paper through the U.S. Postal Service with a certificate of mailing as set forth below will be considered timely as of the date on the certificate. TBMP § 111.02. The filer must retain a copy of the mailed documents, including the signed and dated certificate of mailing, as proof of filing.
When mailing documents to the USPTO, if the filer wants a receipt, he or she should provide a self-addressed stamped postcard, which will be date-labeled and mailed back. The postcard should list the filer's name, the application serial number, proceeding number, or registration number, the title or a description of the document being filed, and a listing of the items submitted in the filing (motion, exhibit, fee, etc.).
The hours listed above for hand- or courier-delivery of documents to the USPTO are subject to change in the event of local emergencies or government closures affecting the USPTO. If the filer wants a receipt, he or she should provide a card that will be date-labeled and handed back to the person delivering the document. The card should list the filer's name, the application serial number, proceeding number, or registration number, the title or a description of the document being filed, and a listing of the items submitted in the filing (motion, exhibit, fee, etc.).
Please review the current fee schedule for information on TTAB fees.
Credit Cards accepted are VISA, MasterCard, Discover, and American Express. To pay by credit card when not using ESTTA, you must submit a "Credit Card Payment Form."
A title indicating the nature of the submission.
For information on the form and content of particular types of submissions, see TBMP (e.g., TBMP § 203 for requests for extension of time to oppose; TBMP § 309.02 for notices of opposition and petitions to cancel; TBMP § 502.02(a) for motions).
For additional information on TTAB submissions and signature requirements, see TBMP § 106.
For assistance with an ESTTA filing, e-mail ESTTA@uspto.gov.

References: §2
 § 112
 § 107
 § 111
 § 203
 § 309
 § 502
 § 106