The USPTO announced last week, at the TPAC meeting, that it will begin sending notices via email to trademark registrants about upcoming deadlines for Section 8 declarations of continued use (due between the 5th and 6th anniversary of the registration) and Section 9 renewals (due every 10 years after registration).
Since these renewals will be sent via email, trademark registrants can only receive them if they have a valid email address on file with the USPTO.
The USPTO’s formal announcement is here: USPTO to Issue Courtesy Email Reminders of Registration Maintenance Filing Deadlines
TIP: Trademark registrants who obtained a USPTO trademark registration without having counsel, it would be wise to check the TSDR records and make sure that the correspondence information lists a valid email address. If no email address is listed, Registrants can file a “Change of Correspondence Address” electronically with the USPTO to include an email address and to check the box authorizing email communications.