Matt Rourke / AP Former Secretary of State Hillary Clinton

Hillary Clinton’s 2008 presidential campaign has rented its email list to Ready for Hillary, the super PAC laying the groundwork for a potential second attempt at the White House.

On Sunday, the group emailed the Clinton list offering free “I’m Ready for Hillary” bumper stickers, but unlike dozens of recent emails from the group offering swag, this one had the return address info@hillaryclinton.com.

Seth Bringman, a spokesman for the super PAC, told TIME on Sunday that “Ready for Hillary rented the hillaryclinton.com email list to connect with her past supporters.”

It’s not uncommon for defeated political campaigns to rent out their email lists to causes their sponsors support. Several other groups, including the President Barack Obama’s campaign and EMILY’s List, have previously rented out Clinton’s list.

Super PACs are not allowed to directly coordinate with candidates or campaigns, but because Clinton is not a declared candidate there is nothing improper about the list rental. But it is the latest indication of how seriously Clinton is considering another bid for the Oval Office. Clinton has said she will make a decision on whether to mount another campaign this year, and already a web of outside groups have formed to lay the groundwork for her if she decides to run, many with the support of top aides from the 2008 campaign and even the assistance of several top Obama operatives.

Clinton’s campaign filed a termination report with the Federal Election Commission last year after she finished paying off her 2008 campaign debts and left the State Department. It is not clear from public records who maintains control of the email list.