Mail client's configured to. Also, it establishes a history of key use in a public forum. On 25 June 2014 10:20:50 GMT+01:00, stef wrote: i noticed lots of users pgp-sign their mails to mailing-lists. what exactly is the reason/usecase/attackvector you defend against for that? what exactly is the reason for doing so on public mailing lists? and why does it make sense to sign irrelevant messages like "+1" or "just kidding" - assuming no stego usecase is in play. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.