This is an interesting idea. Have you thought of using Sieve [1] to let people manage the rules directly from their mail client? Depending on how you set this up server-side it might not be possible, or indeed useful.
As a sysadmin my initial thought is that I would rather do this myself on a mail server I control, but I can definitely see value in both a hosted and on-premise version.
EDIT: I hope you don't mind some constructive criticism on the logo. Conceptually it works very well, but there is too much whitespace. I appreciate this is a landing page, so perhaps you have something else planned already.
Intially we are thinking of a web ui to control the filtering rules though Sieve as a mail filtering language might work with some modifications like envelope sender/recipient based filtering and filtering by attachment names. I guess we have to wait and see what kind of power users would want.
Sieve/other mail server filtering implementations currently only target incoming mails, so I would be interested in knowing how you manage outgoing mail filtering if at all ?
From your emphasis on "a mailserver I control" I guess you are leaning towards the in premise version if you ever need this.
About the logo, as you guessed correctly it was a quick selection to get up and running and not the final version !
As a sysadmin my initial thought is that I would rather do this myself on a mail server I control, but I can definitely see value in both a hosted and on-premise version.
EDIT: I hope you don't mind some constructive criticism on the logo. Conceptually it works very well, but there is too much whitespace. I appreciate this is a landing page, so perhaps you have something else planned already.
[1] http://www.ietf.org/rfc/rfc3028.txt