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The Business Case for D om aink ey s I d ent ified M ail Andy Spillane V ic e P r es ident, Y ah o o! M February 13, 2006 ail 1

Fighting Spam & Email Abuse R eq uir es a M ulti-fac eted Appr o ac h DomainKeys I d ent if ied M ail is p ar t of a mu l t i-f ac et ed ap p r oac h t o p r ot ec t c onsu mer s ag ainst sp am and p h ish ing sc ams. Industry collaboration efforts Cisco, S e n d m a il, P G P, A O L, I B M, a n d ot h e r s w or k e d t og e t h e r t o su b m it D K I M t o I E T F L eg islation and litig ation CA N -S P A M ; n u m e r ou s l a w su it s a g a in st sp a m m e r s f r om Y a h oo! & ot h e r s Increasing consum er aw areness Con su m e r in f or m a t ion a v a il a b l e a t h t t p : / / a n t isp a m. y a h oo. com a n d h t t p : / / se cu r it y. y a h oo. com E nh anced tech nolog ies Con t e n t f il t e r s, v ir u s p r ot e ct ion, se n d e r r e p u t a t ion, a n d a ccr e d it a t ion 2

T he State o f Email M ar k et Situatio n W o r ldw ide Estimates [R ad ic at i G r ou p ] Email T r af f ic msg s/ d ay Email Installed base mailboxes 2 0 0 6 17 1B 1. 4 B 2 0 0 9 331B 2. 2B O ri g i n al d es i g n m ak es em ai l f o rg ery & s p o o f i n g eas y f o r s p am m ers P h i s h i n g & o n l i n e i d en t i t y t h ef t are t h e m o s t eg reg i o us t yp es o f em ai l abus e 3

T he P r o lif er atio n o f P hishing Attac k s Gartner Study: Increased Phishing and Online Attacks Cause D ip in Co nsum er Co nf idence (6/05) 2. 4 2 m i l l i o n U S a d u l t s r e p o r t l o s i n g m o n e y d u e t o p h i s h i n g a t t a c k s I n 2 004 a n d 2 005, 1 1 m i l l i o n p h i s h i n g e -m a i l r e c i p i e n t s c l i c k e d o n t h e l i n k s M o r e t h a n 8 0 p e r c e n t o f o n l i n e c o n s u m e r s s a y t h a t t h e i r c o n c e r n s a b o u t o n l i n e a t t a c k s h a v e a f f e c t e d t h e i r t r u s t i n e -m a i l f r o m c o m p a n i e s o r i n d i v i d u a l s t h e y d o n t k n o w p e r s o n a l l y. F o rrester Study: Phishing Sp reads Am o ng Co nsum ers (9 /05) 1 4, 000 p h i s h i n g a t t a c k s w e r e r e p o r t e d t o t h e A n t i -P h i s h i n g W o r k i n g G r o u p f r o m A p r i l t o S e p t 2 005 A c c o r d i n g t o t h e A P W G, t h e n u m b e r o f u n i q u e k e y l o g g i n g W e b s i t e s i n c r e a s e d 1 2 5% f r o m A p r i l t o S e p t 2 005 8 6% o f p h i s h i n g a t t a c k s t a r g e t t h e f i n a n c i a l s e r v i c e s i n d u s t r y 4

W hy Y aho o! M ail is I nv o lv ed Y a h o o! M a i l i s t h e l a r g e s t w e b m a i l p r o v i d e r i n t h e U S a n d i n t h e w o r l d 6 7 M M U S m o n t h l y u n i q u e u s e r s [com S cor e M e d ia M e t r ix ] 2 3 1 M M W W m o n t h l y u n i q u e u s e r s [com S cor e M e d ia M e t r ix ] Y a h o o! p r o v i d e s e m a i l f o r : S B C / A T & T V e r i z o n B r i t i s h T e l e c o m R o g e r s C a b l e 1 0 0, 0 0 0 s o f s m a l l b u s i n e s s a n d p e r s o n a l d o m a i n s a n d m o r e 5

Send er R eputatio n B ased o n I P Ad d r ess H as P r o v en P r o blematic M a i n t e n a n c e I P a d d r e s s e s c h a n g e o v e r t i m e ; c h a n g e s a r e n c o m m u n i c a t e d ; o c c a s i o n a l l y c h a n g e s a r e n e v e n r e a l i z e d b y s e n d e r s M a i l b o x p r o v i d e r s e n d u p r e l y i n g o n e n d s e r r e p o r t s E m a i l S e r v i c e P r o v i d e r s a n d s h a r e d I P a d d r e s s e s F o r w a r d i n g 8 0 % o f f o r w a r d s t r a f f i c i s s p a m E x t r e m e l y h a r d t o d i s t i n g u i s h l e g i t i m a t e f o r w a r d e d m a i l f r o m f o r g e r i e s M a i l b o x p r o v i d e r s a r e b e t w e e n r o c k / h a r d p l a c e p r o t e c t u s e r f r o m p h i s h i n g & o t h e r f o r g e r i e s o r y i e l d f a l s e p o s i t i v e s V e r y s i g n i f i c a n t a m o u n t o f m a r k e t i n g m a i l g e t s l e g i t i m a t e l y f o r w a r d e d Y a h o o!, E a r t h L i n k, C o m c a s t, J u n o, M a i l. c o m, S B C, U s e r s d o n k n o w o r c a r e a b o u t I P a d d r e s s e s M a r k e t e r s d o n c a r e a b o u t I P a d d r e s s e s t t -u t t 6

Send er R eputatio n B ased o n D o mains D o m aink eys w as dev elo ped t o s o lv e t h es e is s u es L o w m a i n t e n a n c e f o r b o t h s e n d e r a n d m a i l b o x p r o v i d e r M a n y d o m a i n s c a n s h a r e t h e s a m e I P a d d r e s s w i t h o u t s h a r i n g t h e s a m e r e p u t a t i o n S u r v i v e s f o r w a r d i n g U s e r s k n o w a b o u t d o m a i n s C o m p a n y s d o m a i n i s ( o r s h o u l d b e ) a p r i m e b r a n d a t t r i b u t e t o m a r k e t e r s 7

K ey B enef its o f D o maink ey s M o x o v c m u r t h c o r r t r t ailb pr ider an eas e e ec epu at io n M ailb o x pr o v ider c an h elp yo u pr o t ec t yo u r b r and R edu c e s ender r epu t at io n m aint enanc e P r o t ec t em ail u s er s f r o m f o r g er y 8

I mplementatio n C o sts o f D o maink ey s C P U C o s t : S e n d m a i l s t u d y s h o w s 8-1 6 % m a i l s e r v e r s o f t w a r e C P U i n c r e a s e S e v e r a l m a j o r m a i l b o x p r o v i d e r s & s e n d e r s h a v e n o t n e e d e d t o a d d a d d i t i o n a l h a r d w a r e Sev er al r o yalt y f r ee s o f t w ar e im plem ent at io ns av ailab le E. g., h t t p : / / d o m a i n k e y s. s o u r c e f o r g e. n e t E SP s ar e b eg inning t o im plem ent D N S inf r eq u ent u pdat es r eq u ir ed 9

I mplementatio n C o sts: L ic ensing P at ent lic ens e des ig ned t o allo w f r eedo m t o o per at e, w h ile pr o t ec t ing t h e indu s t r y R o y a l t y f r e e S u b -l i c e n s a b l e P e r p e t u a l N o r e g i s t r a t i o n r e q u i r e d Alt er nat iv ely, G P L ( G N U G ener al P u b lic L ic ens e) is als o av ailab le 10

H o w Y aho o! is using D o maink ey s S i g n i n g a n d v e r i f y i n g e m a i l u s i n g D o m a i n K e y s E x p e c t t o b e g i n u s i n g D K I M a s s p e c i f i c a t i o n s t a b i l i z e s S h o w i n g p o s i t i v e v e r i f i c a t i o n r e s u l t s t o u s e r s S k i p p i n g s o m e a n t i s p a m f i l t e r s E s p e c i a l l y f o r g e r y d e t e c t i o n F i l t e r s t h a t g e t f o o l e d b y f o r w a r d i n g m o s t o f t e n N o t g u a r a n t e e d i n b o x d e l i v e r y! W o r k i n g o n p r o v i d i n g c o m p l a i n t f e e d b a c k l o o p s f o r s i g n e d m a i l C o n t i n u e d i n t e g r a t i o n i n t o s e n d e r r e p u t a t i o n s y s t e m s 11

Domains from which Yahoo! has received a DomainK ey s sig ned email 12

M o r e inf o r m at io n and s pec if ic at io n: h t t p: / / ant is pam. yah o o. c o m / do m aink eys T o o ls f o r deplo ym ent h t t p: / / do m aink eys. s o u r c ef o r g e. net 13