Many people use username+sitename@example.com for email addresses so they can filter mail based on site, or spot sites that share addresses with other sites.

Here are the most common plus address portions in the gmail, mail.ru and yandex dump. I’ve omitted plus addresses that had no alphabet component, leaving a list of some potentially breached sites.

— @unsafeword


 176 xtube
 132 daz
  88 filedropper
  66 daz3d
  64 eharmony
  63 friendster
  62 savage
  57 spam
  54 bioware
  52 savage2
  51 bryce
  40 hon
  31 freebiejeebies
  27 eh
  19 policeauctions
  18 filesavr
  18 bravenet
  17 s2
  17 freebie
  16 xt
  16 fj
  15 x
  15 precyl
  14 usercash
  12 texasmonthly
  12 junk
  11 paygr
  11 comicbookdb
  11 a
  10 m
  10 kffl
  10 fd
   9 test
   9 rsbuddy
   9 itickets
   9 freebies
   9 albumhunt
   9 a
   8 pa
   8 f
   7 wholefoods
   7 v
   7 nwn
   7 j
   7 forum
   7 eharm
   6 tube
   6 tm
   6 sugardaddy
   6 reg
   6 p
   6 mcmcse
   6 m
   6 h
   6 g
   6 free
   6 d
   6 b
   5 wf
   5 toddy
   5 t
   5 s
   5 porn
   5 mmmooo
   5 games
   5 g
   5 filedrop
   5 e
   5 cafemom
   5 b
   5 audionews
   4 z
   4 xtube2
   4 x
   4 web
   4 w
   4 vika
   4 umka
   4 u
   4 topblogarea
   4 t
   4 sugar
   4 sd
   4 s
   4 p
   4 offer
   4 mythtvtalk
   4 mediamatch
   4 mcse
   4 l
   4 j
   4 fs
   4 file
   4 bw
   4 blog
   3 z28
   3 yeproc
   3 yang
   3 xtube.com
   3 w
   3 veggieboards
   3 ve
   3 tera
   3 spencer
   3 social
   3 rupid
   3 rosaura
   3 rikki
   3 register
   3 q
   3 police
   3 other
   3 ones
   3 newerth
   3 new
   3 mythtv
   3 moviemistakes
   3 mm
   3 me
   3 luther
   3 lists
   3 i
   3 i
   3 heroesofnewerth
   3 harmony
   3 game
   3 ford
   3 eusebio
   3 er
   3 ea
   3 e
   3 djdf
   3 detnews
   3 d
   3 crap
   3 coolphotoblogs
   3 com
   3 clifton
   3 c
   3 bio
   3 beta
   3 belia
   3 august
   3 auction
   3 app
   3 an
   3 3d
   2 zoomxxx
   2 zoomer
   2 z29
   2 y
   2 xtube4
   2 wl
   2 vin
   2 v8
   2 user
   2 uo
   2 ubrania
   2 u38
   2 tyresmoke
   2 tyesha
   2 trzy
   2 torba
   2 test2
   2 temp
   2 tanu
   2 sv2
   2 stuff
   2 star
   2 software
   2 snowpatrolx
   2 shop
   2 service
   2 serg
   2 sasha
   2 sar
   2 rx
   2 rus
   2 ru
   2 roundcube
   2 r
   2 pymnbyday
   2 policeauction
   2 pablo
   2 p.wtw
   2 ot
   2 orders
   2 op
   2 one
   2 on
   2 omimesiff
   2 ohteen
   2 o
   2 numbers
   2 nugsnomma
   2 nudeceleb
   2 nospam
   2 news
   2 n
   2 n
   2 mythtvtalk.com
   2 musicboat
   2 mmo
   2 mh
   2 med
   2 mcmsce
   2 man
   2 mambfraberm
   2 madonna
   2 madaline
   2 lovetta
   2 love
   2 lashanda
   2 la
   2 kimberlie
   2 k2
   2 k
   2 k
   2 jump
   2 jkmuf
   2 jenniferasma
   2 ja
   2 itickets.com
   2 ira
   2 iphone
   2 ipad
   2 gsm
   2 go
   2 gm
   2 g8m3
   2 g.
   2 fte
   2 friendster.com
   2 friend
   2 forums
   2 forumemail3
   2 forumacct
   2 foros
   2 florrie
   2 files
   2 filedropper.com
   2 ff
   2 evin
   2 eh2
   2 edrug
   2 dropper
   2 df
   2 dean
   2 dazstudio
   2 daz3d.com
   2 creation
   2 corhofdreaday
   2 comics
   2 comicdb
   2 chelseasullivan
   2 celebs
   2 cbdb
   2 cars
   2 bryce5
   2 brice
   2 boursematch
   2 boo
   2 bm
   2 berzerk
   2 benton
   2 bdfy
   2 aw
   2 avp
   2 auctions
   2 at
   2 as
   2 angel
   2 add
   2 ad
   2 acct
   2 a360e6
   2 a08
   2 a.
   2 ASH
   2 6p09zx
   2 4ng3r4ng
   2 3r
   2 20081004a
   2 1:1s
   2 .d