gnus-button-mid-or-mail-regexp

gnus-button-mid-or-mail-regexp is a variable defined in `gnus-art.el'.
Its value is

"\\b\\(\")!;:,{}\n @]*@[a-z0-9][-.a-z0-9]+\\.\\([a-z][a-z]\\|aero\\|arpa\\|asia\\|bitnet\\|biz\\|bofh\\|cat\\|com\\|coop\\|edu\\|gov\\|info\\|int\\|jobs\\|mil\\|mobi\\|museum\\|name\\|net\\|org\\|pro\\|tel\\|travel\\|uucp\\|academy\\|actor\\|agency\\|airforce\\|archi\\|associates\\|axa\\|bar\\|bargains\\|bayern\\|beer\\|berlin\\|best\\|bid\\|bike\\|biz\\|black\\|blackfriday\\|blue\\|boutique\\|build\\|builders\\|buzz\\|cab\\|camera\\|camp\\|capital\\|cards\\|care\\|career\\|careers\\|cash\\|catering\\|center\\|ceo\\|cheap\\|christmas\\|church\\|citic\\|cleaning\\|clinic\\|clothing\\|club\\|codes\\|coffee\\|college\\|cologne\\|com\\|community\\|company\\|computer\\|construction\\|contractors\\|cooking\\|cool\\|country\\|creditcard\\|cruises\\|dance\\|dating\\|democrat\\|dental\\|desi\\|design\\|diamonds\\|directory\\|discount\\|domains\\|education\\|email\\|engineering\\|enterprises\\|equipment\\|estate\\|eus\\|events\\|exchange\\|expert\\|exposed\\|fail\\|farm\\|feedback\\|finance\\|financial\\|fish\\|fishing\\|fitness\\|flights\\|florist\\|foo\\|foundation\\|frogans\\|fund\\|furniture\\|futbol\\|gal\\|gallery\\|gift\\|glass\\|globo\\|gmo\\|gop\\|graphics\\|gratis\\|gripe\\|guide\\|guitars\\|guru\\|hamburg\\|haus\\|hiphop\\|holdings\\|holiday\\|homes\\|horse\\|house\\|immobilien\\|industries\\|info\\|ink\\|institute\\|insure\\|international\\|investments\\|jetzt\\|juegos\\|kaufen\\|kim\\|kitchen\\|kiwi\\|koeln\\|kred\\|land\\|lat\\|latino\\|lease\\|life\\|lighting\\|limited\\|limo\\|link\\|loans\\|london\\|luxe\\|luxury\\|management\\|mango\\|marketing\\|media\\|meet\\|menu\\|miami\\|moda\\|moe\\|monash\\|moscow\\|motorcycles\\|nagoya\\|name\\|net\\|neustar\\|ninja\\|nyc\\|okinawa\\|onl\\|org\\|paris\\|partners\\|parts\\|photo\\|photography\\|photos\\|pics\\|pictures\\|pink\\|plumbing\\|pro\\|productions\\|properties\\|pub\\|qpon\\|quebec\\|recipes\\|red\\|reisen\\|ren\\|rentals\\|repair\\|report\\|rest\\|reviews\\|rich\\|rocks\\|rodeo\\|ruhr\\|ryukyu\\|saarland\\|schule\\|scot\\|services\\|sexy\\|shiksha\\|shoes\\|singles\\|social\\|sohu\\|solar\\|solutions\\|soy\\|supplies\\|supply\\|support\\|surgery\\|systems\\|tattoo\\|tax\\|technology\\|tienda\\|tips\\|today\\|tokyo\\|tools\\|town\\|toys\\|trade\\|training\\|university\\|uno\\|vacations\\|vegas\\|ventures\\|viajes\\|villas\\|vision\\|vodka\\|vote\\|voting\\|voto\\|voyage\\|wang\\|watch\\|webcam\\|wed\\|wien\\|wiki\\|works\\|wtc\\|wtf\\|xyz\\|yachts\\|yokohama\\|you\\|zone\\)>?\\)\\b"


Documentation:
Regular expression that matches a message ID or a mail address.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.