Since "/etc/mail/access" is a database, after creating the text file, use makemap to create the database map.
# makemap hash /etc/mail/access.db < /etc/mail/access
Below is example access file
# by default we allow relaying from localhost...
localhost.localdomain RELAY
localhost RELAY
127.0.0.1 RELAY
# accept mail from PayPal
paypal.com OK
# Reject Mail
posterclub@e.allposters.com REJECT
posterclub@email.allposters.com REJECT
plastmarket.com REJECT
jr@jrtr.org REJECT
7b2.606@fe01.atl2.webusenet.com REJECT
mysoldpad.com REJECT
# Discard Mail
1and1-private-registration.com DISCARD
# forum admin mails:
fictionaluser@gmail.com DISCARD
# Reject full mailbox
fictionaluser@linuxweblog.com ERROR:4.2.2:450 mailbox full
fictionaluser@linuxweblog.net REJECT
# Blacklist recipients
linuxweblog.net ERROR:550 That host does not accept mail
# Spam friend domains: exempt domains from dnsbl list checking
Spam:linuxweblog.org FRIEND
# Spam friend users: exempt email users from dnsbl list checking
# example:
# Spam:user@domain.tld FRIEND
# clients
Spam:fictionalclient@hotmail.com FRIEND
Free, facebook, tips, Links, blogging, Downloads, Google, facebookTips, money, news, apps, Social, Media, Website, Tricks, games, Android, software, PIctures, Internet, Security, Web, codes, Review, bloggers, SAMSUNG, Worldwide, Contest, Exitic, Phones, facebookTricks, hacking, London, Olympics, SEO, Youtube, iOS, Adsense, gadgets, iPHONE, widgets, Doodle, twitter, video, Deals, technology, Aircel, Airtel, iPAD, Angry, Birds, BSNL, TechLife, GMAIL, Idea, Microsoft, SmartPhones, Stress, Buster, Windows, Yahoo, Infolinks, Nokia, Scam, Uninor, browsers, Amazon, Euro, CUP, Chat, IDM, JOBS, Modem, Music, Reliance, Results, SSC, Tata, Docomo, bing, freebie, mobile, placements, AIEEE, AlertPay, Chrome, College, Competetive, Exam, Dehradun, Extension, FireFox, GPRS, HTC, IMPACT, Info, MTS, Mark, Zukerberg, Paypal, Promotional, Post, Torrent, UTU, Unlocking, VodaFone, Wall, Paper, apple, books, engineering, iCAR, iTunes, pinterest, rovio, AVG, Admit, Card, Adobe, Affiliate, Marketing, Akhilesh, Amul, Girl, BlackBerry, ChromeBook, Clixsense, Coupon, Digitallife, Discovery, Emoticons, Festival, GATE, GIMP, Income, Tax, International, JSS, JailBreaking, Kindle, Linux, Local, MAX, PAYNE, Mac, Mango, Memory, Speed, Nexus, Online, Shopping, Raakhi, Report, Rising, Stars, Sample, Science, Sony, Syllabus, TabletBooK, Teamviewer, Templates, Dark, Knight, Rises, USA, UPMT, Virgin, Xperia, ZTE, challan, counselling, course, btech, funny, iMOVE, registration
source:http://linuxpoison.blogspot.com/2008/09/1357817571538.html