I accept all email from the domains .edu, .gov, .ca, but no longer from .org, which is now used by many spammers. I accept email from a long list of known subdomains such as gmail.com, siam.org, mathprog.org, ams.org, ieee.org, ibm.com, etc. I also accept all email from .ac.uk, .ac.be, .ac.at, .edu.tr, edu.ar, .ac.il, .edu.au, .ac.nz, .ac.jp, .ac.cn, .edu.cn, .edu.hk, .ac.kr, .edu.sg, .ac.th, .ac.in and .ac.za, which means I accept mail from all academic addresses in the UK, Belgium, Austria, Turkey, Argentina, Israel, Australia, New Zealand, Japan, China, Hong Kong, Korea, Singapore, Thailand, India and South Africa. However, other countries present more difficulties; there is a lot of spam from .de and .fr, for example, and no easy way to screen for all academic addresses in many countries. Consequently, I check for only a few academic subdomains of .de, .fr, .be, .nl, .es, .pt, .it, .se, .dk, .no, .ch, .br, .mx, etc., including some patterns such as uni-*.de and tu-*.de. I do not accept most email from .org, .com, .net, etc.
If you are not sure that your email will reach me, please use one of the following methods:
Thanks for your patience. If you want a copy of my .procmailrc file that does this filtering on a unix/linux system, send me email!