Hello >
Nowadays running a mailserver is becoming cumbersome. However in the overall picture it is better not to use a mass-mail hoster like yahoo, gmx and the like, because it allows spammers to masquerade their messages behind [EMAIL PROTECTED] addresses, which you are unlikely to block, since so much other people use them.
SPF can help with this one, if the spammer's mail from: is from yahoo.co.jp or gmail.com, or gmx.de, you can test against their spf records. (actually yahoo only have spf on its co.jp domain and gmail is ?neutral). http://oliva.9grid.es/magic/webls?dir=/soft/gdiaz/spf you can download spf.c. mkfile and a "man page". i'm testing it, but i cannot find domains with macro strings, so i tested offline as much as i could. feedback and fixes appreciated :) gabi PD: you will need to modify /sys/src/upas/smtp/smptd.c and /mail/lib/validatesender to get it running.
