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[cobalt-users] OT - Spam from my domain not my IP



Hi everybody,

I just got an email from an angry postmaster about receiving spam from my
main domain.
Checking the spam message I realized that one of the mail's lines says :

"Received: from my-domain-name.com ([213.235.74.34])  " which is NOT my IP
nor is among this server's IPs.

What can be done to avoid this domain forgery ?

(I'm sorry if this issue is too general for this list,  more specific forums
names are welcomed)

Regards
Jorge Ceballos V

Escuela en Línea.com.mx
Aplicaciones Especiales por Internet
Plaza de la Villa de Madrid 3 - 203,
Col. Roma.
México D.F. 06700
Tels. (52+55)5207-8481 y 8709
Fax. (52+55) 5207-7941