> Лучше бы они заставили приостановить деятельность таких ISP,
> как wanadoo.fr, france.fr, orange.fr, через которых проходит
> неимоверное кол-во спама, а админы даже не отвечают на письма.

разве кто-то запрещает на своем сервере приостановить их деятельность?

$ cat /etc/posrtfix/check_client_access.pcre

/\d+(-|\.)\d+(-|\.)\d+(-|\.)\d+.../i    REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)dsl(\d.*|-.*|)\..+\..+/i       REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)adsl(\d.*|-.*|)\..+\..+/i      REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)pppoe(\d.*|-.*|)\..+\..+/i     REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)cable(\d.*|-.*|)\..+\..+/i     REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)client(\d.*|-.*|)\..+\..+/i    REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)dialup(\d.*|-.*|)\..+\..+/i    REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)dhcp(\d.*|-.*|)\..+\..+/i      REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)dslam(\d.*|-.*|)\..+\..+/i     REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)dynamic(\d.*|-.*|)\..+\..+/i   REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)node(\d.*|-.*|)\..+\..+/i      REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)host(\d.*|-.*|)\..+\..+/i      REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)user(\d.*|-.*|)\..+\..+/i      REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)pool(\d.*|-.*|)\..+\..+/i      REJECT we aren't accept direct connection from users, please use your internet provider smtp server
/(^|-|\.)ppp(\d.*|-.*|)\..+\..+/i       REJECT we aren't accept direct connection from users, please use your internet provider smtp server

/(orange.fr)$/i                         REJECT $1 blocked as mass spam sender. please use other email provider, for example mail.google.com
/(wanadoo.fr)$/i                        REJECT $1 blocked as mass spam sender. please use other email provider, for example mail.google.com