[9fans] fake bounce spam - Plan9

This is a discussion on [9fans] fake bounce spam - Plan9 ; starting saturday, i've been getting an increasing amount of fake bounce spam predending to be a undelivered mail notice from MAILER-DAEMON or similar. overnight i received >500 such emails. as an emergency measure, i applied this terrible hack to smtpd: ...

+ Reply to Thread
Results 1 to 2 of 2

Thread: [9fans] fake bounce spam

  1. [9fans] fake bounce spam

    starting saturday, i've been getting an increasing amount of
    fake bounce spam predending to be a undelivered mail
    notice from MAILER-DAEMON or similar. overnight i
    received >500 such emails. as an emergency measure, i applied
    this terrible hack to smtpd:

    ; 9diff smtpd.c
    /n/sources/plan9//sys/src/cmd/upas/smtp/smtpd.c:1175,1180 - smtpd.c:1175,1184
    "recipients");
    return -1;
    }
    + if(1){
    + werrstr("rejected: /dev/null likely spam ");
    + return -1;
    + }
    return 0;
    }

    unfortunately, if i really do send mail that bounces, i won't know
    about it.

    i suppose it would be much better to accept bounces only from addresses to which
    email has been sent. though that may mean maintaining a list (per user?).

    - erik


  2. Re: [9fans] fake bounce spam

    if you don't want any spam, you'll do much better with

    chmod 0 /bin/upas/smtpd

    hope this helps.
    russ


+ Reply to Thread