Am So, den 17.04.2005 schrieb Claude Jones um 16:32: > Hope this is not straying too far off subject, but you raise some thoughts. By > implication, I guess the fact that my ISP's mail servers are accepting my > forwarded sendmails is an indication that their mail servers are > mal-configured? I'm doing a fairly simple thing - I run a script every five > minutes; it starts up sendmail; it then runs a little script called gotmail > which goes out to my hotmail account and forwards, then deletes, all messages > in that account; once the hotmail actions are complete, the last command is > to stop sendmail. This generates a flood of chron-job mail messages to root > which I alias to myself, then use the .forward to send to my regular email > account where it's easy to filter and delete them automatically. While I do not fully understand what you are doing there with the script, I think you should spent some efforts to improve the script or mechanism to not produce the amount of unwanted cronjob messages. Sound like big nonsense to run a script every 5 minutes which produces a bunch of error mail messages, then to forward them to a different account where to silently delete them. Be friendly to your and your internet partner (ISP et al.) resources. > Anyway, all this by saying that the messages appear to be coming from > root@xxxxxxxxxxxxxxxxxxxxxxxx to my ISP's mail server, but that's not a > registered domain, so no possibility of reverse look-up. So, I'm assuming > that ISP's try to resolve addresses of mail that's coming in, and bounce > unresolvable addresses, as a safety practice? Do I have this all right? And > if they're not doing this, what does it mean if they are permitting mail > that's coming from unresolvable addresses.... You are correct, that not accepting mail by unresolvable domain addresses reduces spam. http://www.sendmail.org/m4/features.html --> accept_unresolvable_domains See how that feature is commented in the sendmail.mc Fedora's Sendmail is shipping with: dnl # We strongly recommend not accepting unresolvable domains if you want to dnl # protect yourself from spam. However, the laptop and users on computers dnl # that do not have 24x7 DNS do need this. dnl # dnl FEATURE(`accept_unresolvable_domains')dnl > Claude Jones Alexander -- Alexander Dalloz | Enger, Germany | GPG http://pgp.mit.edu 0xB366A773 legal statement: http://www.uni-x.org/legal.html Fedora Core 2 GNU/Linux on Athlon with kernel 2.6.11-1.14_FC2smp Serendipity 17:13:36 up 5 days, 13:54, load average: 0.36, 0.18, 0.11
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