Re: Fetchmail/Sendmail rejects
On Sunday 15 August 2004 00:56, Malcolm Kay wrote: On Sunday 15 August 2004 04:34, you wrote: Malcolm Kay wrote: I run fetchmail in daemon mode to download POP3 mail from my ISP. Sendmail rejects many messages as for example: Aug 14 16:59:33 beta sm-mta[35000]: i7E7DYje035000: ruleset=check_mail, arg1=[EMAIL PROTECTED], relay=localhost.home [127.0.0.1], reject=451 4.1.8 Domain of sender address [EMAIL PROTECTED] does not resolve I am quite happy to have these rejected but it seems they don't get deleted at the ISP end and clog up the mail box, I think eventually confusing fetchmail. Is there some reasonable way of disposing of these messages. I would prefer not to download these into my normal user mailbox but I would be quite happy to divert them to some pseudo user setup for the purpose. I would imagine sendmail can be coaxed into doing this, but how? Responding to 2 or 3 lists using a valid e-mail address means that I receive a lot of spam including much with unresolvable addresses. have a look at mail/filtermail I've just downloaded this port and find it quite interesting. However it seems not to offer very much in this particular case as the criteria used are similar to those used by my ISP to reject mail -- I'm able to set the level. But I don't see a way of getting filtermail to reject based on domain name resolution. Others have pointed out that spam filtering in fetchmail can be used to delete mail based on the error code returned by sendmail. It seems it might also be reasonable to change sendmail.cf to issue a 553 error in place of the 451 as the 553 invoking messages are deleted by fetchmail by default. No need. Assuming you do want to reject (trash) the email you can specify multiple return codes to fetchmail. ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
On Sat, Aug 14, 2004 at 05:40:58PM +0930, Malcolm Kay wrote: I run fetchmail in daemon mode to download POP3 mail from my ISP. Sendmail rejects many messages as for example: Aug 14 16:59:33 beta sm-mta[35000]: i7E7DYje035000: ruleset=check_mail, arg1=[EMAIL PROTECTED], relay=localhost.home [127.0.0.1], reject=451 4.1.8 Domain of sender address [EMAIL PROTECTED] does not resolve I am quite happy to have these rejected but it seems they don't get deleted at the ISP end and clog up the mail box, I think eventually confusing fetchmail. Is there some reasonable way of disposing of these messages. I would prefer not to download these into my normal user mailbox but I would be quite happy to divert them to some pseudo user setup for the purpose. I would imagine sendmail can be coaxed into doing this, but how? Responding to 2 or 3 lists using a valid e-mail address means that I receive a lot of spam including much with unresolvable addresses. I would appreciate any ideas. Fetchmail (nor getmail) will do this for you. I don't know of any (other) program that allow you to do this on the client side. You can do this if you have shell access to the ISP server with procmail. Can you tell me if you have access to those files? (It doesn't make much sence going in to that rigth now.) -- Alex Articles based on solutions that I use: http://www.kruijff.org/alex/FreeBSD/ ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
Alex de Kruijff [EMAIL PROTECTED] writes: On Sat, Aug 14, 2004 at 05:40:58PM +0930, Malcolm Kay wrote: Is there some reasonable way of disposing of these messages. Fetchmail (nor getmail) will do this for you. Specifically, see the SPAM FILTERING section of the fetchmail(1) manual, and the --antispam option. Figure out what kind of error response sendmail is giving for the problem messages, and make sure fetchmail knows that it is allowed to throw those messages away. ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
On Saturday 14 August 2004 23:37, Chuck Swiger wrote: Malcolm Kay wrote: [ ... ] I am quite happy to have these rejected but it seems they don't get deleted at the ISP end and clog up the mail box, I think eventually confusing fetchmail. You ought to convince your ISP to apply better spam filtering before they accept messages for you, which will reduce the problem you see. I agree except that my ISP already provides extensive SPAM filtering. The problem is with those that don't trip the ISP's spam filter. I am able to set the spam trigger level -- maybe I should be setting this lower. But I don't believe unsolvable addresses is included in his criteria. Responding to 2 or 3 lists using a valid e-mail address means that I receive a lot of spam including much with unresolvable addresses. Nowadays, you can receive a lot of spam regardless of what you do, so it helps to reject most of it immediately. Agreed Malcolm ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
On Saturday 14 August 2004 09:10, Malcolm Kay wrote: I run fetchmail in daemon mode to download POP3 mail from my ISP. Sendmail rejects many messages as for example: Aug 14 16:59:33 beta sm-mta[35000]: i7E7DYje035000: ruleset=check_mail, arg1=[EMAIL PROTECTED], relay=localhost.home [127.0.0.1], reject=451 4.1.8 Domain of sender address [EMAIL PROTECTED] does not resolve I am quite happy to have these rejected but it seems they don't get deleted at the ISP end and clog up the mail box, I think eventually confusing fetchmail. -Z 451 on cli will have fetchmail trash all messages for which MTA returns code 451. There's an equivilent fetchmailrc option (antispam iirc). Is there some reasonable way of disposing of these messages. I would prefer not to download these into my normal user mailbox but I would be quite happy to divert them to some pseudo user setup for the purpose. I would imagine sendmail can be coaxed into doing this, but how? Responding to 2 or 3 lists using a valid e-mail address means that I receive a lot of spam including much with unresolvable addresses. I would appreciate any ideas. Malcolm ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
Malcolm Kay wrote: I run fetchmail in daemon mode to download POP3 mail from my ISP. Sendmail rejects many messages as for example: Aug 14 16:59:33 beta sm-mta[35000]: i7E7DYje035000: ruleset=check_mail, arg1=[EMAIL PROTECTED], relay=localhost.home [127.0.0.1], reject=451 4.1.8 Domain of sender address [EMAIL PROTECTED] does not resolve I am quite happy to have these rejected but it seems they don't get deleted at the ISP end and clog up the mail box, I think eventually confusing fetchmail. Is there some reasonable way of disposing of these messages. I would prefer not to download these into my normal user mailbox but I would be quite happy to divert them to some pseudo user setup for the purpose. I would imagine sendmail can be coaxed into doing this, but how? Responding to 2 or 3 lists using a valid e-mail address means that I receive a lot of spam including much with unresolvable addresses. I would appreciate any ideas. Malcolm have a look at mail/filtermail Regards, Shantanoo ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
On Sunday 15 August 2004 04:34, you wrote: Malcolm Kay wrote: I run fetchmail in daemon mode to download POP3 mail from my ISP. Sendmail rejects many messages as for example: Aug 14 16:59:33 beta sm-mta[35000]: i7E7DYje035000: ruleset=check_mail, arg1=[EMAIL PROTECTED], relay=localhost.home [127.0.0.1], reject=451 4.1.8 Domain of sender address [EMAIL PROTECTED] does not resolve I am quite happy to have these rejected but it seems they don't get deleted at the ISP end and clog up the mail box, I think eventually confusing fetchmail. Is there some reasonable way of disposing of these messages. I would prefer not to download these into my normal user mailbox but I would be quite happy to divert them to some pseudo user setup for the purpose. I would imagine sendmail can be coaxed into doing this, but how? Responding to 2 or 3 lists using a valid e-mail address means that I receive a lot of spam including much with unresolvable addresses. have a look at mail/filtermail I've just downloaded this port and find it quite interesting. However it seems not to offer very much in this particular case as the criteria used are similar to those used by my ISP to reject mail -- I'm able to set the level. But I don't see a way of getting filtermail to reject based on domain name resolution. Others have pointed out that spam filtering in fetchmail can be used to delete mail based on the error code returned by sendmail. It seems it might also be reasonable to change sendmail.cf to issue a 553 error in place of the 451 as the 553 invoking messages are deleted by fetchmail by default. Thanks for the thought and bringing an interesting port to my attention. Malcolm ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
On Sunday 15 August 2004 00:12, Lowell Gilbert wrote: Alex de Kruijff [EMAIL PROTECTED] writes: On Sat, Aug 14, 2004 at 05:40:58PM +0930, Malcolm Kay wrote: Is there some reasonable way of disposing of these messages. Fetchmail (nor getmail) will do this for you. Specifically, see the SPAM FILTERING section of the fetchmail(1) manual, and the --antispam option. Figure out what kind of error response sendmail is giving for the problem messages, and make sure fetchmail knows that it is allowed to throw those messages away. On Sunday 15 August 2004 04:15, SD wrote: -Z 451 on cli will have fetchmail trash all messages for which MTA returns code 451. There's an equivilent fetchmailrc option (antispam iirc). Thanks guys for the responses -- this really looks the way to go. Does anyone know how sendmail distinguishes between: reject=451 4.1.8 Domain of sender address does not resolve reject=553 5.1.8 .. Domain of sender address .. does not exist It seems the former is to be interpreted as a 'temporary' condition while the latter is to be interpreted as 'permanent' (and is by default deleted by fetchmail)? Thanks Malcolm ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
Malcolm Kay wrote: [ ... ] Thanks guys for the responses -- this really looks the way to go. Does anyone know how sendmail distinguishes between: reject=451 4.1.8 Domain of sender address does not resolve reject=553 5.1.8 .. Domain of sender address .. does not exist It seems the former is to be interpreted as a 'temporary' condition while the latter is to be interpreted as 'permanent' (and is by default deleted by fetchmail)? Sendmail pays attention to the return value from doing DNS queries. If sendmail receives an NXDOMAIN response, it treats that as a permanent, 5xx failure code. If sendmail gets a timeout/TRY_AGAIN, it will return a 4xx temp failure. It's not clear to me why this would matter if your ISP is the one running the mailserver: they aren't accepting the message in either case, which ought to mean that fetchmail will never see it. -- -Chuck ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
On Sunday 15 August 2004 10:40, Chuck Swiger wrote: Malcolm Kay wrote: [ ... ] Thanks guys for the responses -- this really looks the way to go. Does anyone know how sendmail distinguishes between: reject=451 4.1.8 Domain of sender address does not resolve reject=553 5.1.8 .. Domain of sender address .. does not exist It seems the former is to be interpreted as a 'temporary' condition while the latter is to be interpreted as 'permanent' (and is by default deleted by fetchmail)? Sendmail pays attention to the return value from doing DNS queries. If sendmail receives an NXDOMAIN response, it treats that as a permanent, 5xx failure code. If sendmail gets a timeout/TRY_AGAIN, it will return a 4xx temp failure. This sort of takes us back one more level -- how does the DNS service decide between responding with NXDOMAIN and a timeout/TRY_AGAIN? And does the difference have any real significance? It's not clear to me why this would matter if your ISP is the one running the mailserver: they aren't accepting the message in either case, which ought to mean that fetchmail will never see it. None of it is particularly clear to me -- but apparently my ISP's server is not rejecting these messages. If all mail servers rejected these messages it would seem to me to make the spammers endeavours rather pointless. Thanks, Malcolm ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
In the last episode (Aug 15), Malcolm Kay said: This sort of takes us back one more level -- how does the DNS service decide between responding with NXDOMAIN and a timeout/TRY_AGAIN? And does the difference have any real significance? NXDOMAIN means that a server replied this domain does not exist, and usually indicates a forged or mistyped domain. A timeout is just that. No authoritative servers replied, at all. This is usually due to misconfiguration or server failure at the domain in question, and mailers should retry the lookup later. -- Dan Nelson [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
On Sunday 15 August 2004 11:26, Malcolm Kay wrote: On Sunday 15 August 2004 10:40, Chuck Swiger wrote: Malcolm Kay wrote: [ ... ] Thanks guys for the responses -- this really looks the way to go. Does anyone know how sendmail distinguishes between: reject=451 4.1.8 Domain of sender address does not resolve reject=553 5.1.8 .. Domain of sender address .. does not exist It seems the former is to be interpreted as a 'temporary' condition while the latter is to be interpreted as 'permanent' (and is by default deleted by fetchmail)? Sendmail pays attention to the return value from doing DNS queries. If sendmail receives an NXDOMAIN response, it treats that as a permanent, 5xx failure code. If sendmail gets a timeout/TRY_AGAIN, it will return a 4xx temp failure. This sort of takes us back one more level -- how does the DNS service decide between responding with NXDOMAIN and a timeout/TRY_AGAIN? And does the difference have any real significance? It's not clear to me why this would matter if your ISP is the one running the mailserver: they aren't accepting the message in either case, which ought to mean that fetchmail will never see it. None of it is particularly clear to me -- but apparently my ISP's server is not rejecting these messages. If all mail servers rejected these messages it would seem to me to make the spammers endeavours rather pointless. Perhaps I've not made it clear that the above reject messages appear in the maillog on my local machine as a consequnce of fetchmail reposting the messages to local sendmail. Malcolm ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Fetchmail/Sendmail rejects
Malcolm Kay wrote: On Sunday 15 August 2004 10:40, Chuck Swiger wrote: [ ... ] Sendmail pays attention to the return value from doing DNS queries. If sendmail receives an NXDOMAIN response, it treats that as a permanent, 5xx failure code. If sendmail gets a timeout/TRY_AGAIN, it will return a 4xx temp failure. This sort of takes us back one more level -- how does the DNS service decide between responding with NXDOMAIN and a timeout/TRY_AGAIN? Dan provided a good answer to this. And does the difference have any real significance? The real significance is that a 5xx response means the other side should give up and never attempt to redeliver that message. A 4xx response means the other MTA will keep retrying for several days. You want to reject spam permanently, and you want to do it as close to the source as possible. Meaning, you don't want to accept the message for relaying to some other machine, then have that other machine reject the message, because then your machine becomes responsible for generating a bounce. Which then clogs up your machine when bounces for spam are not deliverable. It's not clear to me why this would matter if your ISP is the one running the mailserver: they aren't accepting the message in either case, which ought to mean that fetchmail will never see it. None of it is particularly clear to me -- but apparently my ISP's server is not rejecting these messages. You should forward the log messages you showed us to your ISP, and ask them what's going on. Their mailservers should be rejecting the messages for the same reason your mailserver does. [ Hmm, I suppose it could also indicate that you have problems with your local DNS resolver, if you are getting lots of temp failures your ISP isn't. Unlikely, though, but you could test by switching to using their nameservers if you aren't doing so already. ] If all mail servers rejected these messages it would seem to me to make the spammers endeavours rather pointless. Spammers forge mail from legitimate addresses as well, but it certainly helps to reject mail from invalid domains. -- -Chuck ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
