* sendmail question? @ 2003-03-14 19:43 arslan saeed 2003-03-14 20:44 ` Jeff Largent 0 siblings, 1 reply; 3+ messages in thread From: arslan saeed @ 2003-03-14 19:43 UTC (permalink / raw) To: linux-admin Hi, We are running sendmail on redhat linux 7.3. When internet connectivity goes down at times, local users get smtp time-out messages (server not responding). I figured the cause of this message is that by default sendmail does initial dns lookups on all messages it recieves and in case of internet connectivity being down, it is not able to do so and produces this message. so I configured sendmail in defered delivery mode so that it should queue every message and should not do dns lookups and accept emails from local users in case of internet connectivity being down. However I figured that in defered delivery mode it does not implement anti spam configuration in access map. When I change delivery mode to defaulot background or queue-only then it looks access maps and prevents mail spamming. Is there anyway to make access maps work in deferred delivery mode. or any other configuration in which sendmail implements anti spam rules and also does not do initial dns maps so that email could be queued by sendmail even when it cannot reach internet. thanks arslan. ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: sendmail question? 2003-03-14 19:43 sendmail question? arslan saeed @ 2003-03-14 20:44 ` Jeff Largent 2003-03-17 9:10 ` Ben Clewett 0 siblings, 1 reply; 3+ messages in thread From: Jeff Largent @ 2003-03-14 20:44 UTC (permalink / raw) To: arslan saeed; +Cc: linux-admin 2 servers, one inside firewall that local users use, one outside firewall or on dmz that accepts connections from the outside. arslan saeed wrote: > Hi, > > We are running sendmail on redhat linux 7.3. When internet connectivity goes > down at times, local users get smtp time-out messages (server not > responding). I figured the cause of this message is that by default sendmail > does initial dns lookups on all messages it recieves and in case of internet > connectivity being down, it is not able to do so and produces this message. > > so I configured sendmail in defered delivery mode so that it should queue > every message and should not do dns lookups and accept emails from local > users in case of internet connectivity being down. > > However I figured that in defered delivery mode it does not implement anti > spam configuration in access map. When I change delivery mode to defaulot > background or queue-only then it looks access maps and prevents mail > spamming. > > Is there anyway to make access maps work in deferred delivery mode. or any > other configuration in which sendmail implements anti spam rules and also > does not do initial dns maps so that email could be queued by sendmail even > when it cannot reach internet. > > thanks > arslan. > > - > To unsubscribe from this list: send the line "unsubscribe linux-admin" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- Jeff Largent ImageLinks, Inc. Sr System Admin Melbourne, Fl 32935 (321) 253-0011 fax: (321) 253-5559 ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: sendmail question? 2003-03-14 20:44 ` Jeff Largent @ 2003-03-17 9:10 ` Ben Clewett 0 siblings, 0 replies; 3+ messages in thread From: Ben Clewett @ 2003-03-17 9:10 UTC (permalink / raw) To: Jeff Largent; +Cc: arslan saeed, linux-admin Another option is to use two copies of Sendmail bound to differenet IP addresses, as is now possible. Each use different sendmail.cf, which will not conflict. Works well for me :) I advise using /etc/mail_int for all the .cf, .mc, .m4, alias and virt-user tables, and /etc/mail_ext for the same on the external. If your having problems with DNS, install a caching name sever (named) and edit /etc/resolve.conf to point to 127.0.0.1. This can help. But really sendmail and dns are very closelly tied together, and sendmail uses dns for a lot of activity. From validating recipient, validating email, checking for a valid MX for the destination host... Trying to run sendmail without dns is simply not a good idea. :) Best of luck. PS, the news group comp.mail.sendmail is a better place for good feedback. Ben Clewett. Jeff Largent wrote: > 2 servers, one inside firewall that local users use, one outside firewall > or on dmz that accepts connections from the outside. > > arslan saeed wrote: > >> Hi, >> >> We are running sendmail on redhat linux 7.3. When internet >> connectivity goes >> down at times, local users get smtp time-out messages (server not >> responding). I figured the cause of this message is that by default >> sendmail >> does initial dns lookups on all messages it recieves and in case of >> internet >> connectivity being down, it is not able to do so and produces this >> message. >> >> so I configured sendmail in defered delivery mode so that it should queue >> every message and should not do dns lookups and accept emails from local >> users in case of internet connectivity being down. >> >> However I figured that in defered delivery mode it does not implement >> anti >> spam configuration in access map. When I change delivery mode to defaulot >> background or queue-only then it looks access maps and prevents mail >> spamming. >> >> Is there anyway to make access maps work in deferred delivery mode. or >> any >> other configuration in which sendmail implements anti spam rules and also >> does not do initial dns maps so that email could be queued by sendmail >> even >> when it cannot reach internet. >> >> thanks >> arslan. >> >> - >> To unsubscribe from this list: send the line "unsubscribe linux-admin" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> >> > ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2003-03-17 9:10 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2003-03-14 19:43 sendmail question? arslan saeed 2003-03-14 20:44 ` Jeff Largent 2003-03-17 9:10 ` Ben Clewett
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