Andrew, Thanks for your advice. I have already downloaded postgrey onto my mail server but i havent yet installed it. I am just looking for a solution to deal with this spam thing coz recently one user had 11,000 + spam in their inbox! i even had to block that account temporarily. So how do you deal with spam? should I add those lines to my main.cf? If I do, will I still need to deploy Postgrey? @Kyle, I still need to get a feed back from you on this one. Thanks all of you!
On Tue, Aug 3, 2010 at 3:51 PM, andrew colin <[email protected]> wrote: > > What you decide is up to you, if you are okay with delaying legitimate mail > to "make life hard" for spammers then well go for it. > My experience how ever is you can keep spam under control without > greylisting. > > > > On Tue, Aug 3, 2010 at 2:43 PM, Bright Onapito <[email protected]>wrote: > >> Andrew, >> Are you saying that I don't need to install Postgrey? All I have to do is >> add this to which file- /etc/postfix/main.cf? Kyle, any comment on this? >> Thanks, >> Bright >> >> >> On Tue, Aug 3, 2010 at 3:37 PM, andrew colin <[email protected]>wrote: >> >>> >>> Postfix which the user has already has a built in mechanism to stop that >>> dictionary like delivery, >>> you do not need greylisting for that. >>> >>> smtpd_error_sleep_time = 5s >>> smtpd_soft_error_limit = 10 >>> smtpd_hard_error_limit = 20 >>> >>> Most spammers do not use systems under their own administration so why >>> would they care if >>> the mail queue filled up ? >>> >>> >>> On Tue, Aug 3, 2010 at 1:42 PM, Kiggundu Mukasa <[email protected]>wrote: >>> >>>> >>>> Grey listing works because its a pain in the arse of spammers >>>> I have used it and it works very well >>>> >>>> Agreed that any decent smtp implementation will resubmit >>>> BUT >>>> imagine you are trying to deliver tens of millions of messages and they >>>> are just queuing up because of retransmission >>>> >>>> On more than one of the servers I control I have seen spammers sending >>>> to every name (in alphabetical order) in the english language. >>>> so you can get >>>> >>>> [email protected] >>>> [email protected] >>>> [email protected] >>>> [email protected] >>>> etc >>>> etc >>>> etc >>>> until >>>> >>>> [email protected] >>>> >>>> Imagine they are doing that for many domains >>>> >>>> That type of spammer cannot afford to be told that for each delivery >>>> wait for 5 minutes ....they hardly ever resend. >>>> >>>> Kiggs >>>> >>>> >>>> >>>> >>>> On Aug 3, 2010, at 1:25 PM, andrew colin wrote: >>>> >>>> Greylisting is a brain dead idea any decent smtp implementation will >>>> not be detered from resubmitting, +1 for spamhaus. I say go >>>> spamassassin, kaspasky never worked for us too. Block most stuff at >>>> MTA level using RBL, reverse DNS checks, sane security signatures, >>>> then scan only stuff that got through those checks. >>>> >>>> On Tue, Aug 3, 2010 at 10:43 AM, Kyle Spencer <[email protected]> >>>> wrote: >>>> >>>> Bright, >>>> >>>> >>>> I recommend using a technique called "greylisting" combined with a >>>> zen.spamhaus.org RBL check. This will effectively kill 95-99% of your >>>> spam with no danger of false-positives. >>>> >>>> >>>> Greylisting on a Postfix system can be implemented with a package called >>>> "postgrey" and the zen.spamhaus.org RBL is a config line change or two >>>> away. >>>> >>>> >>>> Here's links to some how-to's: >>>> >>>> http://www.komaii.com/linux/postgrey-on-SuSE10.2/ >>>> >>>> and >>>> >>>> http://www.spamhaus.org/zen/ >>>> >>>> and >>>> >>>> http://wiki.debian.org/Postfix#anti-spam.3AUsingRBLLists >>>> >>>> >>>> There are probably better tutorials around since I just picked the first >>>> reasonable looking one on Google, but give it a try and let us know if you >>>> run into problems. >>>> >>>> >>>> Regards, >>>> >>>> Kyle Spencer >>>> >>>> >>>> ----- Original message ----- >>>> >>>> Hello Everyone, >>>> >>>> Is it OK to run Spam Assassin along side Kaspersky Anti Spam? How >>>> >>>> effective is Spam Assassin? My mail server is being bombarded with >>>> >>>> alot of spam. I am currently using Kaspersky Anti Spam but it seems >>>> >>>> not to be doing a good job. >>>> >>>> I use Postfix as my MTA on OpenSuSE 10.3. I need a solution, any ideas? >>>> >>>> Thanks, >>>> >>>> Bright Onapito >>>> >>>> "-If you want to see change, then be that change." >>>> >>>> _______________________________________________ >>>> >>>> LUG mailing list >>>> >>>> [email protected] >>>> >>>> http://kym.net/mailman/listinfo/lug >>>> >>>> >>>> LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ >>>> >>>> >>>> All Archives can be found at >>>> http://www.mail-archive.com/[email protected]/ >>>> >>>> >>>> The above comments and data are owned by whoever posted them (including >>>> >>>> attachments if any). The List's Host is not responsible for them in any >>>> >>>> way. --------------------------------------- >>>> >>>> >>>> >>>> _______________________________________________ >>>> >>>> LUG mailing list >>>> >>>> [email protected] >>>> >>>> http://kym.net/mailman/listinfo/lug >>>> >>>> >>>> LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ >>>> >>>> >>>> All Archives can be found at >>>> http://www.mail-archive.com/[email protected]/ >>>> >>>> >>>> The above comments and data are owned by whoever posted them (including >>>> attachments if any). The List's Host is not responsible for them in any >>>> way. >>>> >>>> --------------------------------------- >>>> >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> "Dru" >>>> To follow the path, look to the master, follow the master, walk with >>>> the master, see through the master, become the master. (zen) >>>> http://www.topdog.za.net/ >>>> http://www.baruwa.org/ >>>> _______________________________________________ >>>> LUG mailing list >>>> [email protected] >>>> http://kym.net/mailman/listinfo/lug >>>> >>>> LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ >>>> >>>> All Archives can be found at >>>> http://www.mail-archive.com/[email protected]/ >>>> >>>> The above comments and data are owned by whoever posted them (including >>>> attachments if any). The List's Host is not responsible for them in any >>>> way. >>>> --------------------------------------- >>>> >>>> >>>> >>>> Sincerely, >>>> >>>> >>>> >>>> >>>> *Kiggundu Mukasa* >>>> >>>> SERVAL LTD. >>>> Plot 80 Kanjokya Street >>>> P.O. Box 24284 Kampala, Uganda >>>> Tel: +256 772 972255 >>>> +256 414 571779 >>>> Fax: +256 312 262122 >>>> >>>> http://serval.ug >>>> >>>> >>>> >>>> _______________________________________________ >>>> LUG mailing list >>>> [email protected] >>>> http://kym.net/mailman/listinfo/lug >>>> >>>> LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ >>>> >>>> All Archives can be found at >>>> http://www.mail-archive.com/[email protected]/ >>>> >>>> The above comments and data are owned by whoever posted them (including >>>> attachments if any). The List's Host is not responsible for them in any >>>> way. >>>> --------------------------------------- >>>> >>>> >>>> >>> >>> >>> -- >>> "Dru" >>> To follow the path, look to the master, follow the master, walk with the >>> master, see through the master, become the master. (zen) >>> http://www.topdog.za.net/ >>> http://www.baruwa.org/ >>> >>> _______________________________________________ >>> LUG mailing list >>> [email protected] >>> http://kym.net/mailman/listinfo/lug >>> >>> LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ >>> >>> All Archives can be found at >>> http://www.mail-archive.com/[email protected]/ >>> >>> The above comments and data are owned by whoever posted them (including >>> attachments if any). The List's Host is not responsible for them in any way. >>> --------------------------------------- >>> >>> >>> >> >> _______________________________________________ >> LUG mailing list >> [email protected] >> http://kym.net/mailman/listinfo/lug >> >> LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ >> >> All Archives can be found at http://www.mail-archive.com/[email protected]/ >> >> The above comments and data are owned by whoever posted them (including >> attachments if any). The List's Host is not responsible for them in any way. >> --------------------------------------- >> >> >> > > > -- > "Dru" > To follow the path, look to the master, follow the master, walk with the > master, see through the master, become the master. (zen) > http://www.topdog.za.net/ > http://www.baruwa.org/ > > _______________________________________________ > LUG mailing list > [email protected] > http://kym.net/mailman/listinfo/lug > > LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ > > All Archives can be found at http://www.mail-archive.com/[email protected]/ > > The above comments and data are owned by whoever posted them (including > attachments if any). The List's Host is not responsible for them in any way. > --------------------------------------- > > >
_______________________________________________ LUG mailing list [email protected] http://kym.net/mailman/listinfo/lug LUG is generously hosted by INFOCOM http://www.infocom.co.ug/ All Archives can be found at http://www.mail-archive.com/[email protected]/ The above comments and data are owned by whoever posted them (including attachments if any). The List's Host is not responsible for them in any way. ---------------------------------------
