Part of the work is the software - the rest of it is watching, tweaking, deploying and changing your filters. These aren't like light bulbs that you can turn them on and all your spam disappears magically For that sort of static source Brazilian / other snowshoe spammer Spamhaus sbl / dbl and SURBL should generally be adequate --srs
On 10-Oct-2015, at 7:28 PM, Suman Kumar Saha <suman@bdcert.org> wrote:
Now spam sender is more intelligent and they use IP with PTR and most of the cases their IP not been listed in RBLs like the header.We don’t want to let them do business with spam by taking cloud based solution like zero spam/comodo anti spam.Rather we are trying to find a open source solution that works well against spam.
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Thanks Suman
On Oct 10, 2015, at 7:11 PM, Suresh Ramasubramanian <ops.lists@gmail.com> wrote:
ip block lists are a first and still quite useful line of defense. Spam assassin is a series of score based content filters that supplement Spamhaus and such. SURBL is a URL block list.
Beyond a point however filtering has grown enormously complex (and add issues such as dmarc and other authentication) so your constituents might be better off outsourcing their mail hosting to one of several large players in this field (none that are local to Asia / saarc though)
--srs
On 10-Oct-2015, at 6:34 PM, Suman Kumar Saha <suman@bdcert.org> wrote:
RBL and even PTR record check doesn’t work well.Now spammer also use clean IP and with PTR.Mailscanner/amavis with clamav can’t protect spammers very well.
Thanks Suman
On Oct 10, 2015, at 6:59 PM, Suresh Ramasubramanian <ops.lists@gmail.com> wrote:
Spamassassin together with free and/or cheap depending on usage pattern block lists such as Spamhaus and SURBL
Mailscanner plus amavis does a sort of OK job on antivirus but that's a different ball game
--srs
On 10-Oct-2015, at 6:14 PM, Suman Kumar Saha <suman@bdcert.org> wrote:
Dear ALL, In our community mostly using mailscanner or amavis with postfix/exim as anti spam email gateway.But its perfection is not satisfactory now-a-days.Can you share which open source anti spam application works well.
Thanks Suman bdCERT