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Questions tagged [spam-filter]

179 questions
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8 answers

Block spam by using geoip filter?

We are looking for a way to be able to block spam based on geographic location by filtering using geoip. context: we rarely have any email correspondence outside of the USA, so we would like to block all incoming email outside the US except for…
faultyserver
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2 answers

Spam passing postfix config "hostname does not resolve to address: No address associated with hostname"

On a postfix MTA MX setup, I have a spam mail pass two checks which it definitely shouldn't. The postfix/smtpd process logs these warnings, which should be a hard fail in this setup: hostname * does not resolve to address *: No address associated…
nyov
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1 answer

Postfix reverse MX check

Is there any way to configure reverse MX check for Postfix to check incoming emails? I just noticed that most of our spam which are still coming true are sent (or seems to be sent) from properly configured SMTP servers, (like yahoo's or which ever),…
Tero
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1 answer

TXT entry in DNS for both gmail and amazon ses

It seems adding a TXT entry in DNS about Google is a good practice (when using gmail to send mail) to prevent being considered as Spammer. So I could add a TXT entry in my DNS records to: example.org TXT "v=spf1 include:_spf.google.com ~all" But,…
rap-2-h
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1 answer

Is there any way to see why Outlook's client junk mail filter is marking a message as spam?

I have some users running Outlook 2007 connected to an Exchange server, and they're complaining about mail ending up in their junk box. There's no X-SCL tag in the mail headers so this filtering must be happening in Outlook itself, rather than…
sk.
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1 answer

Postfix change add-on priority

I have just started to fight with Spam mails because of my new project. I will explain structure of that system. We have Postfix as MTA on relay server and fresh Spamassasian and Policyd(v2 Cluebringer) add-ons for it. These are working well and…
itirazimvar
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1 answer

Can IP reputation be affected due to automatic forwarding?

I am hitting a dead wall with the support team of my email hosting provider. The IP they assigned me was blacklisted and so sending emails to AOL.co.uk end up getting rejected. After several emails back and forth, it has been de-listed from all…
dr_rk
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1 answer

Filter spam emails from being forwarded by exim4

I was studying and searching 2 days about how to configure my exim/spamassassin/clamd configuration. I have the next situation: I have an email a@domain.com redirected to a@gmail.com. Unfortunately, every time a@domain.com receives a spam email,…
demlasjr
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2 answers

How Reverse DNS does what it does

Hopefully this is not a stupid question, but I cannot find a clear cut answer. Can someone please inform me exactly what 'source address' is used in Reverse DNS? Does rDNS pull the IP address from the Received: portion of the header, or does it…
burmat
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2 answers

How do I allow end user 'blocked sender lists' to work even if the server manages spam filtering?

Client filtering in Outlook 2010 is disabled when the server is managing spam filtering. Unfortunately I have a few high profile users that prefer to spam-block mailing lists rather than unsubscribe, so even though the email is not really spam they…
Myrddin Emrys
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4 answers

Best practices for spam filtering

I've been running an amavisd-new, spamassassin, postfix setup for a while to help crush spam on our incoming e-mail servers. The setup I'm using is a few years old at this point and its about time to rebuild on new hardware. I was wondering if…
gnarf
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1 answer

Outgoing emails from China based VPS rejected or marked as spam

I just switched email service provider from Google apps to a VPS with a Hong Kong host. Now I find a huge part of all outgoing emails ending up in spam boxes and in some cases getting totally rejected by receiving servers. I've set up SPF records,…
oskare
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1 answer

Processing items with SpamAssassin and sa-learn

I have been working on getting SpamAssassin up and running for awhile now and am pretty close to being finished. However, there is one last thing that is grinding away at me that I can't seem to figure out. I have searched around a bit but have…
jmreicha
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2 answers

Best techniques to make sure that emails are not marked as spam

We have a service that requires a registration and the registration process sends some confirmation emails. These emails say in a three-line message that you have to click some link with a generated token to complete the registration. We send these…
Ilya Saunkin
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5 answers

What's a good alternative to the Barracuda Spam Appliance?

Searching for Barracuda alternatives didn't yield much. Can anyone recommend a good spam appliance like Barracuda? I want something that will strip bad stuff out like if I have a .txt attachment that is really an .exe. It sends the email but…
johnny
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