Unsolicited e-mail, comments or posts, often sent out in large volumes; possibly but not necessarily commercial in nature

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Exchange 2007: Move messages with SenderID fail to Junk Mail Folder?

In Exchange or Outlook 2007, is it possible to move messages with a "Fail" or "SoftFail" SenderID status to a mailbox's Junk Mail folder? I keep getting spam that fails SenderID, but has very low ...
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3answers
154 views

Are there any tools for comparing DNSBL effectiveness?

I just added a new DNSBL to the list of ones that I use on my small mailserver. I set it up to be first on the list because I wanted to see what it missed but other lists caught. I'm watching mail ...
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2answers
423 views

SMTP Outbound-Only: More or less reputable?

I'm reconfiguring some mail architecture and wondering about this... For the purposes of avoiding blacklists and maintaining a good MX reputation, is it better to have: One public IP / SMTP server ...
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5answers
478 views

DNSBL - Email Servers Spam

I'm currently doing research on a better way for emailing customers our news letter and not using an ESP such as vertical response since most users there use purchase list and ruin the shared IPs for ...
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2answers
1k views

postfix skip spam checks for authorized SMTP

Is there any way to configure postfix to skip spam/antivirus checks for those smtp connections that are SMTP-AUTH'ed? I would like to keep all the standard checks for external smtp traffic, but for my ...
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4answers
2k views

Prevent spamming

How to prevent spamming in Cpanel / Linux server ?
7
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3answers
4k views

SMTP message rate control on Ubuntu 8.04, preferably with postfix

Maybe I am chasing a bug but I am trying to set up a smtp proxy of sorts. I have a postfix server which receives all the email for a collection of servers/clients. It them uses a smarthost ...
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8answers
6k views

Why do 'hackers' setup bots repeatedly fill out web forms?

There is something I don't get, one of my web apps has a small form that allows you to enter you name and email address to "subscribe" to a user list for a site I maintain. The site is very low ...
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2answers
1k views

Block mails with local from-addresses from unauthenticated senders using courier-esmtpd

We run a small courier mail server (courier-esmtpd). It is configured to accept mail from authenticated clients without recipient restrictions and mail from everywhere to local addresses: ...
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5answers
3k views

Why are email messages sent from my PHP application being treated as spam?

I have this funny thing. When I send an email out, to yahoo, gmail or hotmail users. If I include a link, it will treat as spam mail. But if i removed the link, it will become "inbox", not spam mail. ...
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2answers
3k views

Open source antivirus/antispam/web filtering gateway [duplicate]

Possible Duplicate: Open Source Unified Threat Management Software Options I want to install firewall which have following features Antispam, Anti Virus, Webfiltering, Userwise access, ...
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2answers
2k views

How do I throttle outbound email with sendmail

I know, I know, I should switch to Postfix. But in the meantime, how do I throttle outbound email (especially email to a single domain) in Sendmail?
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1answer
1k views

Setting up a Barracuda Spam Filter

We have just purchased a Barracuda Spam Firewall 300, we have set it up but are having problems authenticating with our Exchange server (2007). I spoke to Barracuda about it and they said I need to ...
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3answers
813 views

why spamc keeps getting me 0/0 when I test it?

on my centos 5 I've installed spamassassin and I want to execute it from php using the command line client. The problem is that each time I run it, I get as result: 0/0 here is how I run it ...
3
votes
5answers
181 views

Anti-spam measures for websites

What are anti-spam measure I should consider before launching my user content website? Some things I have considered: Silent JavaScript based CAPTCHA on the register page (I do not have an ...
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13answers
5k views

Relatively easy way to block all traffic from a specific country?

I know this sounds terrible, but I have a web app that has no users in the Philippines, but is constantly bombarded by spammers, carders testing cards, and other BS from there. I can see in the logs ...
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2answers
92 views

Is This Feasible - Running MailWash on a dedicated machine to pre-check

Is This Feasible - Running MailWash on a dedicated machine to pre-check 80-100 email accounts before end-users check with Outlook? We have some major SPAM issues at my company with some users ...
2
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7answers
249 views

Which forums systems are known for being good at avoiding spam?

We've been using phpBB3 as the forums for our business, and we've been plagued with spam bots left and right. In the end, I had to scrap the forums entirely because of all the junk. Our business needs ...
2
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3answers
8k views

Outlook - Junk Email - Add an email to the safe senders for entire company?

We've got an internal web based system that emails out reports on a regular basis. The emails are sent as: internalsystem@thecompanyIworkfor.com and the body of the email has a bunch of data and some ...
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7answers
5k views

Equivalent to denyhosts, but for HTTP requests?

My web server (apache2) is continually pounded by malicious bots, asking for URLs like these: ...
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2answers
694 views

Redirect all (non-rejected) spam to a special mailbox in sa-exim

I'd like to redirect all spams (that weren't rejected outright) to mailbox of local user spam (i.e. deliver mail to spam user rather than to original local recipient). I'm using sa-exim (exim 4 + ...
5
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7answers
560 views

Any antispam software beside SpamAssassin?

What other antispam software (server side) is available besides SpamAssassin?
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votes
6answers
2k views

Spam prevention tips for Postfix

Without using SpamAssasin, or similar, what are your best tips for preventing spam. Please try and provide config examples :D
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8answers
2k views

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 ...
2
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5answers
428 views

Spam and anti-virus on Exchange 2007?

I've found a number of solutions. They all say that they're the best (of course they do!) but they all can't be so I'd like some impartial advice. I would like to know your experiences of spam and ...
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8answers
183 views

End-user SPAM solution for Outlook users

We have almost 100 Outlook 2003 and 2007 users and we do not yet run our own exchange server. All of us have SPAM problems, but a lot of users have very serious SPAM problems, sometimes receiving ...
2
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2answers
192 views

Dealing with referrer spam

One of our primary webservers, which runs Apache on Ubuntu, is coming under attack from heaps of referrer SPAM requests lately. There's enough of this that it is really sucking up our internet ...
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6answers
30k views

How do you detect a spambot on your network?

I help manage a small network of about 40 computers. We are running an Exchange 2003 mail server. What is the best way to find which machine is infected by a spambot? I've tried installing anti-virus ...
17
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12answers
11k views

Which anti spam DNS blacklists should used?

i want to protect my mailserver with dns blacklists for fighting the spam. there a so many blacklists out there. currently i use: ix.dnsbl.manitu.net cbl.abuseat.org bl.spamcop.net ...
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10answers
2k views

Setting up a fake email address to trap spammers

I have heard it suggested that we set up a special email address, with it's only purpose being to be harvested. Then blacklisting every sender that targets this address. I'm wondering: if anyone ...
1
vote
6answers
467 views

legit emails in junkbox

Hey this is actually a reverse question. My personal email (firstname.lasname@gmail.com) is winding up in many peoples junkbox and I have no idea why. What may the cause be? Is it because it has the ...
6
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12answers
1k views

Recommendations for handling Directory Harvesting spam on Exchange 2003

Our Exchange server is getting slammed with anywhere between 450,000 and 700,000 spam messages per day. We receive about 1700 legitimate messages in the same time frame. Roughly 75% of the spam is ...
1
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2answers
4k views

Can I enforce mail rules server-side in Exchange 2007?

I have a client who gets a TON of spam to their public IP. I have put a Linux box running exim and spamassassin in front of it, and a bunch of Outlook rules to move mail into the Junk Email folder ...
2
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4answers
725 views

Is OpenDNS safe to use in a location with Exchange/Reverse DNS

I like OpenDNS, but was wondering if anyone has experience deploying it for a location with an Exchange installation. I'm concerned specifically about whether any filtering they do would cause ...
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5answers
7k views

Is it possible to trace a sent outbound email back to the origin?

So here's the situation. An email was sent from a computer within our organization yesterday and we were subsequently marked as spam because of it. We don't know who sent it. We don't know when it ...
12
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10answers
3k views

Where to go to see if my IP is blacklisted as a SPAM

This has happened before and some mail servers will tell you that your IP has been blacklisted (RBL, CBL, etc) but I can't find that site to check anymore and searches result in a site that may or may ...
2
votes
4answers
263 views

What is the best way to deal with spam or virus infected hosts in wireless network with personal laptops?

What is the best way to deal with spam or virus infected hosts in wireless network with personal laptops (like personal students laptops in university)? What polices and tools use your company?
8
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5answers
12k views

How do I configure SPF for multiple domains on a server? (also allowing gmail as a sender)

SPF (Sender Policy Framework) seems like a good way to combat spammers/spoofing. However, despite reading the explanations several times, I'm not quite understanding how to configure it correctly. ...
10
votes
5answers
6k views

How to minimise SpamAssassin (spamd) memory use

I'm using SpamAssassin on Debian (the default configuration with Pyzor, AWL and Bayes disabled, and sa-compile enabled), and each of the spamd child processes consume around 100 to 150MB of memory ...
4
votes
3answers
408 views

How to detect form spamming on your web servers?

If you run hundred of web sites on your servers, what it is the most efficient, automated way to detect if bots are using your HTML forms to send spam email, even if your forms have some kind of ...
2
votes
3answers
767 views

How do you configure sendmail to reject Email with a Date header too far from real time?

A friend of mine using (I believe) qmail has it configured to reject, as SPAM, any incoming Email with a Date: header that is too far from real time. I can't figure out how to do this with sendmail. ...
10
votes
7answers
2k views

Does SMTP greylisting a) stop much spam and b) stop much legitimate mail?

I've just set up an SMTP server on a relatively little used domain using Postfix and enabled greylisting with SQLGrey. So far it seems to be working OK, and while there's the slight irritation of ...
2
votes
1answer
197 views

Does the Anti-SPAM filtering in SmarterMail work on the Distribution Lists?

I have a few distribution lists running in "Subscriber Only" mode, meaning that only somebody who is subscribed to the list (or on the Whitelist) can post to the list. Some spammers have discovered ...
4
votes
9answers
913 views

Can anyone recommend a perimeter SPAM filtering service? [closed]

I am interested in what folks are using for perimeter SPAM filtering services. The service must: plug in via MX records in DNS (e.g. MX -> perimeter filter -> my mail server) can be secured such ...
14
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11answers
13k views

Good & free Exchange spam filter [closed]

Do you know a good (and free, if possible) Microsoft Exchange 2003 spam filter?
10
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5answers
2k views

Recommendations for SMTP services for massive mailing [closed]

What is the recommendations for SMTP services for massive mailing? Let me clarify, most of the free SMTP services (Gmail, Yahoo, Hotmail, etc...) has limits about the amount of messages you can send ...