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

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2
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1answer
379 views

Is there any point to Teergrubing anymore?

I'm just installing a new mail server, using Exim 4 and the sa-exim Debian package. Part of the configuration uses Teergrubing (or tarpitting), and while it sounds like a great idea in theory, I also ...
1
vote
3answers
1k views

Backscatter Issue

Can somebody please help me with this issue. In our company we are having issues sending emails to @hotmail.com addresses. I have contacted Microsoft "Support" directly about this issue and they ...
1
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5answers
3k views

what is the best antivirus and antispam addon tools for postfix?

Can you guys share some thoughts/experiences for antivirus/antispam for postfix. What is your antivirus and antispam combination used in your system? any particular reasons behind it? notable ...
0
votes
3answers
5k views

How do I lock down Exchange 2007 to accept email from a specific range of IP addresses only?

I have implemented a new Exchange 2007 server running on Server 2008 in our domain. We previously used Exchange 2003 running on Server 2003 and I had locked the Default SMTP Connector down so that it ...
2
votes
2answers
981 views

LDAP query for Barracuda

I have a barracuda spam firewall 300 that I just got installed the other day. I'm working on an LDAP query for using it with my exchange server. What i have so far is: (& ...
3
votes
2answers
1k views

Best Postfix spam RBL policy weight daemon?

I just heard about policyd-weight so I did an apt-cache search policyd which returns three options: policyd-weight postfix-policyd postfwd Which one is the best, and do you have any tips on ...
0
votes
4answers
3k views

hmailserver - I suspect that a spammer may be using my server

First, I'd like to verify whether or not a spammer is using my server. I've turned logging on -- which logs should I be checking specifically? Just SMTP? Second, I'd like to configure my ...
1
vote
1answer
230 views

SPF for various servers

Somewhat related to: http://serverfault.com/questions/4354/how-do-i-configure-spf-for-multiple-domains-on-a-server-also-allowing-gmail-as I have a MX record for my primary domain (j.com) that is my ...
1
vote
3answers
382 views

How to gain control of growing log files in 3 separate directories on my VPS?

I've got a VPS account that I set up with lxadmin. I've got a stats file at /home/http/tanguay.info/stats/ which is filling up extremely fast. Looking in it, I see that there are 1000s of entries ...
25
votes
6answers
36k views

How to send emails and avoid them being classified as spam

This is a canonical question about how to handle email sent from your server being misclassified as spam. For additional information you may find these similar questions helpful: Best ...
0
votes
2answers
510 views

Apache Rewrite Based on Mime Type

I’ve got a virtual host in my Apache config to deal with ads, spam, and malware sites. It works by having bad servers redirect to a specific loopback address that is mapped to the virtual host via the ...
3
votes
3answers
428 views

Hosted Anti-Spam Service vs. Anti-Spam Appliance

We're currently using Content Catcher, a hosted spam solution. For less than what we pay them per year, we could purchase an anti-spam appliance to run in house. From a simple dollar perspective, it ...
2
votes
1answer
565 views

Can I remove emails from /var/spool/sa-exim/SApermreject?

I have a lot of emails in /var/spool/sa-exim/SApermreject. Can I remove these emails or will this lead to some kind of nasty spam problem? Or is this just a history of all the emails that were never ...
2
votes
2answers
239 views

Spam daily report on servers using sendmail

we'd like to implement a daily spam report to our users like Dreamhost does. Basically we need to send a daily mail (at midnight for example) to inform a single user of all the emails currently in his ...
0
votes
1answer
162 views

Please give me an anti-spam mail measure recipe

How can I configure Procmail and SpamAssassin to catch spam?
7
votes
4answers
10k views

How does a Reverse DNS lookup work with regards to spam filters?

I have heard that most spam filters use a reverse DNS lookup on the originating IP address of the sending SMTP server (or something like that) as part of the verification process. I want to make sure ...
20
votes
4answers
3k views

Best Practices for preventing you from looking like a spammer [duplicate]

I'd like to feel more confident setting up mail for my clients with regards to false positives. Here's what I know: SPF records are good, but not every spam filter service/software (SFSS) uses ...
4
votes
6answers
3k views

Send email on behalf of clients

We're a communications company primarily doing printing of statements / utility bills, then mailing them out in the post. A few clients have asked for e-Delivery. Pretty much take the print output as ...
6
votes
1answer
485 views

Let Postfix handle spam in two ways

I've got postfix setup so that mail coming in from smtpd is automatically filtered through spamassassin (which reinjects it into the mailqueue with added headers) Now I want to do 2 things with ...
1
vote
3answers
540 views

Linux sendmail spam?

I have a linux server with sendmail doing spam filtering for some years. We usually do filtering spam by using spamcop, spamhaus, njabl but we dont seem to keep up. The number of spam mail getting ...
3
votes
5answers
221 views

What Security Suite to choose?

What security suite would you recommend in an environment consisting of roughly 120 PC's and some 30 servers? Environment is MS only, so Exchange and ISA must also be supported.
0
votes
2answers
2k views

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 ...
1
vote
3answers
155 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 ...
1
vote
2answers
428 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 ...
1
vote
5answers
481 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 ...
3
votes
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 ...
1
vote
4answers
2k views

Prevent spamming

How to prevent spamming in Cpanel / Linux server ?
7
votes
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 ...
11
votes
8answers
7k 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 ...
0
votes
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: ...
3
votes
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. ...
0
votes
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, ...
3
votes
2answers
3k 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?
2
votes
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 ...
0
votes
3answers
875 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
184 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 ...
6
votes
13answers
6k 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 ...
0
votes
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
votes
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
votes
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 ...
5
votes
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: ...
0
votes
2answers
703 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
votes
7answers
575 views

Any antispam software beside SpamAssassin?

What other antispam software (server side) is available besides SpamAssassin?
6
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
3
votes
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
votes
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 ...
1
vote
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
votes
2answers
195 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 ...
5
votes
6answers
32k 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 ...
18
votes
12answers
12k 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 ...