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

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3
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4answers
230 views

Spamming from my Linux server

Hi I was wondering if anyone could help. I got a email from my host company that there are some weird traffic coming from my server. A quick look into the log file revealed the sample log below. There ...
3
votes
2answers
2k views

spam from your own email?

I have recently been receiving spam that has been listed as my own email address. I remember doing a few telenet emails back in school and know there are some ways to send looking like they are coming ...
3
votes
3answers
826 views

How do I prevent mail from my Exchange server from being blocked?

Recently one of our client machines was infected with a virus and I believe was spamming addresses in the user's contact list. Since then our server has been appearing on blacklists and it has been ...
3
votes
2answers
12k views

Allow email from a particular sender through spam filter

We are running exchange 2010 and are using the built in anti-spam feature. We have set up Content Filtering, IP Block List Providers, Sender ID, Sender Reputation and it filters out most of the junk ...
3
votes
4answers
301 views

Minimize the chance my email is blocked/filtered as spam

I'm running a web-based store where order confirmations are sometimes blocked and don't reach the intended user. The structure of the business model is such that our product is marketed to the ...
3
votes
6answers
6k views

How to check my linux server isn't spamming

I'm worried about dodgy php scripts or other malicious software on my linux server sending out spam. Or maybe I left an open relay What are the ways to check I'm not sending any spam out?
3
votes
1answer
5k views

Postfix Whitelist before recipient restrictions

Alright. Some background. We have an anti-spam cluster trucking about 2-3 million emails per day, blocking somewhere in the range of 99% of spam email from our end users. The underlying SMTP server ...
3
votes
3answers
2k views

How do I spamtrap with Postfix?

How do I setup spamtraps with Postfix so clients that send to trapped addresses are prevented from sending me more spam?
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 ...
3
votes
2answers
101 views

Postfix - forward rejected by unknown recepients emails to SPAM-learning mailbox

I have Postfix + BitDefender FRAMS running as hygiene gateway before few Exchanges. BD FRAMS can learn it's Baesian filter by download SPAM and HAM emails from dedicated mailboxes. Because we have ...
3
votes
1answer
842 views

DNSBL listed at zen.spamhaus.org - cant get outgoing mail working? Am I interpreting the response correctly?

I have problem with a mailserver and there is something I kind of not understand! I can connect, authenticate, specify the sender address - but when specifying the reciever i get a error 550 which ...
3
votes
5answers
192 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 ...
3
votes
2answers
4k views

Gmail.com detect mail as spam, but the server is not on any BlackList

I have an issue with Google. (GMail to be exact) About 1 month ago, we had a security breach, and mail was relayed through our servers. we got listed in almost ALL Black-Lists :( we fixed the ...
3
votes
6answers
4k views

Hotmail and Live.com rejecting all emails

I have been having problems sending emails from my server to hotmail.com and live.com email addresses. I have read other posts on serverfault but they have not been helpful. Here is the error message. ...
3
votes
5answers
223 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.
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?
3
votes
1answer
427 views

What problems can an ADSP record in DNS cause for mailflow?

ADSP is an entry in DNS that works allows a domain owner to assert that all email must be signed with DKIM. (similar to the -all and ~all in SPF/SenderID). Messages that fail ADSP policy may be ...
3
votes
1answer
425 views

Which RBL's does sophos use?

Anyone know where I can find the a list of which RBL's Sophos use's? I have checked their website with no luck, and currently awaiting a response from their technical support. Thank You in advance ...
3
votes
3answers
1k views

Sign multiple domains with single Domain Key (dk-filter)

Motivation The private shopping website GILT, send periodical update emails from giltgroupe.bounce.ed10.net however all of the mails are signed with domain keys of giltgroupe.com. mailed-by ...
3
votes
1answer
76 views

Avoid spammers who download content for the sake of using bandwidth

My company has a product which is downloadable through our website. Since day one, we've been continuously spammed by bots trying to download a little bit of content all the time (usually 4 MB out of ...
3
votes
1answer
1k views

Spamassassin? update channels?

I know this was asked here: but things seem to have changed. It appears that the old SARE rules are listed as broken The recommended SOUGHT channels seem to be down and DNS is broken for ...
3
votes
1answer
356 views

How can I explain to dspam that the user “brandon” is the same as “brandon@mydomain”

I am using dspam for spam filtering by running the "dspamd" daemon under Ubuntu 9.10 and then setting up a Postfix rule that says: smtpd_recipient_restrictions = ... check_client_access ...
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 ...
3
votes
2answers
850 views

Mail sent to gmail goes directly into spam

First I would like to state I already searched through the database for similar questions to mine. Tried all of those suggestions but none really seem to work. The problem is the following: I ...
3
votes
1answer
73 views

What is the benefit of using DKIM to sign Content Type?

DKIM has the ability to sign headers on a per-header basis. I looked at Google's headers, and they DKIM sign ContentType. What is the security benefit of signing ContentType?
2
votes
5answers
167 views

What are the different triggers that email servers use to mark email as spam

I believe that all the major email servers will look at the following before they decide to mark a received email as spam or not. 1. Mx record. 2. SPF record. 3. DKIM signature. 4. SMTP ...
2
votes
5answers
12k views

How do I remove IP from sorbs.net blacklist?

Our email server has ended up in the sorbs.net blacklist and we're going round in circles trying to get it removed, currently this is causing down-time between our suppliers. I am a developer and not ...
2
votes
4answers
445 views

My datacenter is unable to add PTR/rDNS record, then how can I prevent the mail outgoing from going to spam folder?

I am having problem that mail sent out from my server all goes to recipient's spam folder. I am running Drupal sites on Linux server. CentOS w/ cPanel. Our users cannot receive email as the mail ...
2
votes
6answers
182 views

Does disallowing sending emails via a SMTP server that doesn´t have the same address help preventing spam or is it dangerous?

I am working in a small programming company and administrated the mail-servers for quite a while. Now we moved our web site and the MTA to a company that we considered to be more professional. But I ...
2
votes
7answers
7k views

all mails going to gmail SPAM (sendmail on centos) 127.0.0.1 problem?

UPDATE ON SPF CHECK http://www.openspf.org/Why: The SPF check gives me this: An SPF-enabled mail server rejected a message that claimed an envelope sender address of support@ourdomain.com. An ...
2
votes
5answers
312 views

banned IP addresses when buying a dedicated server and email spam

if I rent a dedicated server, and for some reason the IP that I get assigned turns out to be on spam lists, is there any way to clear this up? If yes, how long does it usually take?
2
votes
7answers
250 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
4answers
1k views

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 ...
2
votes
4answers
8k views

How do I get my server off the ivmSIP/24 blacklist?

I checked my server IP using this tool: http://www.mxtoolbox.com/SuperTool.aspx It's come up on the ivmSIP/24 list. What can I do to get my IP removed from this list? I have SPF records set to ...
2
votes
1answer
185 views

Issue of tracking an email that was “lost in cyberspace”

The issue here is one of an email that has been "lost in cyberspace." The receiver is claiming never to have received it. However, I recieved an automated out-of-office reply as a response to my ...
2
votes
5answers
5k views

Open Source or lower-cost alternatives to Barracuda Spam Filter

I'm aware of SpamAssassin-based solutions, but I'm looking for a free or low(er) cost spam filtering solution that's similar in functionality to the Barracuda Spam Filter. The Barracuda works well, ...
2
votes
6answers
359 views

I'm hosting reseller and I got spam problems. Please help to solve

Our provider suspended our account with 5000+ clients and their sites. The reason was that the whole IP range was blacklisted by SpamHouse, but our provider did not explain what emails, form what IP ...
2
votes
2answers
185 views

Recommendations for an external email marketing service [closed]

First off, let me say that the small number of emails we send out are not spam. We include removal links and the emails are generally centered around free webinars that our marketing department hosts. ...
2
votes
4answers
745 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 ...
2
votes
2answers
749 views

How to make sendmail accept connections from localhost only

I need to secure the server by making sendmail-mta accept only local connections (from localhost), so that any external (potential spam) connections are denied. I use Debian 7.0 currently.
2
votes
4answers
255 views

Email getting marked as spam by gmail, hotmail but OKed by spamassassin

I am having some issues with emails getting sent from one of my websites using the PHP mailer. When I am using my own email server with spamassassin the emails come through without a problem, but with ...
2
votes
2answers
680 views

sendmail is using return-path instead of from address

I have a customer that is complaining about emails marked as spam. I'm looking at the header. It shows the correct From: reg@company.com However, it doesn't like the return-path. Return-Path: ...
2
votes
4answers
1k views

trying to set up a newsletter server, hotmail blocks me

I have little experience setting up an email server so I'm having a lot of dificulties right now. A client from a political party wants to send a newsletter to 8000 people with a very limited budget ...
2
votes
1answer
333 views

how to block network level mail spammer?

Here is the packet capture of how the attacker is coming to my server and generating Huge amount of spam, i am not able to block it by any means. 220 mta1497.mail.ne1.yahoo.com ESMTP YSmtpProxy ...
2
votes
3answers
285 views

Can Spammers get your email address if it's set as postmaster, webmaster, etc?

When you set-up a "postmaster" email in postfix/cyrus/dovecot/fetchmail, etc, or a web-master address in an apache vhost, can spammer's query your server and get that information? Or is it only for ...
2
votes
7answers
916 views

Whether to filter (for spam, viruses) outgoing mail or not?

The purpose of this questions, is to understand pros and cons of filtering outgoing mail. I am admin of an ISP. As usual, users, who have dynamic IPs, can send mail only with ISP's SMTP server. ...
2
votes
3answers
951 views

Exchange 2007 NDRs

We have NDRs disabled on our Exchange 2007 server to prevent backscatter. Is there any way to enable NDRs only when messages exceed size limits? It can be frustrating for people when their messages ...
2
votes
2answers
42 views

Sending mail from sub-domain on different server from domain getting flagged as spam

Our client owns a server with a domain: website.com We have a server that our client points videos.website.com to. Emails sent from videos.website.com are getting flagged as spam because website.com ...
2
votes
2answers
622 views

postfix sending mails to unknown addresses

I was checking my munin tables and saw a huge list of deferred mails in postfix and looking into /var/log/mail.log gave me an idea: I am sending mails to unknown mail addresses: Dec 23 08:21:32 ...
2
votes
2answers
646 views

Has this server been compromised?

A friend is running a VPS (CentOS) His business partner was the sysadmin but has left him high and dry to look after the system. So, I've been asked to help out in fixing an apparent spam problem. ...