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

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13 views

How to remove an entire Qmail queue? [duplicate]

I have a Qmail MTA queue with 100k messages in the queue. How can I remove the entire queue? I need to regain control of my machine, I will investigate the compromised php scripts afterwards. The ...
1
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1answer
43 views

Benefits of separate firewall product over AWS Security Groups for spam requests

I have a question that is an extension of this one: Examples where an AWS Security Group is not sufficient as a firewall?. Initially, the answer in that question made sense to me and I was working ...
1
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2answers
83 views

How to block IP addresses from port 25 [closed]

PROBLEM: Users are getting 15-20 SPAM emails per hour, even with SpamAssassin set to its most aggressive settings SOLUTION: SPAM filtering services are available from companies like McAfee (Intel). ...
0
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1answer
31 views

Blocking spam with SpamAssassin [duplicate]

I have a server that runs websites and exim for e-mail. I've added countless RBLs including barracuda to try and cut back on incoming spam. However, they still keep coming in. The clients use ...
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1answer
199 views

How to prevent hackers from accessing my cPanel through a hostname instead of IP? [closed]

On my new dedicated server in which I have cPanel and WHM, I keep getting daily "large number of failed attempts to login from xxx" where xxx is an IP. So I blocked massive amounts of entire IP ...
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1answer
935 views

How to stop server sending spam out. Centos server with exim [duplicate]

I'm looking at a server that appears to have been compromised via a bug in a wordpress plugin and is now sending spam out. This post seems to give a very good report of exactly what I'm seeing. ...
1
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1answer
73 views

postfix header_checks - regex spanning multiple lines

I would like to create a spam filter that spans multiple lines in headers. This is my /etc/postfix/header_checks file: /^From:.*name[0-9]+@.+[\r\n]+To:.*name@domain\.com/ REJECT It's a valid ...
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votes
2answers
57 views

Emails from my domain getting blocked at all other domains [duplicate]

Recently I tried to set up a new email server using iRedMail on Lubuntu. The mail server workes very well when email conversation is in the same domain. But when a user tries to send email to some ...
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0answers
19 views

Scraping log to identify emails sent to another MTA

I have a Courier MTA that seems to be sending spam. I want to scrape courier's mail.log to identify, for each mail that was sent to another MTA: The from address Where Courier got the email from ...
1
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1answer
548 views

FROM: header is forged, SENDER: is legit , spam is delivered. how to detect?

In short: What happens: FROM: header is forged, SENDER: is legit , spam is delivered. What I need: Detect forged FROM: header when possible, block delivery Explained: I have a exim server that ...
1
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1answer
1k views

SpamAssassin doesn't appear to be 'learning' from forwarded examples of spam

I have spamtrap@ and hamtrap@ addresses set up on my mail server and forward examples of spam to the spamtrap address. I was hoping that after a few examples, SpamAssassin would 'learn' to identify ...
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3answers
600 views

Chinese bot visiting non-existent page every 5 minutes

Since 02.05.2013 some sort of bot is visiting my website, every 5 minutes. Most of the time it calls this URL, which doesn't exist: /viewtopic.php?f=3&t=849 Always with this user agent ...
2
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2answers
76 views

Block people searching for server admin pages

Occasionally I flip through our (apache) access log and I often come across people trying to fish for admin pages. For example, they are trying to access pages like: /wp-login.php ...
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0answers
31 views

Server exploited, perl script sending spam [duplicate]

my server with centos 6 is sending massive spam. Before move the backup on the new clean server, I must understand what is going on. let's read some logs mail log Jan 10 14:21:00 vps63495 ...
53
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6answers
17k views

Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

This is a Canonical Question about Fighting Spam. Also related: How to stop people from using my domain to send spam? What are SPF records, and how do I configure them? There are ...
0
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1answer
578 views

dkim-milter appears not to be signing my emails correctly

I have a VPS that I had a fresh install of CentOS 6 on it and then I installed virtualmin on it and we've been great for a few months. I've been hosting a handful of domains from there and on one of ...
14
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8answers
8k 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
437 views

Mail goes to spam when using `mail` from command line

I've a CentOS 6.4 server. When I send an email using the mail command from command line, it's always marked as spam by Gmail. So, every system emails go to spam and so do every emails sent with a PHP ...
1
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5answers
796 views

What is the easiest to install and maintain email server? [closed]

I really don't like administration tasks but i need a VPS (a naked Debian system - no control panels) for some reasons. One thing that scares me is the setup of the Mailserver - never done this before ...
12
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10answers
3k views

Using fake MX records to combat spam

I have a client that is getting heavily spammed.. It's the 15th of the month and POP3 bandwidth is almost 100 GB. There are only 7 e-mail accounts on this domain. I installed SpamAssassin set it to 5 ...
1
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3answers
2k views

How to block this URL pattern in Varnish VCL?

My website is getting badly hit by spambots and scrappers. I've used Cloudflare but the problem still remains there. The problem is spambots accessing non-existing urls causing a lot of load to my ...
3
votes
1answer
92 views

Why am I getting these emails?

Awhile ago I noticed that email messages from my domain is not immediately delivers by google, and I'm getting an smtp error message from google server. I don not remember the exact wording of that ...
0
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2answers
91 views

opensource feedback loop implementation for email and webmail integration

I would like to find out if there is an opensource software that implements the Feedback Loop. I will try to be more specific. I want my clients to have the ability to report a message as spam and ...
4
votes
5answers
10k 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 ...
0
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1answer
3k views

Plesk 11 Set firewall rules manually [closed]

I have a big spamming problem on my site from ip addresses coming from Asia. My website is designed for people in France and Canada, so I want to block all ip addresses from Asia to avoid spam. I ...
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0answers
12 views

Blacklist mail server [duplicate]

I have checked my IP in all spam lookup sites. those sites are DNSBL.info, spamhaus.org, barracudacentral.org, spamcop.net, blacklistalert.org and all of it says that I am clear. But when I checked it ...
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1answer
43 views

Individual accounts being spammed on server, even though DNS not hosted [closed]

Disclaimer: Please pardon the newbery! I've got a dedicated linux server from HostGator that has around 100 accounts on it. Lately, dozens of these accounts get bombarded with junk mail a few times a ...
20
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3answers
1k views

What are the best methods for catching snowshoe spam?

I'm using Smartermail for my small mailserver. We've been having a problem lately of getting waves of snowshoe spam that follow the same pattern. They come in batches of 3 or 4 at a time. The ...
-1
votes
2answers
106 views

Postfix, I'm receiving a lot of undelivered mails (logs inside)

Some days I receive a lot of Undelivered emails, it's like my server is used as relay. But I don't know if that's only backscatter emails or my server is really used as a relay. Here is what I found ...
0
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1answer
217 views

Plesk 12 Linux Server Mail Spam Issue [closed]

I'm running multiple websites on my dedicated server, and for one website in particular where users signup and then must verify their email address, I'm getting reports from my client that a small ...
1
vote
2answers
76 views

My site is suddenly getting slammed, not legitimate traffic

I run a site with about 700 registered users. On a typical day, there are 30-50 hits. In the last three days, the traffic has increased insanely fast (according to Google Analytics). I got 7,287 hits ...
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2answers
4k views

cPanel Server Email to Gmail marked as Spam, SPF, DKIM, and rDNS pass

Having this issue on a cPanel server 11.34.1 that hosts multiple domains. Email originating from this box on the sendingdomain.com address is flagged as Spam by Gmail. I've implemented SPF and DKIM, ...
0
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1answer
164 views

Security Risks of catch-all email address [closed]

What additional security issues does an MTA and email client face if a catch-all email address is setup on an sub-domain (that isn't published/publicly listed anywhere) compared with setting up ...
0
votes
1answer
61 views

moving emails on cPanel or plesk to specific folder based on tag [closed]

I have hosting servers with cPanel and Plesk, which have more than 1000 customers. I want that when any email is marked as spam, then it should be moved automatically to JUNK folder, instead of ...
0
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1answer
279 views

Getting lots of traffic from russia to an unpublished site

I am currently building a website. Currently nobody knows about it but it is already reachable for testing purposes. Now I saw, that I get a lot of traffic from russia (Its a german website hosted on ...
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2answers
487 views

AOL bounces with: AOL will not accept delivery of this message [closed]

AOL started bouncing emails from my mail server with the following error: 521 5.2.1 : AOL will not accept delivery of this message. 554 5.5.0 Remote protocol error On the troubleshooting page AOL ...
0
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0answers
10 views

getting lots of spam from “unknown” and helo localhost [duplicate]

On our server, we keep receiving spam with the following headers. We are using whm 11.44 and exim. Return path is always: Return-path: <> and it says Received: from unknown (HELO localhost) Both ...
8
votes
4answers
12k 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 ...
0
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0answers
45 views

Information to keep in a spam black/whitelist

Assuming that I want to black/whitelist specific messages as spam/not spam, what message/sender info should I collect in that blocklist? The address will be most likely faked so I assume the 2 ...
2
votes
1answer
123 views

Can someone explain SMTP Callbacks when BATV is enabled, and when to issue the verification?

This Wikipedia article describes how SMTP verification of the MFROM may have issues if BATV is enabled. Servers that reject all bounce mails (contrary to the RFCs). To work around this problem, ...
0
votes
2answers
268 views

Postfix 2.9 or sendmail, outgoing spam prevention (check if sender exists)

Operating System: Linux Ubuntu 12.04 TLS Context: Plesk 11.5 Utility: Postfix 2.9.6 (updates restricted by Plesk 11.5 distribution) I would like Postfix to check the 'sender' field of every ...
0
votes
6answers
1k views

Email sent, but recipients do not receive it?

I have been struggling for this issue for months. I have a website, that the registration requires email authentication. I did a check (daily), the statistics are quite interesting. Everyday, out of ...
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votes
1answer
88 views

How can I avoid being classified as spammer when I forward mail to a gmail account? [duplicate]

Update: The link pointed to by the "duplicate" initially didn't seem like the same problem to me, because the post talked about blacklisted "domains" not blacklisted "IP addresses." However the main ...
0
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0answers
15 views

SCL not available for single user

Recently migrated from Exchange 2003 to Exchange 2010 with Edge server. Problem is: All incoming mail for one specific user bypassing Mail Content Agent checks, there is a record from logs: ...
6
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13answers
8k 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 ...
3
votes
1answer
156 views

Configure Barracuda Spam Filter behind Postfix to use client IP when do RBL-checking

I have the following setup: Internet -> Postfix Mail setup as Proxy -> Barracuda Spam Filter -> Microsoft Exchange I have tried searching through the documentation and configuration panels to see ...
1
vote
1answer
2k views

Any way I can send Spam to my mail perimeter in a controlled way for testing?

I just set up a Postfix/Procmail/SpamAssassin server but I am not convinced that it is really doing much filtering. I have gotten it to recognize the SpamAssassin special Spam code that produces a ...
0
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1answer
253 views

How to configure SPF and DKIM to prevent mail going to spam folder

When creating a mail with PHPMailer my emails are getting sent to the spam folder of my recipients mailbox I have been told I need to configure my SPF and DKIM correctly, I think I have done this ...
1
vote
1answer
222 views

Postfix mail sent to SPAM in Yahoo and Outlook (SPF, DKIM, DMARC also configured)

I have implemented DMARC in out email server and got the response from some of the email domains as follows, <?xml version="1.0"?> <feedback> <report_metadata> ...
0
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1answer
47 views

Spam Firewall for Exchange 2013 Environment

We are currently using Exchange 2013 and we are interested in the Barracuda Spam Firewall. We are trying to figure out a way around our current email flow setup. We currently have multiple users with ...