The spam-prevention tag has no wiki summary.
0
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1answer
46 views
Global Authority for Blacklisting IPs
I know that there are few common ways to block attacking IPs (such as deny in htaccess). Additional to that, we could get a huge list of IPs to block from misc sites such as :
...
-1
votes
1answer
43 views
Sendmail mqueue deferred (list.dsbl.org) [closed]
Hi I have a issue with a mailserver configured with sendmail.
In mailq I have many entrys with:
(dnsbl map: lookup (254.0.168.192.list.dsbl.org.): deferred)
Thanks.
0
votes
1answer
103 views
Whitelist rule for reject_rbl_client in Postfix?
Is there a way to add an exclusion/whitelist rule (or similar), which would work against reject_rbl_client behavior? I have a postfix service running, with following client restrictions:
...
1
vote
1answer
41 views
Open Proxy Spam Traffic
I have an apache server that was misconfigured and left as an open proxy for a week. A bunch of requests for forwarding pay-per-click advertising started streaming in and using our server.
This ...
0
votes
1answer
76 views
Mail is marked as spam although SPF and DKIM pass
I have configured Postfix to send mail from a dedicated server hosted let's on IP X.X.X.X and domain name example.com.
DKIM, SPF always pass when I send mail locally from that host but still ends up ...
1
vote
0answers
37 views
Uncontrolled spam sent from server [duplicate]
Hi I have shared hosting on a UK2 server that got suspended again. They claim that my account is sending SPAM messages but the problem is that I can't trace those from the information they've given me ...
0
votes
2answers
190 views
smtpd_helo_restrictions = …, reject_unknown_helo_hostname occasionally rejects mail I care about, how to handle?
I have configured my postfix as follows:
smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unknown_helo_hostname
This is working well because most spambots don't seem ...
-1
votes
2answers
62 views
All Details of a Running Process [duplicate]
Possible Duplicate:
How do I deal with a compromised server?
This process is running on my Linux server and is sending spam (connecting to port 25 and port 80 with random IP's).
top - ...
1
vote
1answer
124 views
Sending email from a Google Apps address
I have a website in a Linode VPS in Linode.
The email address to receive emails is hosted in Google Apps, but I send emails from postfix.
For that to work and not cause problems with spam folders, I ...
0
votes
0answers
72 views
DNSBL exclusion list DUHL / servers still reject with 127.0.0.10
I got an static IP address from provider, that was enlisted in dynamic users and host list DUHL at sorbs.net. I registred there and managed to get address to exclusion exDUHL list.
When I try ...
0
votes
0answers
66 views
Would you recommend project honey pot's mod_httbl? [closed]
I'm very interested in project honey pot. It seems like a smart way of blocking harversters etc from your web server.
I found out about mod_httpbl for apache but I haven't find much to read about it ...
1
vote
2answers
109 views
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 ...
2
votes
2answers
87 views
Tons of spam on dreamhost mail user account
I use dreamhost for my webserver/ email host.
I have about 25 users on one domain. and 1 of these users is absolutely inundated with spam every day.
I have tried using dreamhosts poor blacklist ...
1
vote
3answers
371 views
How to block this URL pattern in Varnish VCL?
My website is getting badly hit by spambots and scrappers, I am using Cloudflare but the problem still remains there. The problem is spambots accessing non-existing urls causing a lot of load to my ...
30
votes
4answers
1k views
Is greylisting still an efficient method for preventing spam?
I've used greylisting on my servers for many years, but I don't know how effective it is nowadays.
Is it still good for fighting spam in 2012?
Or is the typical spammer MTA capable of resending ...
-3
votes
1answer
49 views
Stop BPimage walker bot [closed]
How can i block all bots except a few including BPImage walker...it is creating a huge amount of load on web site and consuming lots of bandwidth
56
votes
9answers
12k views
How to stop people from using my domain to send spam?
This is a Canonical Question about Fighting Spam. Other relevant questions include
* Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?
I receive Mailer Daemon ...
1
vote
1answer
89 views
Tracing of spam sender
I have a mail server using CenOs 5 as Os and postfix as an MTA.
My mail server is used for sending mails of clients subscribed to send mail from my server.The problem is that some of my clients are ...
0
votes
2answers
345 views
SpamAssassin sending legit emails to spam, despite sender being whitelist
I can not for the life of me figure out why emails from a "white-listed" sender are still getting very high scores from SpamAssassin and not being delivered.
The email headers are:
From ...
-1
votes
1answer
78 views
every email marked as SPAM or not even delivered? [closed]
I am having a very serious problem!
I registered the domain http://codepigeon.com a while back (2 months) and have dev. an app to easily make changes to ones source code across multiple webpages or ...
-3
votes
1answer
293 views
Email header analysis
I have an email header which is showing the following information, which i believe is faked.
The mail purports to be from a gmail account but I'm not sure if this is the case.
Ordinarily you read the ...
5
votes
2answers
298 views
97% of emails reaching IronPort/Domino are Spam
We have a Domino mail server protected by Iron Port (v7.1.5 I think). Iron Port reports an average 96%-97% of emails are stopped by reputation filtering, and around 3% of emails are clean messages.
...
1
vote
1answer
116 views
Recovering a server from being an open relay
One of our Mac Pro machines running Apache was inadvertently acting as a forward proxy with a public IP, after some organisation proxy rules changed.
Consequently it was discovered by spammers and ...
1
vote
2answers
436 views
Postfix: how to verify sender's MX record
is it possible to configure Postfix to verify the sender's MX record?
For example: if a mail comes in from some.sender@example.com it should look up the MX record(s) for example.com and verify that ...
1
vote
1answer
457 views
Mail classified as spam, but passes SPF and DKIM
I have configured Postfix to be responsible for subdomain.example.com (google apps is responsible for example.com so I didn't want to mix the two).
As I mentioned in question title, SPF and DKIM ...
4
votes
1answer
49 views
Postfix/Spam Prevention
How do I make Postfix reject all mails when the client is not authenticated and the sender is from my domain? Is there an easy way to do this?
1
vote
2answers
114 views
SBS Email Outbreak
I have a client that is running SBS 2003 Std. and they have some sort of mass mailer that is spamming mail. We are running the most current defs. of Vipre anti-virus, we are not a setup as a relay, ...
0
votes
2answers
478 views
Spammer using my server. How to stop him?
looks like a spammer got into my server. I am new to LAMP and don't know how to find where my vulnerability is, not sure if SMTP, scripts, or where. My server was working fine for over a year but now ...
2
votes
5answers
389 views
How to notify Gmail, Hotmail, etc. that you are a legitimate website sending lots of notification to users
Although I have already done everything, like adding SFP, DKIM and sending plain text in my emails, I want to notify Gmail, Hotmail, Yahoo, and other "big" popular email providers that I'm legitimate. ...
1
vote
1answer
192 views
Preventing Postfix backscattering
I am having problems with the Postfix mail server being used for backscattering, I have tried the suggestions in the manual but nothing seems to work. Does anyone know how we can reject any mail from ...
1
vote
1answer
76 views
Temporary E-mail Addresses in Business
I'm a big fan of services like mailnull which allow users to give a temporary e-mail address to prevent spam.
I'd like to give something like this to my users.
Does anyone know of any solutions ...
0
votes
2answers
77 views
Blocking spam from free e-mail providers
I'm having a bit of an issue with a recent spam wave on my network. We're using a variety of e-mail checks that have been quite successful thus far, but these e-mails are presenting a problem.
They ...
3
votes
4answers
496 views
Are 10.10.0.3 and 10.10.0.4 IP's for spammers
I have a site that is getting bombarded by requests from 10.10.0.3 and 10.10.0.4. I couldn't find where these servers are. What is the best way to regulate this? I could just deny those IP's but I ...
0
votes
1answer
276 views
Tracking down spam email source account in cPanel WHM
Given a spam email header sent from a cPanel WHM server, is there a way to track down under which cPanel account it was sent from?
0
votes
3answers
335 views
Host small office email on Snow Leopard Server or external host company?
I have a network of about 30 users. We are migrating from a Windows environment to Macs. We currently have a Windows 2003 server hosting the email accounts with the help of an external spam filter. ...
0
votes
2answers
243 views
Do I need to enable TLS support for postfix?
I need to send out notifications from my web-app and I've setup postfix as a null client on my server. So in my /etc/postfix/master.cf I have commented out the lines
#smtp inet n - ...
5
votes
2answers
253 views
Attack from anonymous proxy
We got attacked by some very-bored teenagers registering in our forums and posting very explicit material using anonymous proxy websites, like http://proxify.com/
Is there a way to check the ...
0
votes
1answer
303 views
Server and Application architecture for large outgoing email volume
we need to develop an application to send large amount of emails (newsletters)
We estimate 15 millions of emails per month (6 - 10 emails per seconds).
Would you recommend me the proper architecture ...
47
votes
8answers
45k views
Dealing with HTTP w00tw00t attacks
I have a server with apache and I recently installed mod_security2 because I get attacked a lot by this:
My apache version is apache v2.2.3 and I use mod_security2.c
This were the entries from the ...
2
votes
1answer
354 views
Desperation: All FIVE of my Postini clients' accounts have been deactivated
Note: This is re-telling of a message I just posted to Google's support forums.
Well, this week has not been good.
I have five clients on Postini. All of the clients accounts were purchased ...
0
votes
1answer
104 views
Mailing-List migration and double opt-in [closed]
I'm in the process of migrating a Mailman mailing-list of about 500 subscriber addresses from one server to another. The list-owner is an NGO and I'm not sure about the carefulness by which the ...
2
votes
5answers
699 views
Blacklisting: IP's or domains?
I am implementing a blacklisting system on my website that monitors contact forms for suspicious usage (both spam content and excessive frequency).
When I find somebody / robot that meets my criteria ...
1
vote
7answers
659 views
How can I check if an email address is associated with spam?
Does anyone know a way to check if an email address is associated with spam sites? I'm looking to add a check prior to allowing someone to register on my church's website. Apparently my church is a ...
