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

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2
votes
1answer
6k views

Postfix: Gmail marking my email as spam

I'm been trying to understand why Gmail is treating the email sent from one of my domain/server as SPAM. I found a lot of threads here about this issue, however I checked the usual suspects like ...
2
votes
4answers
281 views

Does sending e-mail in the name of customers increase the risk of being marked as spammer?

We are developing a SaaS website application that lets users send invoices to their clients. Ideally, these e-mails should appear to be originating from our customers, so the sender e-mail address ...
2
votes
5answers
1k views

Google marks seemingly perfect emails as spam

First post - was directed here from stackoverflow! The problem: Google marks seemingly correctly formatted emails from my apache/postfix server as spam. Sample email as follows; (I have replaced my ...
1
vote
4answers
13k views

Postfix- open relay. How to configure so it is not?

I have setup Postfix but am having trouble with the setup. Whenever I used to send emails to the server, it reject my mails saying 'Relaying Denied', so I changed the following in main.cf: ...
1
vote
2answers
5k 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 ...
0
votes
2answers
4k views

Yahoo flagging mail as spam when using relay server

I'm using Postfix to relay mail from my site to my mail server. Mail is received properly at my Gmail and Hotmail accounts - only Yahoo is the problem. The Yahoo mail headers state: Received-SPF: ...
0
votes
1answer
201 views

Do you need additional Security Products besides Forefront Security For Exchange Server

Does Forefront for Exchange Server 2010 cover the entire windows server or just the Exchange 2010 installation on a Windows 2008 R2 server? Do we need to run an additional Forefront product for full ...
0
votes
2answers
2k 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: *(at)...
11
votes
3answers
621 views

Email from our server tagged as junk by Hotmail Smartscreen unable to inform Hotmail that it is legitimate

Since more than 1 month ago we are having our email from one of our servers systematically tagged as junk by Hotmail Smartscreen filter. We have taken the following actions/measures without success: ...
4
votes
5answers
3k views

Why are emails sent from my applications being marked as spam?

I have 2 web apps running on the same server. The first is www.nimikri.com and the other is www.hourjar.com. Both apps share the same IP address (75.127.100.175). My server is through a shared ...
4
votes
0answers
83 views

Postfix/Spam Prevention [closed]

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?
4
votes
2answers
278 views

Running a mail forwarding service, what are some steps I should take to prevent my IPs being blacklisted

Background: I'm about to launch a service which offers email forwarding for a large number of domains. Say you want people to be able to contact you using you@somesite.com, all emails sent to that ...
3
votes
1answer
3k views

How can I prevent spoofed emails from outside thats using my internal accepted domain

I'm receiving spam emails sent from my own domain to my own domain. I'm using Exchange 2013. Example: myemail@mydomain.com is being used to send spam to myemail@mydomain.com. I can successfully ...
3
votes
2answers
2k views

Blocking PHP mailer spam using iptables

I host a public-facing web server running Debian Wheezy, and latest versions of Postfix, Apache, PHP, Spamassassin, ClamAV, rootkit hunter. Apache is configured with a handful of vhosts, each tied to ...
3
votes
4answers
2k views

Emails from custom domain going to spam

I just bought a custom domain that I'm trying to use as my primary email address. However at the moment many of my emails are landing in people's SPAM accounts. Are there any cheap ways around this ...
3
votes
1answer
9k 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
8answers
3k 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
2answers
405 views

Guidelines for Mail Servers - How to Maximize Deliverability to Remote Inboxes

My non-profit association has an Exchange server and a ListManager server to handle announcements to our members (about 800 email addresses) and several low-traffic discussion listservs. On the ...
2
votes
1answer
317 views

How to prevent your mail gateways from being blocked due to spam being sent via mail forwarding

We allow users to forward their e-mail to external addresses. From time to time, our mail gateway appliances' anti-spam engine computes a large spam campaign targeted to our users as a false-negative....
2
votes
2answers
245 views

Spamhaus XBL keeps adding my IP

Several days ago I found a message which was rejected in my inbox. It said that my IP is listed on Spamhaus XBL. Their page states: The reasons could be an Open Proxy or Spambot/Trojans. Checked all ...
2
votes
3answers
3k views

How to make spamassasin reject mail based on score?

I am running Linux with Postfix, Dovecot, Postgrey and spamassasin/spamd. This is my main.cf smtpd_recipient_restrictions = permit_sasl_authenticated, ...
2
votes
2answers
1k 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
3answers
307 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 ...
1
vote
3answers
3k views

Emails is marked as spam

Hi We have set up the DKIM in our mail server using sendmail and configured our DNS record also. Still our mails are marked as spam. Also when we sent the mail from outlook the domainkey ...
1
vote
2answers
2k views

Spam mail through SMTP and user spoofing [closed]

I have noticed that it's possible to telnet into a mailserver that I own and send spoofed messages to other clients. This only works for the domain that the mail server is regarding; I cannot do it ...
1
vote
2answers
2k views

Postfix - Block email from non-existent local addresses

My question is very similar to this one, but for postfix. We keep getting emails from addresses like "accounting@example.com" delivered to our actual "@example.com" addresses. From my google research,...
1
vote
3answers
7k views

DKIM error: dkim=neutral (bad version) header.i=

Ive been struggling the last couple of hours with setting up DKIM on my Postfix/CentOS 5.3 server. It finally sends and signs the emails, but apparently Google still does not like it. The errors I'm ...
1
vote
1answer
237 views

Email Delivery to Gmail Breaks After Implementing DomainKey

I have a personal VPS that I use as a personal email and web server. Today I was diagnosing email, and I created a test account at Gmail. At first I was not implemented DomainKey and only SPF was ...
1
vote
2answers
379 views

How to properly filter outgoing e-mail?

I have a platform consisting of many web servers doing shared web hosting. These servers run Linux and host tonnes of Wordpress, osCommerce, Joomla and other open source website platforms. Every now ...
1
vote
2answers
278 views

How to properly set SPF record in my domain (Google Apps)

http://www.google.com/support/a/bin/answer.py?answer=178723 How to properly set up my mailservers DNS record? I mean is it good to only set a: v=spf1 include:_spf.google.com ~all or is it better ...
1
vote
2answers
2k views

Can IIS automatically block IPs based on certain queries?

Can IIS7 automatically block IP addresses if certain queries are tried against my server? Like, is it smart enough to figure out that it's getting spammed by similar requests from the same IP under a ...
1
vote
4answers
3k views

All my domain's outgoing mail received as spam in gmail/yahoo/hotmail

All my domain's outgoing mail received as spam. I am not bulk emailing or anything like that. I know very little about how email actually works under the hood and having been continually searching for ...
1
vote
1answer
186 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
1answer
4k views

Why is my Zimbra mail going into the spam folder of yahoo, hotmail etc.?

All mail from my new Zimbra mail server is going into spam and junk folder of Yahoo or Hotmail. Any suggestion to deliver them direct into inbox? Below is the header part of my mail from yahoo... X-...
0
votes
2answers
3k views

Windows 2003 Server IIS SMTP Sending SPAM

we have a Windows 2003 Server using IIS6 for SMTP and Websites. A couple of weeks ago the server started to send out SPAM emails. I'm trying to figure out how to identify where the SPAM is coming ...
0
votes
2answers
432 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
votes
1answer
1k views

How to re-create Qmail queue

Qmail has 500 00 messages in queue and I installed qmHandle to help sort out the spam in the queue. This process has taken a long time and alternative scripts like qmail-remove also take time. I want ...
0
votes
0answers
40 views

Postfix — auto blacklist senders who send to 'honeypot' email addresses [duplicate]

I'm using postfix + spamassassin (amavis) now and I'm trying to increase my hit rate, so I've been looking at the logs to try to see any patterns in email that is obvious spam but gets low scores. ...
0
votes
2answers
693 views

Prevent server beeing flooded with requests

I'm hosting a Wordpress-blog on an Apache server (shared hosting). For some reasons I've been receiving like 100 requests per second to xmlrpc.php for a few days. The access.log looks like this: ... ...
0
votes
4answers
2k views

Emails are regularly blacklisted due to being hosted on a shared (blacklisted) server. What can I do besides moving away from this shared server?

My client's emails are blacklisted because his account is on a shared server which gets blacklisted from time to time. The hoster wants him to move to an expensive dedicated server. What could I do ...
0
votes
4answers
2k views

Exchange 2007 server send out spam

Our exchange server is sending out spam, as it has been listed on various spam blacklist and not to sure know how to stop it. I've started with verify SMTP with a site like http://www.pagasa.net/test-...
0
votes
1answer
720 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 regex,...
0
votes
1answer
293 views

PermError SPF Too Many Lookups and Reduction

My current SPF record is as follows: v=spf1 mx include:servers.mcsv.net include:xero.com -all The above cause the SPF validation to fail. Using http://mxtoolbox.com/SuperTool.aspx?action=txt, I ...
0
votes
1answer
244 views

Usefull to enter the same RBL's to Postfix and to spamassasin?

Does it make sense to enter the same RBL's in the postfix config under smtpd_recipient_restrictions and also in spamassasin? Would one not be enough? Thanks!
-1
votes
1answer
500 views

Postfix user is not allowed to submit mail

I am running a webserver on debian wheezy with postfix and about 3 months ago I had a major spam problem with one my domains with web21 id. I made a fresh wordpress install and everything and the ...
-2
votes
1answer
863 views

How to find the source of outgoing SPAM emails on my Server [closed]

Hello this is my first time here. I do know a little about linux but I can't seem to find out the source of tons of SPAM emails being sent out on my server. Here is a small portion of the QMAIL ...
-2
votes
1answer
216 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 ...