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

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4
votes
2answers
17k views

How can I track who is sending spam through an Exchange server?

I have an Exchange 2003 server that sent me an email this morning: SMTP Server Remote Queue Length Alert Looking in the queues using Exchange System Manager there were just over 16,000 spam ...
4
votes
2answers
396 views

Blackberry & SPF

Some users on my domain use a Blackberry for email. Should Blackberry's servers be included somehow in my SPF record? Thank you much for any advice.
4
votes
4answers
3k 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?
4
votes
2answers
49 views

Is it OK to run my own mail server for email forwarding? [closed]

A lot of people advise against running your own mail server; they recommend using a SAS that is more experienced in this area (Google Apps Gmail, AWS WorkMail, etc). I want to run Postfix MTA to ...
4
votes
1answer
2k views

Abnormal sendmail activity using up the server memory on my Ubuntu 12.04 server

Environment Rackspace Ubuntu 12.04 Wordpress MySql The issue I have been experiencing quite serious out-memory-issues in the last couple of days. While I resolved one possible cause the issue I ...
4
votes
2answers
2k views

Barracuda tagging email with 'date grossly in the future.'

I have a Barracuda 300. Granted it's running on some old firmware and the Energize updates are quite outdated. I'd like to update them, but, not my financial decision to do so. Starting around the ...
4
votes
1answer
362 views

Silently drop OUTGOING mails to us.er.n.a.me@gmail.com (more than 3 dots in username part)

With postfix-2.6.6-2.2.el6_1.x86_64 on CentOS 6.4 is there please a way to inspect OUTGOING mails and silently drop them (i.e. do not send them) if the recipient looks like us.er.n.a.me@gmail.com ...
4
votes
3answers
3k views

Where can I find a list of IP addresses of hosting providers?

I am attempting to fend off a spam attack against a web api I run and would like to obtain a list of IP addresses of public web hosting providers from which spammers are launching their attacks. I'm ...
4
votes
2answers
9k 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 ...
4
votes
1answer
592 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 ...
4
votes
1answer
1k 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 ...
4
votes
3answers
4k views

Google Apps BCC all Inbound and Outbound email

I am working with a company on a migration from a standard POP3 email provider over to Google Apps premier. The owner of the company currently receives copies of all INBOUND and OUTBOUND email into ...
4
votes
1answer
2k views

Server Sending Spam?

We have some servers hosting websites and email accounts for clients. Today we found that one of our servers has a very heavy load and by looking at the maillog it is doing a lot of sending to ...
4
votes
1answer
4k views

Forefront Protection for Exchange - Allowed sender still delivered to Junk Mail

I've got a fresh install of Server 2008 R2 SP1, Exchange 2010 SP1, and Forefront 2010 Protection for Exchange. All on the same box, Exchange is CAS/Hub/MBS. This is a testing box, looking to evaluate ...
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
4answers
541 views

Spam from my server [closed]

I have exim and dovecot on my server installed with directadmin. Some users use it to send spam. How can i disabled this and remove my server from abuse. info from mainlog 2010-07-07 13:00:16 ...
4
votes
1answer
342 views

Indirect Postfix bounces create new user directories

I'm running Postfix on my personal server in a data centre. I am not a professional mail hoster and not a Postfix expert, it is just used for a few domains served from that server. IIRC, I mostly ...
4
votes
0answers
80 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
1answer
346 views

Will Amazon SES improve spam filtering through typical spam filtering packages

We built web applications which create a fair amount of transactional emails, such as tickets, reminders and logging messages. These emails are typically sent to end users, but most of them are also ...
4
votes
2answers
5k views

How to read the “MS ForeFront” antispam report in email header?

I'm trying to diagnose why emails I'm sending out from my server's IIS SMTP Pickup Folder are getting bounced back occasionally. One tech from a receiving company who couldn't receive the emails ...
4
votes
1answer
5k views

Exchange 2003 mail non-delivery (NDR), spam activity? events 7002 & 7004

Windows Server 2003 Small Business Server SP2 Exchange Version 6.5 (Build 7638.2: Service Pack 2) This network has been neglected and has been having email problems for years and was on many ...
3
votes
4answers
662 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 ...
3
votes
4answers
453 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 ...
3
votes
7answers
10k 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 ...
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
1answer
846 views

How did this email bypass my SPF settings?

I received a phishing email this morning that appeared to come from one of my addresses to itself. Looking at the headers, I found something interesting. DomainKey-Status: no signature ...
3
votes
2answers
1k 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: ...
3
votes
2answers
169 views

What do these email newsletter services do to prevent their emails from going to SPAM folders?

These email newsletter services probably send millions of emails per day. How do they successfully do this without having their system black listed? Don't services like otmail/gmail block emails if ...
3
votes
2answers
2k 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.
3
votes
5answers
820 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. ...
3
votes
2answers
535 views

Is someone using my mail?

I found a whole bunch of this in my maillog (after my site went down from excessive resource usage): Dec 3 05:24:23 mysite qmail-queue-handlers[24524]: from=anonymous@mysite.com Dec 3 05:24:23 ...
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 ...
3
votes
3answers
640 views

Postfix and compromised accounts

First of all, sorry for my English. I think it's very common to set the permit_mynetworks and permit_sasl_authenticated restrictions on first positions of the smtpd_recipient_restriction list, but, ...
3
votes
4answers
478 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
3k 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
1k 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
6answers
9k 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
3answers
1k views

How do you configure sendmail to reject Email with a Date header too far from real time?

A friend of mine using (I believe) qmail has it configured to reject, as SPAM, any incoming Email with a Date: header that is too far from real time. I can't figure out how to do this with sendmail. ...
3
votes
2answers
22k 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
312 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
2answers
592 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
5answers
1k views

How to configure email server to send lots of transactional emails

My organization is currently outsourcing email delivery to an SMTP service provider. We're considering bringing that back in house to deliver our own emails. We send about 5k transaction emails per ...
3
votes
1answer
8k 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
2answers
2k 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
274 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 ...
3
votes
2answers
76 views

Understanding exim4 outgoing message logs. Am I a spammer?

Today I got many spammy emails into my mailbox, I looked in exim4 logs and I found some suspected activities. I would like to understand the serverity of this attack, if I got spammy mail I can ...
3
votes
1answer
2k views

Log with iptalbes which user is delivering email to port 25

Because we got blacklisted on CBL I set up the following firewall rules with iptables: #!/bin/bash iptables -A OUTPUT -d 127.0.0.1 -p tcp -m tcp --dport 25 -j ACCEPT iptables -A OUTPUT -p tcp -m tcp ...
3
votes
1answer
905 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
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
6answers
6k views

Hotmail and Live.com rejecting all emails [duplicate]

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. ...