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

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3
votes
1answer
799 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
181 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
2k 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
3k 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
2answers
342 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.
3
votes
5answers
220 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
2k 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
87 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 ...
3
votes
1answer
358 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
312 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
888 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
316 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
0answers
42 views

Is there a way to get spamassassin to score the top lines of a message body more heavily?

A lot of spam is getting through the filter on the mail server I run with the relatively simple trick of starting with few lines of (incredibly obvious) weight loss or other scam text at the top, ...
3
votes
2answers
424 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
65 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
161 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
9k 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
427 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
167 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
6k 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
311 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
249 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
1answer
183 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
4k 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
2answers
178 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
726 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
283 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
2answers
787 views

IIS7 ban IP range [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? I have a list of IP ranges I would like to ban, an example being: 119.30.47.xx Where xx is anything. I've added the domain and IP ...
2
votes
4answers
230 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
470 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
2answers
1k views

Delete from mailq where subject matches

I have a mailq which is getting backed up with multiple emails with the same subject line. I would like to delete all emails in the mailq that match a particular subject line so they don't get sent. ...
2
votes
3answers
282 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
823 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
931 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
272 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
555 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. ...
2
votes
6answers
4k views

how to track down a spamming script?

My server sent 83,000 spam emails last night, I've been trying to track down the culprit, but I'm not sure how to find out exactly. in the logs the "from" address is always something like @#! the ...
2
votes
4answers
765 views

Best practices on how to send emails on clients behalf and avoid being black listed

I am starting a business providing some online customer relationship management functionality. I want to allow my clients to create their own email lists. I also want to allow my clients to be able ...
2
votes
2answers
375 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
3answers
767 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. ...
2
votes
2answers
16 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
1answer
76 views

What to do with a denounced IP?

I have a VPS and I use it as a personal email and web server. Although there are some other domains hosted on it, the number is less than 5. From the start, I wasn't able to send emails to Gmail or ...
2
votes
2answers
161 views

Barracuda Spam Filtering & Bayesian Learning

I came across best practices from BarracudasNetwork website https://www.barracudanetworks.com/docs/other/barracuda_spam_&_virus_firewall_bayesian.pdf These recommendations suggest to keep good ...
2
votes
4answers
135 views

Worth deleting email account due to SPAM?

We have a system here in which several accounts get a ton of SPAM and spamd (SpamAssassin) is constantly using a ton of memory. Our machine is used for both our website and our email. Our LAMP based ...
2
votes
1answer
429 views

Why would messages in Exchange 2010 R1 with 0 SCL scores end up in Junk Mail folder?

We have Hub Transport rules that mark e-mail messages with a 0 SCL score if they meet certain criteria. However, some messages that should be caught by these rules are still ending up in the Junk Mail ...