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

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2
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2answers
181 views

Fixing Poor Email

I'm having an issue with SenderBase. My IPs are not blocked in any BLs but people who use SenderBase/Ciscos stuff do not get my emails. Is this because my email system is setup poorly? They list the ...
2
votes
4answers
331 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
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
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
772 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
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
2answers
535 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 ...
2
votes
3answers
306 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
1k 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
1k 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
819 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
6k 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
3answers
1k views

Can any postfix guru assist me determine how emails are still being sent via my server from unauthorized sources?

I'm getting a little concerned as I run a small server hosting a number of websites and manage the email for a few dozen people. Just recently though I've had a couple of notifications from spamcop ...
2
votes
4answers
968 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
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
2answers
241 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
2answers
114 views

Spam mail forwarded through my server using valid user

I am getting "Undelivered Mail Returned to Sender" messages. The relevant mail messages are being forwarded using a valid user (mike@proactech.com) on my server (server1.nbicharts.com). I control ...
2
votes
2answers
2k views

Postfix & Amavis - Use UNIX Soket for Communication

I currently using a complex mailserver setup using Postfix, Dovecot, Amavis and Spamassassin. Everything works fine but I want to improve the Postfix-Amavis-Communication. At the moment, postfix will ...
2
votes
2answers
901 views

How to remove all messages from exim mail queue from a certain user/email

I've spend the last hour trying to figure out how to delete all messages from a certain mail address from the exim mail queue, after the queue was full of spam emails.
2
votes
1answer
79 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
393 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
150 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
491 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 ...
2
votes
1answer
316 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
1answer
118 views

Managing an email server - what steps can I take to ensure our emails are delivered

We have developed some CRM software which allows the users (our clients) to send emails to their clients (both individually and as a bulk email-out). The emails are sent via our email server, but ...
2
votes
3answers
4k views

Exchange 2007 Delivery Delayed (maybe need certificate?)

Last week, I setup a new domain and Exchange Server 2007 SP1. I created new accounts and mailboxes for my 30 users and imported all mail from their old domain to this new server. It's a Hub Transport ...
2
votes
2answers
7k views

dspam vs spamassassin vs bogofilter [closed]

I just wonder what their pros and cons are, and which is better for production use. Thanks~
2
votes
4answers
279 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
1answer
3k views

Is there any way to see why Outlook's client junk mail filter is marking a message as spam?

I have some users running Outlook 2007 connected to an Exchange server, and they're complaining about mail ending up in their junk box. There's no X-SCL tag in the mail headers so this filtering must ...
2
votes
1answer
30 views

letting anonymous users use a form to send emails as if it is from their own mailboxes without getting flagged as spam

I am working on a project for an environmental NGO. They want to let users use a form on their website, provide their name, their email address and select certain emails from a list to send complaints ...
2
votes
1answer
44 views

SPF “include:” does MX stay as included domain's MX, or get translated to the includer's MX?

SPF records allow you to include another's domains SPF record within your own. For example, example.com can have include:_spf.google.com in its SPF record to include all of the SPF rules for _spf....
2
votes
2answers
43 views

What's the purpose of spammy HTTP referers?

In the logs of my website, there's a lot of visits with a HTTP referer set to spam-like websites (usually Russian sites, I've noticed). I assume what they're doing is just using a web crawler to visit ...
2
votes
1answer
317 views

Hotmail/Outlook dumping apparently valid emails

I've written some software that operates a non-commerical contact list for clubs, where the server sends out admin mails to the entire club. The emails are received Ok on Yahoo, gmail, and AOL, but ...
2
votes
2answers
338 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 ...
2
votes
1answer
259 views

Which E-Mail software generates these spammy mails?

I notice a lot of spammy looking e-mails from suspicious sources. They are not real spam but are unsolicited. You can identify them by containing these headers: X-Mailer-LID: 5 List-Unsubscribe: <...
2
votes
1answer
132 views

How easy is it to sniff the SMTP port of webserver to capture mails

I've got a very basic question that I don't know the answer for. Our company owns a webserver that runs multiple websites and works as a mail server for these websites as well (e.g. to send contact ...
2
votes
1answer
4k views

How to stop double-bounce FROM sender in postfix

I am getting huge amount of these in my mail log, and unable to find its originator. What could be the reason? Here is log entry: postfix/cleanup[9626]: 4413082E40: message-id=<20140220102521....
2
votes
1answer
212 views

Iptables rules order

I have following script, which I found somewhere in the Internet, and I modified it a little bit to suit my needs. My question is: If I understood output of iptables-save my iptables rules are ...
2
votes
1answer
4k 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: ...
2
votes
1answer
447 views

Mail Server on Google Apps, Hotmail Blocks

My company provides private research tools (sites) for companies. Each site has its own domain name and users. These sites need to be able to send outbound mail for notifications such as password ...
2
votes
2answers
193 views

Domain name in email body considered spam

I had a customer domain who got their password compromised and spam was sent from their email account with links back to drive-by files that had been uploaded to their web space. The server ended up ...
2
votes
1answer
200 views

Will using google apps emailhosting get rid of blacklisting caused by a shared server account?

a client`s email addresses are constantly blacklisted due to other users who share the same server. the hoster does want him to switch to his own dedicated server, so he gets his own ip. my question ...
2
votes
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 ...
2
votes
3answers
3k views

Make Exim send bounces to postmaster instead of the sender, for non-local sender

I have a few e-mail aliases that forward to external hosts. Currently, if the external host rejects a message, Exim generates a bounce message and sends it to the original sender. This is bad because ...
2
votes
1answer
175 views

Sending email from specific vhost, bad for spam?

Essentially, I have a server that contains many vhosts. One vhost in particular is required to send mail from the address invitations@vhost.com, however the reverse DNS for that server resolves to ...
2
votes
1answer
181 views

Set up a Fax server to filter spam

At my work, we have a huge costly multi-function printer that does everything a printer can dream of. It is hooked up directly on a dedicated fax telephone line. Now we receive an increasing amount of ...
2
votes
1answer
817 views

How do I manage multiple mail store servers?

I have a mail server for a domain foo.com. Currently all users’ mail box is also in the same server. Now my office is starting its operation in multiple Countries. How can I have mailbox store of the ...
2
votes
4answers
283 views

What is the best way to deal with spam or virus infected hosts in wireless network with personal laptops?

What is the best way to deal with spam or virus infected hosts in wireless network with personal laptops (like personal students laptops in university)? What polices and tools use your company?
2
votes
1answer
2k 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 ...
2
votes
1answer
167 views

ejabberd: prevent the use of messages with subject by spammers

Recently there have been noticed a sudden surge in Jabber/XMPP spammers activity. Spammers not only manage to send a regular messages to users, like this: but also a some kind of announcement ...