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

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2answers
952 views

How to detect and prevent postfix from dishing out spam email from compromised mail account

We host email and websites for numerous customers on a dedicated server running CentOS and configured through Virtualmin. Email is handled through Postfix. Over the weekend we noticed that a clients ...
0
votes
1answer
82 views

Sendmail's MTA, MDA and SMTP 550 User Unknown forwarded to postmaster

I have two boxes running sendmail and configured as: MTA accepting connections from the outside world (mta.xyz.com) MDA accepting connections from internal network and storing them in user mailboxes ...
8
votes
1answer
176 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, ...
-1
votes
1answer
42 views

Configure sendmail to reject emails without from addresses

My MTA is receiving lots of emails with no from address specified, for example: Sep 15 17:09:57 mta1 sm-mta[46864]: STARTTLS=server, relay=mx01.aquila-capital.de [83.236.242.254], ...
1
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2answers
253 views

Spamassassin filter systematically produces negative (ham) scores for spam messages

I have problem with lots of spam. My server setup is VPS with CentOS 6.5 and Dovecot+Postfix+Spamassassin. Here is source of one of the messages: Return-Path: <nancy_mitchell@tagbook.co.nz> ...
0
votes
1answer
34 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!
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1answer
45 views

Sending emails on behalf of our clients

We wan't to send emails on behalf of one our customer. Previously we were sending those emails using our email address. But last two times we got blacklisted in SORBS database (probably because of one ...
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votes
1answer
56 views

Automated blacklist checker [closed]

Has anyone used any of these services and if so, is there one you can recommend? Ideal target would be for an MSP so perhaps would like real time alerts if an IP shows up on blacklist for perhaps ...
1
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1answer
2k views

Mailscanner and amavisd-new comparison

I'm going to implement a mailfiltering gateway for my company. I'm going to use Postfix, with a PostgreSQL back-end. The question would be: how to best implement the antispam measures. Mailscanner ...
1
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1answer
403 views

Reject emails with many To/Cc recipients with exim ACL

I'm having a problem with emails with many (>20) To or Cc recipients being sent trough my mailserver. Worse these are mailing-lists so reach hunderds of people. People then reply-all causing ...
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votes
1answer
24 views

spam email forwarding by server [closed]

Let's start with this scenario: We have a mailbox (i.e. in yahoo), every message is sent by this account, marked as spam by Gmail spam filter. (because the address or sender IP is blacklisted, ...
2
votes
4answers
447 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 ...
2
votes
1answer
51 views

Training a spam filter based on Mailman moderator's actions?

I'm planning a Mailman server, and looking for a good way to enable list moderators train a spam filter (likely to be either spamassassin or dspam). Has anyone come up with a good way to run training ...
1
vote
1answer
85 views

Postfix message ID originating process?

Last night my postfix mail server(Debian Squeeze with dovecot, roundcube, opendkim and spamassassin enabled) started sending out spam from a single domain of mine like these: $cat mail.log|grep ...
-1
votes
2answers
225 views

GMail detecting mail as spam [duplicate]

I've been trying for a long time to get our company's mail server send mail that will get accepted by the GMail spam filter. I have managed making it work for Yahoo Mail and Hotmail, sadly GMail is ...
7
votes
3answers
4k views

SMTP message rate control on Ubuntu 8.04, preferably with postfix

Maybe I am chasing a bug but I am trying to set up a smtp proxy of sorts. I have a postfix server which receives all the email for a collection of servers/clients. It them uses a smarthost ...
0
votes
1answer
31 views

Spamassasin: Check mailbox for spam

How can I have spamassasin check a mail folder for spam and move it into a different one. I've been getting a lot of spam recently and started implementing bayesian classifiers. I moved a bunch into ...
-1
votes
1answer
97 views

Can't figure out how to properly setup SPF record [duplicate]

I have a Django web app and I use Django's email backend to send out emails. I can't figure out why emails are ending up in spam folder. My domain host is GoDaddy so I added a TXT record ...
-1
votes
2answers
673 views

Use postfix and spamassassin packages on CentOS 6 to reject SPAM - without custom users and scripts

Here is what I'm trying at my CentOS 6.5 Linux server: Installed postfix and spamassassin packages Configured Postfix - it works well (I omit details here) Added -x to the SPAMDOPTIONS in ...
0
votes
1answer
83 views

Postfix acting as spam server. Looks like it's part of a botnet, spam messages being sent to customers [duplicate]

Let me first start out by saying I am no mail guru. If you need more info to help me just let me know. This week the mail server has been having all sorts of strange issues. It has been duplicating ...
0
votes
1answer
157 views

How to find out where mystery SPAM scripts are coming from?

I am the datacenter manager at a small ISP and we have been having an issue with mystery scripts sending out SPAM on our server. These PHP scripts will appear mysteriously in /tmp as well as sometimes ...
1
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1answer
99 views

Spam - individual user

I have a bit of an issue with a users inbox in that a lot of spam is getting through for him alone. We use Amavis/Postfix and SA in our mail setup. Config setup like this: Config: ...
0
votes
1answer
725 views

postfix smtp_get: EOF

I'm using postfix (incomming port 25) + SpamPD (127.0.0.1:10025 relayhost:127.0.0.1:10026) for filtering incoming email, which are coming from internet for my remote MTA. MTA which holds virtual ...
-4
votes
1answer
38 views

No way to create an effective spam filter [duplicate]

We are having a big spam problem and we don't know how to resolve it. We have one spammer that send us mail daily. All these emails are from different themes, using different email addresses that are ...
0
votes
1answer
41 views

How do I block a user doing too many requests without blocking an entire organization?

We have a running website and some of the content comes from a paid API. Our website is free. Our main concern at the moment is people using our website as a "free" way to get at the underlying data ...
0
votes
4answers
1k 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
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1answer
98 views

Spam Traffic, DDOS Attack & Server Crashing

I am running phpfox application in my server under my main domain name fetlock.com and I am getting large amount of spam and also suffering from DDOS attacks from multiple IP addresses. My server ...
0
votes
2answers
855 views

Server sending spam, Im unable to catch the user

Alright, I'm tired of spam being sent out from my server. I've installed CSF as a firewall and it keeps on saying Local Host Relay for user 127.0.0.1 Received: by 10.50.183.228 with SMTP id ...
0
votes
1answer
24 views

SpamAssassin doesn't filter forwarded mails

I am forwarding emails from an external email account to an account on my own server. SpamAssassin works fine if I just receive mail normally. But all mail thats being forwarded from my external mail ...
0
votes
1answer
300 views

Our outgoing emails from a shared hosting provider (Bluehost) are returned because the server is listed as SPAM SERVERS

I am getting very frustrated with this web hosting provider -- Bluehost.com. We have several small business sites hosted with them. We also use email accounts provided by the Bluehost for our outgoing ...
2
votes
1answer
752 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: ...
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votes
1answer
126 views

Prevent postfix sending spam from fake local address

I have an email server Postfix (not open relay) filtered with ASSP (filter incoming mail/connection), but some spammer is sending tons of spam using my email server by using fake local address. This ...
1
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2answers
277 views

exim4 reveals a mail alias when remote server rejects spam

I'm running exim4 (4.76) on Ubuntu 12.0.4.4. exim4 is set up to handle mail for mydomain.com. I have aliases set up that forward a@mydomain.com to b@gmail.com. I have SpamAssassin set up to work in ...
0
votes
1answer
52 views

How do I get Ingo to provide sieve rules suitable for use with DSPAM?

Using the Ingo web gui which is part of horde, I can set up sieve rules that get written to file like so: # Junk-Review if header :comparator "i;ascii-casemap" :regex "X-DSPAM-confidence" ...
7
votes
4answers
11k views

How does a Reverse DNS lookup work with regards to spam filters?

I have heard that most spam filters use a reverse DNS lookup on the originating IP address of the sending SMTP server (or something like that) as part of the verification process. I want to make sure ...
0
votes
0answers
77 views

Forwarding email through a dummy relay to avoid blacklisting

I have a mail server that allows individual users to forward mail to other providers. The server performs the usual anti-spam checks, but spam still gets through occasionally -- especially with the ...
-2
votes
2answers
356 views

ubuntu postfix send mail marked as spam [duplicate]

I set up a mail server, when I give Gmail to send test message is marked as spam system: ubuntu + postfix + dkim + dk + spf + ptr This is the message header Delivered-To: test@gmail.com Received: ...
1
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0answers
78 views

Spamassassin && Exim: redirect spam emails

I want to redirect all email, being marked as SPAM to special mailbox. Works with Exim4, SpamAssassin Server version 3.3.1 on CentOS 6.5. Rules from Exim in acl_check_data block: warn message = ...
0
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2answers
83 views

Error sending emails from a mail server relay type falling into the spam folder (using postfix)

Here I show one of the emails that come to Yahoo, which are falling directly into SPAM folder. The SPF goes smoothly, the DKIM passes without problem, even DMARK passes without problem, but just keep ...
1
vote
1answer
233 views

Server sending spam - how to find out why?

I have a CentOS 6 on a dedicated server. I'm the only one with shell access to it. I host 2 Wordpress and few simple PHP sites there. My hosting company just emailed me that they blocked my port 25 as ...
1
vote
2answers
100 views

Quick/safe way to mass delete SPAM messages from 100+ inboxes

Looking for a way to delete all messages from particular senders out of every affected users mailbox, typically 100-200/10,000. When I approached our Exchange admins about this idea I was met with ...
0
votes
2answers
63 views

Prevent abuse of sendmail for spam

In web servers that host many websites there is always the possibility of a hacked site being abused in order to send spam mails with some kind of php mailer bot. In my case sendmail is configured ...
0
votes
3answers
193 views

postfix sending newsletters as spam to the receivers [duplicate]

I have some problems with my postfix setup. We send newsletter regulaly to our customers once or twice a week. and we have expierenced that many customers do not get their emails, it's simply because ...
0
votes
2answers
483 views

Postfix and Dovecot Sieve spam filter does not work

CentOS 6.5 x64 I'm trying to apply a Sieve filter to my mailserver (Postfix + Dovecot + Spamassassin) to automatically move spam mails to my Junk folder. I've added sieve to my ...
0
votes
0answers
18 views

It's possible to have a Distributed Bogofilter database?

We've Bogofilter running on our AntiSpam system and I would like to distribute it's database through the two MX gateways that we have. I know it's possible using SpamAssassin with a shared MySQL ...
10
votes
2answers
678 views

How can I reduce the damage of stolen mail accounts?

Currently I’m offering some webhosting to a few advertising agencies for their premium customers. But currently I have a great problem with the E-Mail Service. In the last week, the E-Mail Accounts of ...
0
votes
0answers
40 views

Global Inbox Rules in Exchange 2013

There's a way to create global inbox rules in Exchange 2013? I'm not referring to the Transport Rules, because it does not perform what I would like to. It would be nice to force a Inbox Rule, ...
0
votes
0answers
126 views

How to send emails without ending up in Junk/Spam folder

I have installed a mail server in order to send e-mails using my own domain name. I've read many articles about how not to end up in Junk folder. I have done what those articles said: Added MX ...
2
votes
0answers
69 views

Restrict IMAP access for a given account to only one IP address in Exchange 2013

I've created a "spam crawler" account with full access to all mailboxes in an Exchange 2013 environment to get messages in the junk folder to feed the Bayesian filtering running on SpamAssassin in a ...
1
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1answer
750 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 ...