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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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 ...
2
votes
2answers
161 views

All External Mail to Office 365 Fails SPF, Marked as Junk by EOP in a Hybrid Deployment

In short: legitimate emails are landing in Junk folders as EOP (Exchange Online Protection) stamps email messages as junk (SCL5) and SPF-failed. This happens with all external domains (e.g. ...
0
votes
1answer
26 views

Server is blacklisted on Cloudmark but EXIM logs showing no evidence of outgoing spam

My server is getting the following warning when sending email SMTP error from remote mail server after initial connection: 554 p3plibsmtp01-04.prod.phx3.secureserver.net bizsmtp IB103. Connection ...
1
vote
1answer
18 views

Will spamassassin’s bayes filter work if learned spam mails have *SPAM* in the subject?

When my mail setup detects that a mail is spam, it puts *SPAM* in the subject. Now I want to improve my bayes filter by training it on my corpus of spam. If I feed these thousands of mails to ...
1
vote
4answers
49 views

How to find spam email sending script on server

For last 3 months i am getting email from my hosting providers that my server is sending spam emails and today i did research on it and found that it is actually doing. I used exim to check out the ...
1
vote
1answer
3k views

Exchange 2010 email spoofing prevention

Masters, Unfortunately we got some spam mail which seems to be coming from our own domain. I found some article which all says to remove Anonymous login from internet receive connector ...
18
votes
7answers
9k views

Why do 'hackers' setup bots repeatedly fill out web forms?

There is something I don't get, one of my web apps has a small form that allows you to enter you name and email address to "subscribe" to a user list for a site I maintain. The site is very low ...
-4
votes
1answer
44 views

How to detect which PHP script is sending SPAM [duplicate]

A php script is sending tons of emails. I want to detect what is the source. All emails are sent by the use www-data which the user used by apache. When I check process, I have this result : www-data ...
-2
votes
0answers
23 views

Exchange 2013 Incoming email not received with Anonymous Users Disabled

I have a Exchange 2013 server deployed in my Active Directory network that fails to allow incoming email from outside the domain when 'Anonymous Users' is turned on from the Receive Connector in EAC ...
-2
votes
0answers
25 views

Exchange 2013 Receive Connector Scoping and Open Relay

I have an Exchange 2013 server which was a victim of spam infiltration, and the exchange server was being used as an open relay for unauthorized users (and domains) to remotely send spam. I have done ...
-3
votes
0answers
20 views

Exim emails being recognized as SPAM [duplicate]

I have been running a VPS for the past two months which is currently hosting corporate email and a work-in-progress website. Emails are being sent from this server via exim but major email service ...
-1
votes
1answer
61 views

Block outgoing emails from Postfix from non-existent users

I'm getting spam sent through my server. The sender names are always random, but always in the form randomname@mydomain.com. I've tried adding reject_unlisted_senders to the ...
0
votes
0answers
13 views

Prevent email from [duplicate]

I have my own email sub-domain which I use to send my clients email invoices and announcements. I rarely use the email to conduct any marketing to the outside world, so it's the same 2-3k clients that ...
1
vote
0answers
15 views

How To Stop Apache Logging Client Denied By Server Errors [duplicate]

I get an annoying amount of spam traffic from the Ukrane, Russia, Korea etc. I have setup rules in my .htaccess file to block all of these countries and it's working great. The problem i have now is ...
1
vote
0answers
23 views

Do spam filters work if I use a forwarding address?

I made the mistake of replying to a linkedin connection request with my main forwarding email and have started getting spam after years of no spam (have blocked linkedin requests now). I have been ...
-1
votes
0answers
18 views

new .tech gTLD : risk of email blocking? [duplicate]

I am considering the purchase of a .tech domain for a legit business. However, I am concerned about the risk that anti spam programs will block my mails, just like it is (was?) done with .biz, ...
-1
votes
0answers
17 views

Two folders on /var/www change last modified date frequently - possible rootkit? [duplicate]

I have a hacked VPS and I can't find any compromised script. They are sending emails using the internal SMTP server. However I noticed that when the email spamming starts (because it takes few hours ...
1
vote
1answer
32 views

nginx spam 404 errors

My server is spammed by multiples XXX domains, there is a lot of 404 errors in my logs and i can't find the solution to stop that. 2015/07/31 09:13:20 [error] 7070#0: *610 open() ...
1
vote
1answer
18 views

Does order of UFW rules matter?

When I first initialized my ufw, I did ufw default allow outgoing ufw default deny incoming ufw allow 80/tcp ufw allow 22/tcp Over the last week or so, I've been going through my access logs and ...
0
votes
0answers
58 views

SpamAssassin not filtering well on Mac OS X Server

I am trying to deal with an increasing number of spam messages on a server I administer. We are using Mac OS X Server and have added the following RBL Servers to the blacklisting feature in ...
1
vote
1answer
38 views

How Does DNSWL work? How can I gain better trust? [closed]

How does DNSWL work? It's clear to me when someone report a spam, but how can I gain a higher score/trust? Do some companies report "good" servers? Or will the score go up with time without reporting ...
-3
votes
1answer
53 views

Postfix - Allow emails to virtual domains but block spam?

My Postfix is set up with virtual domains. This allows people to send an email to *@mydomain.com and it'll be forwarded to my gmail account. Basically the end goal is to simply allow people to email ...
0
votes
0answers
29 views

Postfix, procmailrc, SpamAssassin letting some but not all spam messages through

I have postfix running on my server with a main.cf as follwos:- myorigin = $mydomain inet_interfaces = 213.229.80.33, 127.0.0.1 mydestination = 213.229.80.33, corunna.com, localhost, ...
2
votes
2answers
66 views

Postfix seems to send spam

I recently discovered this in my postfix-log: Aug 4 11:09:12 mail postfix/smtpd[71597]: connect from unknown[59.88.35.206] Aug 4 11:09:14 mail postfix/smtpd[71597]: Anonymous TLS connection ...
0
votes
1answer
41 views

Exchange 2010 - how to hide first hop IP from mail headers

My company has an Exchange server which forward outgoing emails to a mailhub, which has a spam filter. (user)----(company's Exchange)----(mailhub with antispam)----(the world) It happens that my ...
1
vote
2answers
72 views

Automatically rescan email with SpamAssassin after it has been received

For the past months, the amount of spam I've been receiving has been driving me crazy. Despite running SpamAssassin (with RBL checks) on my Exim4 mailserver, a lot of it has been finding its way to ...
63
votes
6answers
24k views

Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

This is a Canonical Question about Fighting Spam. Also related: How to stop people from using my domain to send spam? What are SPF records, and how do I configure them? There are ...
19
votes
4answers
2k views

What are the best methods for catching snowshoe spam?

I'm using Smartermail for my small mailserver. We've been having a problem lately of getting waves of snowshoe spam that follow the same pattern. They come in batches of 3 or 4 at a time. The ...
2
votes
1answer
50 views

ipset not being applied to iptables

I'm trying to filter out a country that keeps probing my SMTP server (CentOS6) and I can't seem to get the ipset to work out right in iptables. I downloaded that countries IP addresses from ...
2
votes
0answers
195 views

Exchange 2013: content filtering bypass

I have just completed a migration from a single Exchange 2007 to 2xExchange 2013 servers in separate sites. Mailflow is working correctly, but the anti-spam content filtering is not working as ...
2
votes
2answers
67 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 ...
4
votes
0answers
32 views

How Does Low Volume Affect (esp. live.com) Email Deliverability?

I've been sending emails for years with out any serious reputational shocks, but with low IP volumes (no bulk mail or automated transactional email), even with multiple Domain names. My Gmail ...
2
votes
1answer
144 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
votes
1answer
37 views

Spam sent from my domain after a Wordpress exploit [duplicate]

I have 2 domains on my dedicated server running debian. One of them is linked to a wordpress site, mydomain.com. I've noticed that on both my sites, lately, the performances were horrible so I ...
0
votes
0answers
19 views

Prevent Exchange Approval Assistant from sending rejection notice

I'm using Exchange Approval Assistant to screen emails with potentially dangerous attachments. Since those emails that get rejected are almost always spam I'd like to be able to reject them without ...
1
vote
0answers
10 views

Is DMARC helpful to me if I don't need reporting?

I have SPF and DKIM setup and working for the email domain I administer. The next recommended step is to setup DMARC since SPF and DKIM are both in place. What are the benefits of using DMARC if both ...
3
votes
3answers
1k views

What is the email SPF entry for sending from Yahoo!?

I have a client that is sending email from a Yahoo! Plus account as if from her own domain. Is there a way to set up the SPF record so that it covers all of Yahoo!'s outgoing servers? i.e., what do I ...
1
vote
2answers
948 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 ...
4
votes
5answers
12k views

How do I get my server off the ivmSIP/24 blacklist?

I checked my server IP using this tool: http://www.mxtoolbox.com/SuperTool.aspx It's come up on the ivmSIP/24 list. What can I do to get my IP removed from this list? I have SPF records set to ...
1
vote
1answer
34 views

exim: How to reject spam mail depending on destination domain

Currently, I have exim set up to mark spam mail, and reject spam mail with high scores, using these ACL instructions in the acl_smtp_data ACL: warn condition = ${if ...
-4
votes
6answers
3k views

Remove blacklist from spamRATS

I have checked my IP in SpamRATS and the result is the following: Standards Compliance: Does IP Address resolve to a reverse hostname... Passed! Does IP Address comply with reverse hostname ...
0
votes
4answers
871 views

Postfix 2.9 or sendmail, outgoing spam prevention (check if sender exists)

Operating System: Linux Ubuntu 12.04 TLS Context: Plesk 11.5 Utility: Postfix 2.9.6 (updates restricted by Plesk 11.5 distribution) I would like Postfix to check the 'sender' field of every ...
1
vote
1answer
62 views

SpamAssassin with dovecot-antispam training

I'm trying to get dovecot-antispam working with SpamAssassin' sa-learn. This is my Dovecot configuration: antispam_backend = pipe antispam_trash = trash;Trash;Deleted Items; Deleted Messages ...
2
votes
1answer
34 views

Can IP reputation be affected due to automatic forwarding?

I am hitting a dead wall with the support team of my email hosting provider. The IP they assigned me was blacklisted and so sending emails to AOL.co.uk end up getting rejected. After several emails ...
1
vote
0answers
63 views

New Exchanger Server installation - Email marked as spam on hotmail/outlook

New to the email hosting scene - running an Exchange 2013 box. Email is always (literally, always) marked as spam when sending out to my outlook.com account. Whereas if its sent to an email address ...
0
votes
1answer
43 views

Forward all SMTP traffic to anti-spam server except for authenticated SMTP?

Historically, we have handled SMTP traffic across a handful of multipurpose servers each with their own local spam-fighting stack. We've grown and this is no longer feasible to maintain. Now we have a ...
0
votes
1answer
36 views

Scraping log to identify emails sent to another MTA

I have a Courier MTA that seems to be sending spam. I want to scrape courier's mail.log to identify, for each mail that was sent to another MTA: The from address Where Courier got the email from ...
43
votes
6answers
74k views

How to send emails and avoid them being classified as spam?

This is a canonical question about how to handle email sent from your server being misclassified as spam. For additional information you may find these similar questions helpful: Best ...
4
votes
1answer
10k views

How to resolve problems with spf / softfail?

I'm having problems with Google rejecting mail because of SPF problems. I thought I had this fixed, but evidently not... The mail is being sent from a Drupal site running mimemail. A message that ...
0
votes
1answer
43 views

How to resolve “Domain shares an MX record (mx2.zoho.com) for a mail exchange which will not accept mail to the administrator”

I have found one of our domains on a spam list, http://rfc-clueless.org/. It states that: RFC2 is not a spam list. Each of our curated lists track compliance with specific requirements of RFCs ...