All Questions
83
questions
0
votes
1
answer
99
views
postfix sending only short messages ( emails ) but not long messages?
when I am sending a short email from "[email protected]" or any other email acc , the message is received well in the inbox of Gmail , hotmail etc , but if I send the message again with long ...
- 209
0
votes
2
answers
201
views
Spammers are using my mail server to send out emails
Lately spammers are using my mail server to send emails to different addresses.
For example, a colleague of mine received an email that was supposedly self-sent (it was not).
Looking at the ...
- 1
-2
votes
1
answer
265
views
Identifying the spam source on my Centos6.9 smtp sendmail server
The server has also httpd with PHP services running
I did read the guide here: https://a1websitepro.com/find-track-filthy-spammer-block/
I did install EXIM
My client complains they never had this ...
- 109
1
vote
0
answers
2k
views
Linux history filled with priv_escl_start and _end after security changes
We are going through a process to make our linux servers more secure following a scan. I notice that on some of the machines, we now have lines like:
LANG=C; printf "priv_escl_start_%s" "[random 8 ...
- 79
0
votes
1
answer
112
views
Drop newsletter emails with Postfix
There is an option, i have seen in Fortimail, that makes you able to filter/drop all newsletter emails.
I don't understand how Fortimail detects these type of emails.
And I am keen to know whether ...
- 773
0
votes
0
answers
707
views
How to block email if sender doesn't match reply-to address? [postfix]
Currently our company is getting more and more spam. For a small company we had to block all incoming spam from chinese IPs, which blocks around 500 spams per week which is alot, as we're a local ...
- 131
0
votes
0
answers
726
views
My postfix server rejects my python script - "Client host rejected: cannot find your hostname"
I have a postfix on a server. When I'm trying to send an email from my python script, it gets rejected due to "Client host rejected: cannot find your hostname".
How to allow an email come through? If ...
- 1
2
votes
2
answers
2k
views
Outgoing spam on Postfix without any X-PHP-Originating-Script header
A lot of spam is sent from my server, using real Email addresses, which I find strange as normally, fake addresses are being randomly used. Also, I would normally find a X-PHP-Originating-Script ...
- 77
0
votes
1
answer
431
views
Got an Abuse email for spam from my server, but postfix logs don't show them [duplicate]
We have a server with 300+ websites on it, and it has gotten an abuse letter from spamcop. We have investigated the logs, and searched for the PHPMailer version stated in the mail and all came up with ...
- 181
0
votes
1
answer
936
views
Postfix sending spam from unknown user
I have a Postfix mail server.
The problem is it is sending spam. The logs showed the following:
538ED2BF7F2: client=unknown[103.214.xxx.xx]
538ED2BF7F2: message-id=<>
538ED2BF7F2: from=<...
- 202
0
votes
1
answer
834
views
Postfix check ip and dns for junk mail
These days I am receiving emails that contain links to temporary cloud that will surely contain malware. The only thing I notice strange to be in the header of the email is this:
Received: from mx.y....
- 1
0
votes
4
answers
1k
views
How to track scripts that are sending SPAM?
Our server is hosting multiples websites for different clients.
The hosting provider has blocked the port 25 after detecting that our dedicated server is sending spams.
I have checked Qmail logs but ...
- 211
0
votes
0
answers
491
views
gmail marks my mail as spam [SPF:pass,DKIM:pass,DMARK:pass;rDNS;pass]
I am trying to deploy my mail server with postfix but mails to google are always sent to spam.
I know this question has already been answered on another topic but I didn't find an appropriate solution ...
- 121
-4
votes
1
answer
75
views
EL5 /etc/hosts.deny not denying ".top"? [closed]
I get spam e-mails from places such as [email protected]
among a LOT of others.
I have an appropriate entry in /etc/hosts.deny but it doesn't seem to
block anything from the .top domain. ...
- 9
1
vote
0
answers
288
views
Stop Postfix from forwarding spam
I have a personal Postfix mail server set up that has been working fine for years. It's not very busy. A bunch of smtp_*_restrictions help it fight spam -- not a lot of spam gets through anymore. I ...
- 163
0
votes
1
answer
489
views
Exim server maillog are flood by spam attemps? [closed]
My log is flooded with those spam attemps and I wonder if there is a ACL can stop those attemps.
maillog (this is just a sample, my log will be over a 1000 line in an hour)
2016-07-09 22:00:32 [...
- 185
0
votes
1
answer
696
views
Outgoing spam from postfix using my domains
I get a lot of spam outgoing from my server which uses fake emails but real domains (that are hosted on my server Linux Debian Squeeze). These all have "msg" plus a random number as Email address. ...
- 77
1
vote
0
answers
122
views
Exim restrict send emails only from predefined list of emails
I use Exim MTA. I need to restrict hosting (lamp) send emails only from predefined list "From:" emails per user to prevent massive spam if website was hacked.
Users use php to send emails via builtin ...
- 11
0
votes
1
answer
878
views
Postfix sending spam to local email addresses without authenticating
Running on Centos 6.4. Past two weeks I've been receiving emails from other email accounts located on our server. [email protected] is sending to [email protected] and [email protected] is sending ...
- 345
1
vote
0
answers
152
views
Postfix send SPAM
I come a few days being listed in the Spamhaus CBL. CBL list reports that I have a virus on the network and that is sending emails as "localhost.localdomain". I do not know where to be coming this "...
- 31
-1
votes
1
answer
276
views
My server mail going junk in hotmail and yahoo [duplicate]
All my server mails going to spam in hotmail and yahoo. Here is my full mail source. Can any one please help me to sort out this issue ?
x-store-info:4r51+eLowCe79NzwdU2kRyU+pBy2R9QCDI9u8Kc1Jen/...
- 1
1
vote
2
answers
785
views
Is my Postfix sending spam?
In my Rsys log I am getting weird email requests that are not initiated by my server:
Nov 17 09:32:18 localhost postfix/qmgr[21748]: 8E52272C09: from=<>, size=33770, nrcpt=1 (queue active)
Nov ...
- 183
0
votes
1
answer
111
views
Lot spam from unknown source
Here is the email header and info that I got from aol abuse. This type of emails are being generated from my server randomly at a very low rate and IP is blacklisted very freuqently. After 2 weeks of ...
- 4,319
0
votes
2
answers
255
views
Tracing down spam
How can I find the source of out going spam on a linux server?
tail -f /var/log/exim_mainlog
2014-10-24 15:02:37 [28750] 1Xhl4A-0007Te-9C Completed QT=7s
2014-10-24 15:02:37 [28746] SMTP ...
- 3,941
0
votes
1
answer
556
views
Plesk 12 Linux Server Mail Spam Issue [closed]
I'm running multiple websites on my dedicated server, and for one website in particular where users signup and then must verify their email address, I'm getting reports from my client that a small ...
-1
votes
1
answer
2k
views
How to find the source of outgoing SPAM emails on my Server [closed]
Hello this is my first time here.
I do know a little about linux but I can't seem to find out the source of tons of SPAM emails being sent out on my server.
Here is a small portion of the QMAIL ...
- 19
-1
votes
1
answer
2k
views
Postfix user is not allowed to submit mail
I am running a webserver on debian wheezy with postfix and about 3 months ago I had a major spam problem with one my domains with web21 id. I made a fresh wordpress install and everything and the ...
- 3
1
vote
1
answer
1k
views
what user is sending emails from mailq
I have a debian box with postfix on it.
I checked the mailq and I do not understand how to read the mailq.
I need to know witch user is used to send this emails.
here is a example
0F87797868C ...
- 347
5
votes
1
answer
18k
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....
- 4,319
3
votes
4
answers
916
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 ...
- 953
0
votes
1
answer
1k
views
What do I need to be able to send mass SMTP email efficiently? [closed]
I am creating a web application that allows users to send broadcast emails to a list of subscribers. Essentially, it's a mass emailer and autoresponder, like AWeber or Constant Contact or MailChimp. ...
0
votes
2
answers
705
views
Postfix spam flood from my network
I have some issues with my postfix server. Recently it started sending spams, but only in my local network, since open relay has been closed, only allow to my network. I've tried a lot of solutions ...
- 127
1
vote
1
answer
1k
views
Reverse dns for web/mail server with single ip
I have a single server with single ip running a web server, mail server and bind (all for a single domain).
In my DNS zone file I created A records for www.domain.com, mail.domain.com, ns.domain.com ...
- 133
-1
votes
1
answer
634
views
Using Spam Assassin as email proxy
I'm looking to setup a Spam Filter Proxy for my clients, not too many mind you, and have it as transparent as possible.
I read about SAVASM and Spam Vigilante, and while they are perfect I guess for ...
- 367
2
votes
1
answer
412
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 ...
- 492
2
votes
1
answer
649
views
how to block network level mail spammer?
Here is the packet capture of how the attacker is coming to my server and generating Huge amount of spam, i am not able to block it by any means.
220 mta1497.mail.ne1.yahoo.com ESMTP YSmtpProxy ...
- 4,319
0
votes
2
answers
2k
views
Server compromised. Bounce message contains many email addresses message was not sent to
This is not a dupe. Please read and understand the issue before marking this as a duplicate question that has been answered already.
Several customers are reporting bounce messages like the one below....
- 194
1
vote
1
answer
1k
views
Postfix server begins send spam immediately after starting
I've installed a postfix server on a debian OS & also I've installed apache 2.0 with PHP on same machine.
Several days ago my server begun to send a lot of spam messages via postfix. I understood ...
- 325
3
votes
1
answer
88
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 ...
- 135
8
votes
3
answers
11k
views
Send spam mail to a special folder using postfix
I have a postfix server running amavis and SpamAssassin to help filter spam. Messages that are detected as spam look like this when delivered into the user's Maildir:
From tom@tom-mint Fri Mar 15 01:...
- 2,156
0
votes
1
answer
9k
views
Plesk 11 Set firewall rules manually [closed]
I have a big spamming problem on my site from ip addresses coming from Asia. My website is designed for people in France and Canada, so I want to block all ip addresses from Asia to avoid spam. I ...
- 141
1
vote
4
answers
10k
views
smtpd_helo_restrictions = ..., reject_unknown_helo_hostname occasionally rejects mail I care about, how to handle?
I have configured my postfix as follows:
smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unknown_helo_hostname
This is working well because most spambots don't seem to ...
- 796
-1
votes
2
answers
189
views
All Details of a Running Process [duplicate]
Possible Duplicate:
How do I deal with a compromised server?
This process is running on my Linux server and is sending spam (connecting to port 25 and port 80 with random IP's).
top - 12:28:42 ...
-3
votes
1
answer
616
views
Blocking unsubscribe spam
I have SpamAssassin turned on and using RBL in the WHM control panel using the lists from spamhaus. However, these type of e-mails are getting in. Are there any ways to stop them?
Example of the e-...
- 1
5
votes
1
answer
6k
views
Log with iptables 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 -...
- 157
2
votes
2
answers
232
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 ...
- 6,691
1
vote
2
answers
1k
views
Linux command line based spam checker?
Does a command line based spam checker exist?
We have created a mailbox at a 3rd party, and unfortunately decided on spam checking 'disabled' in the initial setup.
There is no way to re-enable spam ...
- 1,078
2
votes
1
answer
1k
views
Why Gmail mark as spam emails from my postfix server?
I'm trying to send email from postfix to different providers: Hotmail OK, Yahoo Not tested, Italian Provider OK, GMAIL KO !
I have SPF and rDNS set correctly ... this is the header:
Delivered-To: ...
- 21
2
votes
1
answer
2k
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
X-Spam-...
- 163
1
vote
1
answer
1k
views
How to solve/disable spam sending with my postfix server on linux
I am quite new in setting up e-mail server on linux - I barely set up the whole think to get it working and connected it with my domain and php script which uses PHPMailer 5.2.1. In my setting I am ...
- 23