All Questions
25
questions
11
votes
1
answer
14k
views
Postfix, how can I reject spam from unknown IP (no DNS)
Despite all efforts to filter spam, I'm still getting spam from unknown even after I've set main.cf to not allow it and to check the DNS etc. Even after adding a pcre: to REJECT /.unknown./ some of ...
- 111
1
vote
1
answer
251
views
smtpd_recipient_restrictions: Some RBLs working, but SBL isn't
I'm trying to set up postfix so that it uses blocklists to block spam.
This is my restriction setting in main.cf:
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,...
- 11
0
votes
2
answers
164
views
Postfix Catchall - Avoid Spam
I've 2 accounts on my CentOS server configured with catchall email accounts. Lately I've been receiving bounced emails with virus that were supposedly sent from my server account, Ex: somestragename@...
- 479
0
votes
2
answers
148
views
Someone sending email through my Postfix/Dove
there might have been answers to this many times. But I can't seem to find one that fits my issues so here we go:
I've ran an email server on my centos machine for over four months without problem, ...
- 16
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
0
votes
0
answers
258
views
Postfix selectively bypassing the spam
I have Centos 7 installed and postfix as MTA on the server. Here is my anti spam postfix additional configuration:
# main.cf ANTI SPAM
disable_vrfy_command = yes
smtpd_delay_reject = yes
...
- 299
4
votes
1
answer
5k
views
how do I filter and reject mails in postfix based on the 'to' address
My CentOS server is configured for outgoing mail only. I need a filter to reject mails targeted at selected destinations. For example, if I test with
> mail -s "test" [email protected]
I want this ...
- 249
0
votes
0
answers
19
views
How to find source of spamming knowing the spam mail header? [duplicate]
Context:
I have a Dedicated Server hosted on Digital Ocean, called as "Droplet" and then, on it i have installed CentOS 6, and my mailing server is using EXIM.
Problem:
I am having spam ...
0
votes
1
answer
952
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
1
answer
833
views
Spammer on CentOS keeps blacklisting my server [closed]
I am the owner of a server and I have got a spam problem on one of the accounts.
The spammer keeps sending lots of mails from fake non-existing addresses from (only) one of my domains. name@...
- 51
0
votes
1
answer
9k
views
How to stop server sending spam out. Centos server with exim [duplicate]
I'm looking at a server that appears to have been compromised via a bug in a wordpress plugin and is now sending spam out.
This post seems to give a very good report of exactly what I'm seeing.
...
- 119
0
votes
1
answer
1k
views
How do I stop SPAM from being sent from my server? [duplicate]
I have a VPS which I rent and it is running Centos 6.
The VPS has ZPanel installed which is used to host some websites and emails.
One of my clients has noticed thousands of 'undeliverable' messages ...
- 311
0
votes
1
answer
1k
views
Server hacked and used for sending spam [duplicate]
Hi I have CentOS server which running mail server. Last 2 days server started to send spam. After doing some research I couldn't solve the issue.
Here is portion of statistics from Exim and the ...
- 109
0
votes
1
answer
331
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 ...
- 149
0
votes
2
answers
6k
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 /etc/...
- 734
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
3
answers
2k
views
Mail spam sending script injected
I apologize if this is already asked a million times.
One of accounts on my server got hacked.
An email spam sending script is injected and sending ton of emails to some random addresses.
I have ...
- 123
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
0
votes
1
answer
132
views
Possible spam emails from our server but not from our domains
I encountered something weird with my mail server. For about 3 days now I am noticing that my mail server sending emails that aren't included in my domains. There are from different IPs different mail ...
- 1
2
votes
4
answers
36k
views
Postfix- open relay. How to configure so it is not?
I have setup Postfix but am having trouble with the setup.
Whenever I used to send emails to the server, it reject my mails saying 'Relaying Denied', so I changed the following in main.cf:
...
- 1,697
0
votes
1
answer
196
views
sendmail injection
I have a server running sendmail. It started sending out tons of spam. I went it, shutdown sendmail cleaned out the queue (removed everything in /var/spool/mqueue).
How-ever, as soon as I restart ...
- 1
2
votes
2
answers
1k
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. ...
- 481
1
vote
1
answer
949
views
postfix before-queue spamfilter with spampd proxy
I've configured postfix with spamassassin. master.conf is as following.
spamfilter unix - n n - - pipe
flags=Rq user=spamfilter argv=/usr/local/bin/spamfilter -f ${sender} -- ${recipient}
smtp ...
- 781
1
vote
2
answers
1k
views
My server is sending spam
I have a dedicated server with CentOS+MySQL installed from godaddy.com. Recently I had some very weird problems: I installed a PHP application which has a thread that queries a MySQL database for ...
Xiaoning Warald
6
votes
4
answers
12k
views
DKIM error: dkim=neutral (bad version) header.i=
Ive been struggling the last couple of hours with setting up DKIM on my Postfix/CentOS 5.3 server.
It finally sends and signs the emails, but apparently Google still does not like it. The errors I'm ...
- 475