All Questions
37
questions
0
votes
0
answers
37
views
Configure fail2ban to parse multiple log lines, e.g. Postfix mail rejects
I want to to block local authenticated mail users who generate spam, i.e. disable their SMTP access for a while as one of several countermeasures against hijacked accounts and malware.
To accomplish ...
- 149
1
vote
0
answers
23
views
Postfix configuration to block spammer domain isn't working
I have an Ubuntu 22.04 cloud VM with Postfix 3.6.4-1ubuntu1.3 installed that I largely use for receiving e-mails sent to addresses at my personal domain that I provide when signing up for less-...
- 117
0
votes
1
answer
56
views
Increase in spams through website contact forms after change of server
I recently moved my website from Hostgator to an Amazon Web Services' EC2 instance. From a few days later people/bot started posting spam messages in the forms that are on the website.
Is there ...
1
vote
2
answers
105
views
Apache "ghost" requests?
I lack the ability to formulate my problem, otherwise I'd probably find the solution.
I notice there are quite a number of pointless requests in my access log
:~/$ cat /var/log/apache2/access.log | ...
- 379
0
votes
0
answers
43
views
How do I ensure that only my e-mail server is sending e-mail through my network?
This is a follow-up to Our IP was listed by Spamhaus - how can we prevent this from happening again? - unfortunately, it is happening yet again.
I was thinking that people could have malware on their ...
- 171
-1
votes
1
answer
434
views
Ubuntu 16.04 Postfix works, but email goes to SPAM
Hello i follow this guide to install Postfix
https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-18-04
and i added SPF, dmarc ...
- 3
1
vote
2
answers
455
views
Our IP was listed by Spamhaus - how can we prevent this from happening again?
I'm the technical assistant at a small-town public library where we run our own e-mail. If it matters, it's Postfix on an Ubuntu 18.04 box. Gateway / firewall is a 16.04 box with port forwarding set ...
- 171
0
votes
1
answer
1k
views
How to cut-off spam (postfix+amavis-new)
I'm using postfix+dovecot+amavis-new+clamav+spamassassin+postgrey on my Ubuntu based VPS.
Since some days i'm receiving a lot of spam, with a low level of spam score in headers.
Common for all spam ...
- 1
1
vote
2
answers
717
views
Logwatch Emails marked as spam; how to stop reverse DNS on bot hosts?
Is there a way to alter the Logwatch settings such that it stops performing reverse dns name resolution on all the hosts which tried to probe the server or were blocked?
These URLs are causing the ...
- 147
0
votes
0
answers
606
views
Mail command in AWS EC2 ubuntu instance is sending emails to spam folder
Recently, i have upgraded my EC2 ubuntu instance from t2.micro to t2.medium in AWS to fight space related issues. Though the upgrade went well, mail command which was working fine in t2.micro started ...
- 101
1
vote
2
answers
5k
views
All outgoing mail is marked as spam by gmail [duplicate]
All my emails sent from my SMTP server (created with VespaCP) is being marked as spam by gmail. DNS and DKIM is setup correctly. By using isnotspam.com, I have figured out that the reason is ...
- 121
-4
votes
1
answer
95
views
Restrict users to send emails only from a particular IP address to reduce SPAM [duplicate]
How to restrict people to send emails from my email domain to reduce SPAM. We are using postfix in ubuntu.
Is there any parameter which I can configure in main.cf to achieve this?
Any help will be ...
- 101
1
vote
1
answer
63
views
Forcibly disconnect spammers
I have Postfix, Dovecot and Amavis on my Ubuntu server. Recently, I get every 4 minutes a connection from IP 155.133.82.96, which appears to be Windows XP and maybe has a virus. Anyway, I found the ...
user243975
3
votes
2
answers
1k
views
Understanding exim4 outgoing message logs. Am I a spammer?
Today I got many spammy emails into my mailbox, I looked in exim4 logs and I found some suspected activities.
I would like to understand the serverity of this attack, if I got spammy mail I can ...
- 1,344
4
votes
2
answers
5k
views
Firewall rule to only allow Postfix to send email through SMTP on port 25
As suggested in How do you detect a spambot on your network? how can I setup firewall rule to allow only Postifx to send emails using SMTP on port 25 and disallow all other applications to send on ...
- 283
3
votes
4
answers
2k
views
False IP blacklisting on CBL and Spamhaus ZEN
I've gone thru this: Spamhaus XBL keeps adding my IP
I'm managing the server 23.239.30.81 on Ubuntu using Postfix.
Since last 6 months or so I started forwarding all my:
Cron Daemon logs
Postfix ...
- 283
1
vote
1
answer
206
views
How To Only Restrict PHP5/Apache to Send Mail Only To Local Users
I need some help. I am running lastest stable Ubuntu which hosts Apache/PHP5 and also delivers email. I host some WordPress sites for other users and have been waging a war for months now combatting ...
- 339
-3
votes
1
answer
927
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 ...
- 215
0
votes
1
answer
92
views
No-Listing policy with postfix (ubuntu)
I'm running an experiment on a virtual machine. In the virtual machine I've installed ubuntu and Postfix as a mail server. I followed the guide: https://help.ubuntu.com/community/Postfix , only the "...
0
votes
2
answers
604
views
How to check whether my server turned into a spamming machine?
I am suspecting something is sending a plenty of mails from my server without my knowledge. I'd like to check whether my machine turned into a spamming server. What is the easiest way to do this?
...
- 411
0
votes
1
answer
129
views
Spam e-mail tracing
I have this issue where I receive on my server admin e-mail failure notices to a lot of e-mails that I or my hosted domains did not send.
The machine is an Ubuntu with Plesk 11. For e-mail I use ...
- 113
-1
votes
2
answers
3k
views
Postfix is Sending Spam [duplicate]
I have an Ubuntu 12.04 server, hosted on AWS, that powers a dozen WordPress installations using Nginx and php5-fpm.
The problem just began one day. My server was down. Panic! Whenever I turned it on ...
- 127
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
3
votes
2
answers
2k
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 ...
- 131
0
votes
2
answers
585
views
Server sending out SPAM [duplicate]
Update:
It does seem as the server is not compromised, but is used as relay server. Now I'm trying to figure out how to disable this.
I have server running Ubuntu 12.04 LTS with several domains ...
- 11
1
vote
1
answer
607
views
Dovecot Forward Spam
I was wondering if anyone had any knowledge on how this idea can be done. It's not a requirement but more of an idea I came up with that I don't know how to word my google searches to find out if it's ...
- 189
0
votes
2
answers
347
views
DKIM signed mails go to spam folder and do not show key icon
I have installed DKIM for my sendmail and I have also configured it. But I still see that my emails are being considered as spam by gmail. Also, I do not see the "key" in the emails (even if I unspam ...
- 423
8
votes
2
answers
14k
views
Optimal parameters set for Postfix "smtpd_recipient_restrictions"
we've inherited the DNS from another ISP and now our mail server is bombed by about 1000 emails per minute, 99.99% of these emails are just spam. We're trying to optimize the filtering/rejecting the ...
- 193
0
votes
2
answers
297
views
How to avoid outgoing emails to be flagged as spam by google? [duplicate]
Possible Duplicate:
Best Practices for preventing you from looking like a spammer
I use Exim4 as MTA on Ubuntu server. The problem is that all outgoing emails are being flagged as spam by google ...
- 3,177
0
votes
1
answer
1k
views
Sending mail through local MTA while domain MX records point to Google Apps
My domain's email is managed by Google Apps, so that domain users get Gmail and Calendar, etc. But I also want to be able to send applicative notifications to users outside the domain via email (e.g. "...
- 297
0
votes
2
answers
441
views
Debugging the source of rogue emails coming from my domain?
Somehow, rogue spam emails are being sent through my domain from [email protected]. I'm using google apps to manage email, and I see no test user account, so I'm not sure what could possibly be ...
- 1,079
0
votes
3
answers
1k
views
My system is sending spam, where to start fixing it?
One of my smaller webservers appears to be sending out spam. It is a Ubuntu 8.04 system with Plesk as a configutation interface and qmail as the mailserver.
How to I go about identifying the spam-...
- 373
1
vote
3
answers
408
views
Blocking a distributed, consistent spam attack? Could it be something more serious?
I will do my best to try and explain this as it's strange and confusing to me. I posted a little while ago about a sustained spike in mysql queries on a VPS I had recently setup. It turned out to be a ...
- 252
6
votes
1
answer
4k
views
How do I do an exact whois search?
When I execute the following whois command on my Ubuntu server, I get all sorts of other domains which contain google.com in the name, but clearly aren't owned by google. As this appears to be some ...
- 1,074
5
votes
7
answers
16k
views
How to check my linux server isn't spamming
I'm worried about dodgy php scripts or other malicious software on my linux server sending out spam. Or maybe I left an open relay
What are the ways to check I'm not sending any spam out?
- 615
0
votes
1
answer
964
views
plesk 9 spamassassin server wide blacklist via cron?
we're running ubuntu 8.04 LTS and plesk 9.2
our simple task is to set up a periodic black list for spamassassin, e.g. using this script ..
#!/bin/sh
#! Script by AJR to update local spamassassin ...
Kqk
1
vote
1
answer
321
views
Testing email system, spam injection tool recommendations?
is there any free spam injection tools available on ubuntu for testing the email system ?
i would like to get free Spam inject tools for testing mail systems which i am part of development
Edit 2 : ...
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