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

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0
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0answers
38 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 ...
7
votes
4answers
13k views

How to report spam to blacklists

Is there a central place to report spam to various blacklists ? I regularly report to spamcop, but I do not see the addresses I reported as listed. (I guess nobody else bothers with my regular ...
0
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2answers
693 views

Prevent server beeing flooded with requests

I'm hosting a Wordpress-blog on an Apache server (shared hosting). For some reasons I've been receiving like 100 requests per second to xmlrpc.php for a few days. The access.log looks like this: ... ...
3
votes
2answers
5k 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. gmail.com/...
1
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0answers
21 views

How I can look from that script runs sendmail?

my problem is that some script in php or some other script or program is sending spam. I am not able to trace where this program runs. do the following: ps aux | grep sendmail nginx 28286 0.0 ...
0
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0answers
9 views

What's a reproductable way to set up a Linux server for sending e-mails but no spam? [duplicate]

I've created a software that has to be installed onto a Linux server and from time to time it has to send a notification email. So, for people who want to use my software, I've created a bash script ...
0
votes
1answer
71 views

Exchange server 2016 Content Filtering

I have setup an exchange server on premise with at SMTP Relay on our VPS. It works very well, unfortunately I’m a little confused as to where I setup the various permissions for SPAM. All my incoming ...
0
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1answer
65 views

Using DKIM in my server for multiple domains (websites)

As I couldn't find this exact tutorial in Stack, I share my findings with al of you. I always get things solved thanks to this comunity. Thanks! Original question: I've read the tutorial posted by ...
1
vote
1answer
63 views

Spam filtering: MX record and reverse DNS (PTR)

If I perform an MX query on my domain (domain.com) I receive this answer: Pref Hostname IP Address 5 mail.domain.com 12.34.20.145 If I perform a reverse DNS (PTR) query on 12.34.20....
1
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0answers
79 views

PHP Script sending spams and mail.add_x_header not working

I've got my server hacked lately by some Php64 malware. Since then, I have found a lot of PHP files in my /var/www sub-folders. I am trying to delete each of these or clearing the files when some ...
0
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2answers
49 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, ...
-1
votes
1answer
27 views

Why are some spam emails addressed to hexadecimal addresses?

I've run Postfix to host my domain's email for years now, and generally I've reduced spam to an acceptable level (including use of greylisting, SpamAssassin, and DNSBL). One thing I've never figured ...
0
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0answers
7 views

Using mail.domain1.com for domain2.com mail server? [duplicate]

I have a Linux CentOS machine, and 2 domains hosted on it: domain1.com domain2.com Is it safe to use one mail server for both: mail.domain1.com? If I use mail.domain2.com, I have problem ...
0
votes
0answers
19 views

Google puts my mails to spam [duplicate]

I have a mail server with proper (I think) configuration, but Google puts my mails to the spam folder. I see the following error in the source: Received-SPF: fail (google.com: domain of info@exmaple....
0
votes
0answers
15 views

Postfix mail always in spam [duplicate]

I've installed and configured postfix trying to find the best way on the web. This is postfix main.cf: smtpd_tls_security_level = may smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout =...
0
votes
0answers
29 views

Can I use Spamassassin to classify text-only content?

I wish to know if I can use spamassassin classify text-only content? Right now I'm using the following command: spamassassin hello.txt But I'm getting the following warnings: 1.2 ...
6
votes
2answers
14k views

Postfix check outgoing mail for spam

How can I force postfix to check (and log/flag/etc) all outgoing mail for spam? Just want to make sure I'm doing my part on my servers. EDIT: Postfix config, as requested. main.cf # See /usr/share/...
1
vote
2answers
45 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 ...
0
votes
1answer
120 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. admin@site.com is sending to careers@site.com and nonexistentemail@site.com is sending ...
1
vote
2answers
1k views

why my mails from zimbra server to yahoo goes in to spam folder

I just configured zimbra mail server but mail from my zimbra to yahoo, hotmail etc going into there spam folder any suggestion??? bellow is header part from yahoo of that mail X-DSPAM-Result: ...
1
vote
0answers
38 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 "...
0
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0answers
103 views

SpamAssassin: avoid FREEMAIL_REPLYTO on Contact Form

Suppose: someone fills out my contact form on www.example.com/contact/. My server-side script sends this information to a sales person at the organization. To make SPF work, I set the "From" as ...
0
votes
1answer
50 views

How do I tweak spamassassin scores on Ubuntu Server?

I'm wondering what's the right way to tweak scores for Spamassassin's builtin rules. I know how to edit /var/lib/spamassassin/3.004000/updates_spamassassin_org/ but that doesn't feel right - my ...
-1
votes
1answer
47 views

Why does Google junk mails from my server? [duplicate]

I have a send-only mail server setup on an Ubuntu VPS. The mail server is only used to send out registration e-mails from a web application. I have the following configured: DomainKeys Identified ...
3
votes
2answers
103 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
vote
1answer
652 views

Adding mail header if postfix DNS based RBL (realtime black hole) check fails

I have setup a receiving Postfix mail server. Here i have custom code written that parses the whole mail received by postfix and use the headers, body and attachments separately for different uses. I ...
3
votes
2answers
2k views

What does the email header “X-CAA-SPAM” refer to?

I've got an application that sends out notification emails to users of the application (this is not spam; the information in these emails is solicited and useful, and is also a feature turned off by ...
4
votes
3answers
480 views

With valid SPF my mail header becomes huge -> high spamassasin score

I have a dedicated server with a survey system running on a subdomain. The parent domain is hosted on another server. I send email via google apps. Reverse DNS is correct. Without SPF og DKIM, the ...
1
vote
1answer
36 views

Postfix Hostname domainbased

I would like to excuse in advance, if my question has already been answered before but im going crazy since a week now... I'm not new to this but after a while in another job, my "skills" are totally ...
2
votes
2answers
2k views

All headers pass, hotmail still marks as spam [duplicate]

Possible Duplicate: Why Does hotmail still reject my emails? So I've been working a long time on fixing the Hotmail issue, but nothing seems to work: Created my SPF records with the ...
0
votes
1answer
60 views

SPF in hotmail are not used [duplicate]

I have a problem with Hotmail provider, all mail sent from my server goes to SPAM folder. I Have added a correct SPF to my domain example.com but into the headers is not used (spf=none) and the token ...
0
votes
2answers
310 views

Postfix Header Filter

I have set up a header filter in postfix to discard messages from Russia and Romania because of the volume of spam coming from those and we do not currently do business in those countries. My regex ...
1
vote
1answer
213 views

Spam avoidance issue

I'm working on a project right now that sends email as confirmation of purchase. Some emails are still being received as spam. I have signed the domain up for google apps for business & am using ...
0
votes
1answer
722 views

postfix header_checks - regex spanning multiple lines

I would like to create a spam filter that spans multiple lines in headers. This is my /etc/postfix/header_checks file: /^From:.*name[0-9]+@.+[\r\n]+To:.*name@domain\.com/ REJECT It's a valid regex,...
70
votes
10answers
81k views

Dealing with HTTP w00tw00t attacks

I have a server with apache and I recently installed mod_security2 because I get attacked a lot by this: My apache version is apache v2.2.3 and I use mod_security2.c This were the entries from the ...
0
votes
1answer
50 views

Reject emails from specific address on exim

i have a spammer that is driving me crazy. What i want to do is reject his emails altogether so he receives an instant message saying "message rejected" or similar. Can exim do this? How? Note: This ...
13
votes
10answers
4k views

Using fake MX records to combat spam

I have a client that is getting heavily spammed.. It's the 15th of the month and POP3 bandwidth is almost 100 GB. There are only 7 e-mail accounts on this domain. I installed SpamAssassin set it to 5 ...
1
vote
2answers
215 views

Prevent MAILER-DAEMON NDRs from deferring in Barracuda

Mail Server: Zimbra 6.0.9 Spam-Firewall: Barracuda Spam Firewall 300 (Firmware v6.1.5.006) All spam firewalls only work so well, and unfortunately some spam will come through. Incoming spam will ...
9
votes
10answers
13k views

Relatively easy way to block all traffic from a specific country?

I have a web app that has no users in the Philippines, but is constantly bombarded by spammers, carders testing cards, and other undesirable activity from there. I can see in the logs that they have ...
2
votes
1answer
32 views

letting anonymous users use a form to send emails as if it is from their own mailboxes without getting flagged as spam

I am working on a project for an environmental NGO. They want to let users use a form on their website, provide their name, their email address and select certain emails from a list to send complaints ...
7
votes
3answers
225 views

Is SRS rewriting absolutely necessary for a forwarding mailserver?

I am operating a Postfix email server for my domain, say mydomain.com. It mostly acts as a forwarding email server: users receive an email address @mydomain.com, but usually elect to have their ...
0
votes
1answer
43 views

trying to locate process on server which is sending spam email [duplicate]

I have a CentOS server running Exim, with a standard LAMP stack installed. The problem is that there is a process that is sending out unsolicited emails, AND I do not know how to locate the process. ...
2
votes
5answers
6k views

How to prevent mail from our website going into spam mail of users?

I work for an educational services company based in India. We've around one million students enrolled as users. We're frequently facing the problem of our bulk mailers regarding upcoming exams, new ...
0
votes
0answers
16 views

Mail get's registered as spam, everything set up correctly [duplicate]

I'm having serious troubles with getting my email to be not detected as spam. I've tried EVERYTHING. I've tried multiple forums and even there they were out of ideas. So, I have tested almost every ...
28
votes
7answers
4k views

Why is it a bad idea to use a customer email as the from address

I've got an application that emails users once they have filled in a form. It uses a no-reply@customerdomain.com as a from address. The customer wants it to use the email from the form as the from ...
0
votes
1answer
104 views

How to get rid of spam mails with return-path and from non-existent@mydomain.tld

Over a few days I'm getting several spam mails to my junkmail folder. The return-path and from addresses are always non-existent mailaddresses of my own tld (for example non-existent@mydomain.tld). I'...
0
votes
0answers
44 views

mail server should anyone be able to send internal mails from external IP without authentication?

Sorry for the long title. My parent organisation that owns the company I work for accepts emails to be sent from test@org.com to test@org.com when connecting via port 25 telnet externally. I'm ...
0
votes
0answers
62 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 ...
0
votes
2answers
116 views

signed-by in mail header is not added as I have installed and configured my domain

I have checked in http://dkimcore.org/c/keycheck that my site has a valid TXT record for DKIM. My domain is myDomain.com and my selector is mail. I used -t and says to servers to ignore errors and ...
0
votes
0answers
9 views

Five Questions about Specific Examples of Sender Policy Frameworks (SPF) [duplicate]

I have spent some time learning about SPF and have five questions based on specific SPF policies. I obtained the SPF data via http://www.kitterman.com/spf/validate.html In advance, many thanks for ...