Linked Questions

111 votes
9 answers
140k views

How to stop people from using my domain to send spam? [duplicate]

I receive Mailer Daemon messages saying certain emails fail. My domain is itaccess.org which is administered by Google apps. Is there any way I can identify who is sending emails from my domain, and ...
Billy Moon's user avatar
  • 1,437
7 votes
6 answers
5k views

Spam prevention tips for Postfix [duplicate]

Without using SpamAssasin, or similar, what are your best tips for preventing spam. Please try and provide config examples :D
Mez's user avatar
  • 457
1 vote
4 answers
3k views

Prevent spamming [duplicate]

How to prevent spamming in Cpanel / Linux server ?
nitins's user avatar
  • 2,599
2 votes
3 answers
8k views

Should I reject email on SPF and/or DKIM failures? [duplicate]

I’m administering a mail server (cPanel/WHM) running Exim. It handles normally a few hundreds incoming emails per day for our customers. I’m not sure if I should reject SPF and/or DKIM failures for ...
esc1729's user avatar
  • 305
0 votes
2 answers
2k views

How reliable is validating email domain by reverse DNS MX record checking [duplicate]

This question is not about how to protect against spam or validate a particular email user. But how reliable is validating emails domain (does it exists at all) by reverse dns. What are the pitfalls ...
Ssss Ppppp's user avatar
0 votes
2 answers
789 views

DKIM, spam probability, signing with key at mail server vs sender domain? [duplicate]

I'm working on an email marketing tool and so far we've been recommending our customers to set up an SPF-record (Sender-ID) and a DKIM-record, we also have our own SPF-record on the mail server and a ...
Andreas's user avatar
  • 111
-1 votes
1 answer
2k views

Suddenly Gmail and Hotmail block our emails [duplicate]

Starting from yesterday, all emails sent from our server are being rejected by Gmail and Hotmail. Everything was working properly until now. Here are the error messages received: Gmail Failed ...
Aram Boyajyan's user avatar
0 votes
4 answers
2k views

Stopping incoming spam with sendmail [duplicate]

I am having an issue due to a "smart" sysadmin that made some choices while I was away for two months: Spam. I manage probably close to 10,000 web/mail sites. He decided to allow all mail to ...
ThatGuy's user avatar
  • 293
-1 votes
1 answer
1k views

sendmail - Server Sending Spam? [duplicate]

for the past day my server is being used to send a spam. I'm using the Amazon Linux Distro (RedHat based). It has sendmail 8.14.4. It is setup to require authentication, SSL etc. Below are some ...
jira's user avatar
  • 109
0 votes
1 answer
416 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 ...
Sniffleh's user avatar
  • 181
0 votes
1 answer
676 views

can someone explain this exim mainlog lines? [duplicate]

i dont understand this lines in exim mainlog , may anybody explain this ? my server is sending spam and i need to stop it. 2015-04-25 07:51:42 1Ylqf0-0000TF-G1 DKIM: d=mandrillapp.com s=mandrill c=...
Ehsan Chavoshi's user avatar
0 votes
1 answer
396 views

Project Honeypot says my mail server has become a spammer [duplicate]

I need help diagnosing this: http://www.projecthoneypot.org/ip_66.18.204.186 It says my server has been sending spam for 4 months! I try to be a responsible mail server admin, I hate spam, I do ...
cecilkorik's user avatar
0 votes
1 answer
311 views

Fixing a server that has been listed an Email Spam [duplicate]

Full Disclosure: Setup of email servers is something fairly new to me, so go easy on me :) Recently users reported that they were not receiving emails from my site. The site runs a vbulletin forum so ...
MrEyes's user avatar
  • 313
-1 votes
1 answer
252 views

How to improve spam protection using postfix? [duplicate]

I try to improve the spam protection of my postfix install for several weeks now, but I still receive spam. What I've done so far: Added SpamAssassin Added SPF record Tuned rejection rules Now I'm ...
Marco Betschart's user avatar
0 votes
1 answer
224 views

Prevent Email Going to Spam [duplicate]

I've set up my own server and I'm really struggling to stop any outgoing email go to spam. I've used allaboutspam and mail-tester.com to test it and they both come back with perfect results. No ...
Pixedo's user avatar
  • 1

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