Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [spam]

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

Spam can refer to:

  • Junk e-mail
  • Unwanted posts on a website
  • Unwanted comments on a post on a website
  • A large number of posts designed to crash a system rather than provide useful content

For our canonical Q&A about how to prevent email you send from being flagged as spam, see How to send emails and avoid them being classified as spam?.

1384 questions
25
votes
4 answers

Fixing My MTA's Poor Reputation

I have a web site that needs to send email to customers to deliver files that they have purchased. Reliable email delivery is vital to this business. Unfortunately, most of the emails sent by my server are not delivered due to my MTA's "poor…
Alex Reisner
  • 830
  • 2
  • 9
  • 10
22
votes
5 answers

Does DKIM alone not solve the spam issue? Why do I need SPF?

FINAL EDIT : I was completely wrong about DKIM it seems, the signing domain does not have to be the same as the sender domain, thus the whole premise for my question is flawed. A lot of thanks to Paul for pointing out my mistake! Original Question…
cornergraf
  • 481
  • 1
  • 4
  • 8
21
votes
4 answers

What are the best methods for catching snowshoe spam?

I'm using Smartermail for my small mailserver. We've been having a problem lately of getting waves of snowshoe spam that follow the same pattern. They come in batches of 3 or 4 at a time. The bodies are almost identical save for the domain name…
pooter03
  • 436
  • 3
  • 11
21
votes
9 answers

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 IPs in the Philippines and are initially finding…
Eli
  • 741
  • 2
  • 8
  • 16
20
votes
12 answers

Which anti spam DNS blacklists should used?

i want to protect my mailserver with dns blacklists for fighting the spam. there a so many blacklists out there. currently i use: ix.dnsbl.manitu.net cbl.abuseat.org bl.spamcop.net safe.dnsbl.sorbs.net dnsbl.njabl.org should i add/remove some…
coding Bott
  • 568
  • 1
  • 4
  • 13
19
votes
9 answers

Gmail and Live are making all messages from my server as spam

I'm getting very weird results here. When my server sends an email to my @hotmail or @gmail account, it's marked as spam. When I send email through my server from Outlook to @hotmail, it doesn't get marked as spam, but it still gets marked as spam…
Ryan Kearney
  • 293
  • 1
  • 6
17
votes
4 answers

Is my new gTLD causing it to get filtered as spam?

I have a domain called "*******.international". I decided to go with the new gTLD because it fits the name of the company pretty well. I have an automated emailer setup to send emails to our clients' emails and I've noticed that a few companies are…
Kevin Evans
  • 273
  • 3
  • 8
17
votes
2 answers

IIS7 ban IP range

Possible Duplicate: How does IPv4 Subnetting Work? I have a list of IP ranges I would like to ban, an example being: 119.30.47.xx Where xx is anything. I've added the domain and IP restrictions into IIS. When I click add deny entry, I see: For…
Tom Gullen
  • 375
  • 4
  • 7
  • 24
16
votes
6 answers

Spam emails regarding Domain Abuse Notices

I have received domain abuse notice email from chloe-gray@icann-monitor.org. The mail asks to download a Word Document which I believe contains a virus. Dear Domain Owner, Our system has detected that your domain: example.com is being used for…
AAgg
  • 321
  • 1
  • 4
  • 11
16
votes
1 answer

What is preferable, "no-reply@" or "noreply@"?

Having a service that sends out notifications to users, I'm currently thinking about changing the sender email address from "info@" to something more meaningful. Since a reply never makes sense, I'm thinking about using one of those "no reply" email…
Uwe Keim
  • 2,370
  • 4
  • 29
  • 46
15
votes
3 answers

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 address forward to an external inbox (Gmail, Yahoo,…
tlng05
  • 245
  • 2
  • 10
15
votes
5 answers

How to minimise SpamAssassin (spamd) memory use

I'm using SpamAssassin on Debian (the default configuration with Pyzor, AWL and Bayes disabled, and sa-compile enabled), and each of the spamd child processes consume around 100 to 150MB of memory (around 50MB of real memory) on the 32 bit servers,…
Tony Meyer
  • 889
  • 1
  • 13
  • 25
14
votes
11 answers

Good & free Exchange spam filter

Do you know a good (and free, if possible) Microsoft Exchange 2003 spam filter?
Olivier Payen
  • 243
  • 1
  • 4
  • 6
14
votes
1 answer

How to resolve problems with spf / softfail?

I'm having problems with Google rejecting mail because of SPF problems. I thought I had this fixed, but evidently not... The mail is being sent from a Drupal site running mimemail. A message that shows the problem looks like: Delivered-To:…
Jim Miller
  • 713
  • 2
  • 11
  • 23
14
votes
10 answers

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 and setup 10-20 filters reject most of the junk.…
Mikey1980
  • 711
  • 1
  • 8
  • 12
1
2
3
…
92 93