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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?.

1404 questions
111
votes
9 answers

How to stop people from using my domain to send spam?

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 how they are doing it without me creating an…
Billy Moon
  • 1,437
5
votes
7 answers

Any antispam software beside SpamAssassin?

What other antispam software (server side) is available besides SpamAssassin?
daniels
  • 1,215
3
votes
5 answers

How to notify Gmail, Hotmail, etc. that you are a legitimate website sending lots of notification to users

Although I have already done everything, like adding SFP, DKIM and sending plain text in my emails, I want to notify Gmail, Hotmail, Yahoo, and other "big" popular email providers that I'm legitimate. How and where do you do that?
Luis Lobo Borobia
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3
votes
5 answers

Anti-spam measures for websites

What are anti-spam measure I should consider before launching my user content website? Some things I have considered: Silent JavaScript based CAPTCHA on the register page (I do not have an implementation) Validate emails by forcing a confirmation…
user274
2
votes
2 answers

Spam Analysis Tool

I looked but did not see a question related specifically at spam analysis tools. What I want to do is run our auto generated notification emails through some tools to determine their spam likelihood rating.
KellCOMnet
  • 245
2
votes
0 answers

Spam ranking explodes if a certain URL is mentioned in email body - why?

If any email contains the URL lafargeholcim-foundation.org or if an email is sent using an email address from that domain, certain providers rate those mails as Spam, others not at all. It is enough if the URL appears in the body as plain text or…
Olaf
  • 881
2
votes
1 answer

Simple command line plain text spam or ham classifier

I have a load of database entries that have been saved that are full of spam. I would like to be able to pipe the text output of each into a spamassassin or similar tool to be able to get a score on how likely it is to be spam, but without the whole…
Matt Fletcher
  • 133
2
votes
2 answers

How to deal with forum spammers on Invision Power Board (IPB)?

I am administering a public web forum based on Invision Power Board v2.3.6. Registrations are already filtered thanks to ReCaptcha, but I still have loads of people that seems to register manually to actually post 1 or 2 spams and never look…
Joannes Vermorel
  • 493
2
votes
5 answers

What are the different triggers that email servers use to mark email as spam

I believe that all the major email servers will look at the following before they decide to mark a received email as spam or not. 1. Mx record. 2. SPF record. 3. DKIM signature. 4. SMTP authentication. 5. Email from SSL ports. 6. Email message check…
Karthik Malla
  • 103
1
vote
3 answers

Spam control via email?

My site sends a confirmation email on sign up. There is also a captcha on the signup page. I was thinking... gmail, hotmail and maybe yahoo has captchas on their signup page? In that case should i ignore the captchas on my page since i know spambots…
user274
1
vote
1 answer

What can ISP's do to filter SPAM right on the servers?

My ISP recently changed the configuration of its mail servers so that it's no longer possible to forward them to Gmail to take advantage of its huge SPAM database and have the e-mails be sent back to my ISP. Instead, all e-mails that are deemed SPAM…
OverTheRainbow
  • 277
1
vote
3 answers

Barracuda Spam Appliances (move outside Cisco ASA device)

Do spam appliances have to sit behind a 'firewall appliance' such as an ASA Cisco device(s). Being the fact it is a spam/firewall would it cause problems behind a firewall and need to be public facing due to the fact it would be nat'd to the…
user128098
  • 11
1
vote
1 answer

Tracing of spam sender

I have a mail server using CenOs 5 as Os and postfix as an MTA. My mail server is used for sending mails of clients subscribed to send mail from my server.The problem is that some of my clients are sending spam from my mail server,is there any way…
ACHAL
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1
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2 answers

Information on 50% drop in spam starting Christmas 2010

Has anybody who administers email servers or spam filtering noticed that in last couple of weeks the spam volume has dropped significantly? Is there a chart provided by one of the major spam filtering companies? Edit: Based on our internal stats,…
700 Software
  • 2,273
1
vote
3 answers

Email: X-Authentication-Warning

We're sending out 1000's of mails per day from our site (mainly "click here to verify your subscription") and too many are getting flagged by spam (mainly hotmail). One of the things I noticed in the headers is X-Authentication-Warning:…
stef
  • 151
1
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