Spam is the use of electronic messaging systems (including most broadcast media, digital delivery systems) to send unsolicited bulk messages indiscriminately.

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5answers
249 views

Good ways to prevent spammers from registering [duplicate]

Possible Duplicate: Is there a true alternative to using CAPTCHA images? Since everyone hates captchas what are good alternatives? I'm looking to prevent the automated creation of accounts ...
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2answers
231 views

mod_spamhaus whitelist example to allow a range of ips

How would an example whitelist look like, that would whitelist a range of all IPs from 123.123.0.0 - 123.123.255.255 ? I have the whitelistfile in /etc/spamhaus.wl
3
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2answers
726 views

How does the Yahoo webmail exploit work?

I got an email (referring to me by name) from somebody I knew a while ago and the email itself was just two/three lines containing a bit-ly link. Although it seemed like it actually could be ...
1
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1answer
74 views

Is a company responsible for a spam which mentions it?

Let's say I receive a spam which mentions a fictive company printmycatphotos.com. If I follow the link, upload files, and finalize the transaction, clearly printmycatphotos.com has made some profit. ...
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11answers
4k views

Is there a true alternative to using CAPTCHA images?

Security is about balancing costs and risks, nothing is impossible to beat, specially not typical CAPTCHA implementations, but they do add something no other system seems to offer. I've been reading ...
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3answers
1k views

Emails wrongly flagged as spam by filter, claiming suspicious URLs

My wife runs a small website (in Japanese) selling vintage products online. She's sending out emails to customers with details about their order, together with images of the products and links to the ...
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2answers
154 views

YouTube channel gone crazy!

OK, I use youtube just for listening music and watching videos. I don't upload, and I don't comment. Sometimes I do like some videos/comments. But today I accessed my channel and I saw like 20 ...
6
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5answers
575 views

How do spammers verify the validity of a huge amount of email addresses?

I noticed that there is an email address validation method, that is to telnet to a email MX server and send rcpt command to the server. But for this method, the MX server may abort connection after ...
6
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2answers
1k views

Will reporting phishing emails cause problems for the victim?

On GMail, I've received a phishing email from someone I know, and the email has been sent to other people the victim knows. One of the emails is claiming to be from their GMail address, while the ...
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4answers
4k views

Spammers bypassing the reCaptcha

I'm using recaptcha on a very simple forum registration page. The script first of all checks if the recaptcha code is valid, then it process. As soon i did put the website live, it got lots of spam ...
2
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3answers
207 views

Odd spam in a forum

In the forum http://forums.finehomebuilding.com/breaktime/ (same forum that was one of the subjects of this thread) we're seeing a lot of "spam" of a curious sort. Obvious non-native-English speakers ...
4
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1answer
510 views

Mail server (sendmail) sends spam to innocent people

I asked this same question in serverfault but realized that wasn't the right place, I apologize. Background Server OS: Ubuntu 10.04 Mailing Application: Sendmail Recently I asked about backscatter ...
2
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1answer
191 views

Who are these crazy referrers?

In my web pages' IP logs, I have recently begun seeing some very strange referrers, like this: http://haddies.4t.com/tramadol-hcl/tramadol-hcl-200mg.html ...
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2answers
141 views

Are these email captchas legitimate?

The last week, I've been getting this kind of emails to addresses that I don't use: Dear Sir, Madam, For security reasons and as part of our ongoing fight against spam, it is our policy not ...
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2answers
219 views

Is it possible to MITM between Google voice SMS/TXT Messaging

I have 2 spammers who won't stop spamming me via SMS once I post stuff online. I would like to determine their location based on language, so if I were to somehow become a man in the middle and have ...
5
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1answer
2k views

Facebook page receiving improbable amount of likes from unknown users

A bit of an odd problem, but I'm not totally sure where to post this. I am an administrator for a facebook page that suddenly began receiving hundreds of likes in the past few days. This trend began ...
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3answers
240 views

How to find & remove twitter spambot?

Sometimes i can see that i've "retweeted" some tweets , that i actually didn't. And all of them spam to some gaming & pharma websites. I've got windows 7 64bit, norton internet security , using ...
4
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1answer
413 views

How to catch a SMS spammer who is using google voice to spam me

How do I catch a SMS spammer who is using google voice to spam me? I have the google voice number and 2 of their burner emails with gmail. How do I gather enough information to inform the ...
1
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0answers
194 views

Honeypot for catching a spammer [closed]

I've been receiving more and more emails and now even TXT messages originating from google voice for inquiries of items that I've listed for sale on craigslist. What I would like to accomplish: I ...
6
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4answers
4k views

Can most mail from *.ru be considered spam?

Is it safe to assume that most, if not all, emails from a *.ru domain may be considered spam? From a log of 30000 emails from *.ru, its all been spam (over two months).
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1answer
392 views

What user was this spammer trying to authenticate as?

I have a custom application that monitors and logs a user's SMTP session, and came across this spammer trying to use my MTA as a relay. Is it possible to determine what username they are trying to ...
3
votes
3answers
2k views

Delivery Failure Notification spam protection?

My domain (example.com) has recently been targeted by spammers who are sending email (somewhere) but forging the sender as random-name@example.com. I have been getting flooded by delivery failure ...
2
votes
1answer
293 views

Is there any reason to not use DKIM, SPF, and SenderID because it affects plausible deniability?

Is there any basis in not deploying anti-spam (or deliverability) technologies like DKIM, SPF, and SenderID because it affects plausible deniability? Some definitions to get everyone on the same ...
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2answers
16k views

How was my Yahoo email account used to send spams

My yahoo email account was sending spams at about 6:42pm EDT (the spams show 3:42pm PDT) yesterday. I realized it by receiving several "Failure Notice" emails for Yahoo was unable to deliver the spam ...
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2answers
375 views

Is spam more likely to be sent to info@example.com? Would I be better off using a different address?

I think that when bots gather domain names or process a list of domain names, they create email addresses like info@example.com or support@example.com. Does selecting something different help to ...
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1answer
133 views

Reliability of DNSBLs for Stopping Forum Spam

I know that certain DNS blacklists are considered more reliable than others, in that they don't have as many false positives. I run a forum that is known to be spammed, and I've installed a mod to ...
6
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3answers
1k views

Hashcash, is this really used?

I just heard about this term, is it really used? The concept does not seem new, is it used and/or implemented in current technologies?
5
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5answers
3k views

How did the spam email sender get my name?

Some time ago I bought something online from a reputable website. I paid through my credit card and everything worked fine. The thing which is important to note is that the name used on the credit ...
9
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5answers
6k views

How and why do people spam my website form?

In have a web form on my website, and someone keeps sending annoying spam through it. I know Captcha can block this, but why do people spam my site - what's their benefit? How do they access my web ...
28
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3answers
1k views

What is the point of spam like this?

I fairly often happen across forums spammed with messages such as: Arugula (Eruca sativa) is an quarterly green, pretended or roquette. It's been Traditional times, overclever 20 flat has be ...
5
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1answer
112 views

How long can I store personal information on unconfirmed subscriptions?

I have a monthly newsletter. In my subscribe form I use a double opt-in method: The visitor subscribes. I send him a confirmation email. If I receive a reply, I add him/her to my system. In the ...
2
votes
4answers
345 views

How to prevent private data being disclosed to unwanted audience over internet?

Everyday, in order to subscribe to certain services on the Internet we are almost forced to disclose private data even though those services don't necessarily require it. For example, I need to ...
2
votes
2answers
243 views

Is it unsafe to allow apps other than Outlook to send email via the Exchange server?

My application is a .NET Windows Forms client, one of whose functions is to allow the user to send personalised mailshot emails to opted-in recipients stored in the database. The emails are sent ...
0
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1answer
718 views

Email not received when sent by our app, received when sent by outlook [closed]

We have an application that sends mail in bulk, via a mail provider (Mailjet). Our clients are professional organizations, and they send important mails about meetings and stuff like that, to about 10 ...
2
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2answers
458 views

Killing IP connections who “spam” with requests

How can I go about killing IP connections that seem to be sending a lot of requests to the same url? Let's say I have someone who requests the same url for more than 10 times in 5 seconds, I want to ...
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2answers
733 views

How to react on a message about a pending account ban on Facebook? [closed]

Are you getting this message on chat? LAST WARNING : Your account is reported to have violated the policies that are considered annoying or insulting Facebook users. Until we system will disable ...
8
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1answer
404 views

Cheap to validate yet expensive to compute hashing algorithm

I am looking for a hashing algorithm somewhat like bcrypt, except that I would like validation to be extremely cheap. As an anti-spam measure I would like to require my clients spend say, half a ...
4
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3answers
204 views

There's a lot of spam, and hacked sites are often used to distribute it [duplicate]

Possible Duplicate: What are common/official methods of reporting spam/phishing/nasty-grams to organizations? My production application receives a lot of emails and I can easily detect spam ...
6
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3answers
287 views

What are common/official methods of reporting spam/phishing/nasty-grams to organizations?

A user of mine just received a phishing email claiming to be the IRS. What methods of reporting are available, and what should be included?
0
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1answer
304 views

Wordpress online pharmacy hack? [duplicate]

Possible Duplicate: Protecting WordPress installations anybody knows how to protect your WordPress website from online pharmacy spam, even after deleting all spam files and deleting spam ...
6
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2answers
281 views

Statistics on purposes of viruses/malware

Are there any resources that analyze the purpose or goal or the major viruses/malware out in the wild today? For example, what percentage are used to construct botnets (for DDoS or something else)? ...
5
votes
6answers
334 views

Spam fighting idea

I have this crazy idea that spam e-mail would not be worth the time of the senders. This is how it's going to work. Someone sets up a reputation-based site, much like stackexchange sites, where ...
7
votes
4answers
334 views

Next steps after webmail account was compromised

John Doe told me the following story: I got a mail from a good friend. It just contained a single link. That seemed odd but I didn't think a lot about it. After clicking on the link, the web site ...
2
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1answer
375 views

What is this spam used for?

Recently my secondary e-mail address was exposed by an incident, and soon I received this spam. What is this spam used for?
28
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2answers
6k views

What malicious things can happen when clicking on links in email?

I've received a spam from one of my friends (well I'm sure he didn't send it). so there's this link, and i'd thought what exactly would be the implications of clicking the link (i've not clicked it ...
3
votes
2answers
260 views

Legal process for suing joejobber?

I'm currently being joejobbed, and want to sue the joejobber. Details: I have real damages: the joejob causes me to receive fake bounces, which: stop/delay my receipt of legitimate mail, since ...
12
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4answers
550 views

what to do after suspected intrusion on hobby webserver

I maintain a server to host my files and a number of websites for hobbies and friends. I just noticed that the site summary being returned in google for one of my domains were all porn related ...
9
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2answers
1k views

Caller ID Spoof and Text Spams – How do they work?

(Posted here after a comment/suggestion from: http://superuser.com/questions/254340/caller-id-spoof-and-text-spams-how-do-they-work. Apologies if deemed not appropraite) A lot of people will have at ...
6
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1answer
2k views

How to create your own RBL DNS Blacklist to prevent spam

I am getting sick of reporting the same old chinese emails to Spamcop now and would like to make my own small RBL list that I can easily add blocks of IP's to. I have a spare PC and static IP address ...
6
votes
2answers
1k views

spam with my own domain

At my work we have a very tricky issue with spam. We use postfix, and recently began to receive several spams mail with our own domain. This is obviously very prejudicial for us, because many ...