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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37
votes
2answers
16k 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 ...
67
votes
4answers
7k views

Is using 'dot' and 'at' in email addresses in public text still useful?

When entering your email address publicly, a practice is to replace . with text dot and @ with text at. I assume that the reasoning is that this way automatic email-collector robots won't match your ...
54
votes
4answers
3k views

What is the point of gibberish spam

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 ...
26
votes
6answers
15k views

How do I safely inspect a suspicious email attachment?

I received a pretty blatantly spammy email to my Gmail account. I'm not really sure how it made it through the spam filters, since it has all of the telltale signs. The FROM field is spoofed as ...
9
votes
3answers
468 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?
15
votes
4answers
689 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 ...
71
votes
8answers
8k views

Unsubscribe safely

I have heard that is better to never click to any link in an email. Is it a bad idea to click to a unsubscribe link? What is the best way to unsubscribe to undesired mails?
22
votes
3answers
3k views

How does Bayesian poisoning work?

This answer mentions Bayesian poisoning in passing and I've read the wikipedia page but don't feel I've fully grasped it. The first case, where a spammer sends a spam with a payload (link, malicious ...
6
votes
2answers
2k 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 ...
5
votes
4answers
6k views

What does this malicious PHP script do? [closed]

Somebody hacked my site and uploaded this script (template46.php) to my webroot and its content is: <?php $vIIJ30Y = Array('1'=>'F', '0'=>'j', '3'=>'s', '2'=>'l', '5'=>'M', ...
173
votes
3answers
13k views

What is the purpose of “gibberish” comments posted to my blog?

Fairly frequently, the contact form on my blog gets comments that look similar to this (each field represents a text box users can enter into the HTML form on the blog): Name: 'ceguvzori' Email: ...
21
votes
4answers
3k views

Would 'spam' mail really avoid eavesdropping?

spammimic.com offers a service that 'encrypts' your mail as 'spam', the rationale being that all mail services automatically filter out spam, and so if you're wanting to communicate with someone ...
11
votes
12answers
7k 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 ...
27
votes
10answers
6k views

How to explain to a customer that spamfilters don't catch everything

I used to work in a small office which provided basic desktop support for users. One day I had to answer a call from a very angry customer and he asked for my boss. He wanted to know how could one ...
4
votes
1answer
68 views

Databases with spam, phishing email examples [duplicate]

I'm working on a little project trying to see if I can predict the likelihood that an email is in fact a security risk (phishing, spam, social engineering, etc). I order to do this I need to have a ...
1
vote
4answers
494 views

How can these spam emails be accessing email accounts on respected domains?

Today I received a spam email from juliew@mchs.org.au requesting to contact Harry Black about a charity project. His email address is harryblack2013@rogers.com. After I had done so and fallen for the ...
10
votes
5answers
2k 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?
7
votes
3answers
648 views

How to protect contact forms against being misused for mass-mailing?

A common function of contact forms is to send the contact message not only to the site owner but also to the person who sent the contact request. What are good measurements to protect against the form ...
4
votes
3answers
635 views

Using + for email addresses to find out who is selling your data: is it naive or is it effective?

It's pretty common among security-minded folks to fill in addresses using e.g. foo+company@gmail.com when disclosing their email address to company so that they can tell if company has sold their ...
5
votes
1answer
308 views

spam: several secret inboxes targeted at once. risk or coincidence?

I have a domain that is only used by me, with several inboxes in the format aep-x-company@domain , where i replace 'company' with wherever i sign up. This way i can detect when someone sells email ...
2
votes
2answers
854 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
9
votes
3answers
889 views

How did the spammers get this address?

A few months ago I configured a test mail server on Amazon AWS, all legit. I used a new address to my catchall-domain (something similar to, but not exactly, ...
4
votes
1answer
4k views

A “new domain registration” spam?

About 6 days ago I purchased a new domain under .org TLD from a local registrar. Few days later, I have received this strange message (which BTW fell to Gmail spam bin), which looks like some kind of ...
4
votes
2answers
1k 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 ...
3
votes
2answers
244 views

Reaction to spam from acquaintance

It often happens that I receive an email like this: From: acquaintance@herbal-viagra.com To: me@domain.com Hi, me@domain.com -- Check this out: http://herbal-viagra.com -- ...
2
votes
1answer
91 views

Why are packets constantly being sent to international ISPs?

When using a packet sniffer, I notice a lot of packets being sent to a bunch of ISPs (such as axion.ca, wanadoo.fr/orange?, bresnan.net, zebra.lt) usually all at the same time. Here's a screenshot of ...
1
vote
1answer
1k views

How do botnets deliver spam? [closed]

I can't seem to find the answer to this question. I read that botnet bots are used as email relays (they have smtp servers installed). Wikipedia on Open mail relay: "(...)Internet initiatives to ...
0
votes
1answer
89 views

“Secure” emails from unfamiliar source(s)

The context is long, so I'll ask my question first. If an encrypted message is received from an unfamiliar sender and it's spam, how can I avoid receiving further messages of the same sort? If it's ...