Related to email protocols, clients, servers, content, and message format.

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7
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4answers
5k views

How can hackers guess passwords (using dictionary attack or brute force) without being locked out?

Nowadays almost every website you want to register in; is asking you to create a complicated password...But why cant we use simple passwords? I am just wondering because in case of multiple wrong ...
7
votes
2answers
2k views

secure webmail provider

Which email providers (e.g. Gmail, Yahoo, etc) offer the most robust security for a personal email account? The recent article about Mat Honan getting hacked illustrates the challenge. The account ...
7
votes
2answers
9k views

is it possible to use smime in the webclient of gmail?

I could not find any options in the webinterface of Gmail. all I could find was a Firefox plugin to use SMIME with Gmail, but it seems to be outdated
7
votes
2answers
7k views

Malicious users trying to create yahoo accounts with random emails at my domain?

Recently, I have been getting a string of emails from yahoo with people trying to create accounts or add email addresses @mydomain.tld to their account. I was wondering if anyone else has seen this ...
7
votes
2answers
57 views

Does Outlook “trusted domain” actually do any sort of checking?

When you receive an email containing pictures from a new domain in Outlook you can right-click on the address and "Mark this domain as trusted" which will autoload all the photos on future emails. ...
6
votes
3answers
290 views

How do I securely exchange server logins with remote developers?

I work for a virtual organization (we're all remote) that uses a lot of freelancers/subcontractors. Very often I need to exchange SSH login information with developers working on projects for us. How ...
6
votes
5answers
996 views

Is storing plaintext passwords for email accounts any less bad? [duplicate]

I recently found out that the company I use for shared hosting stores passwords for email accounts in plaintext (they mentioned this to me incidentally, while troubleshooting another issue). They're a ...
6
votes
5answers
793 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
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 ...
6
votes
4answers
296 views

Circumventing a “freemail” account form filter

I'll be honest - I want to download a free PDF from a website which requires me to enter my "non freeware" email address. I do have them, but I dont want to use one as I'm afraid of landing up on a ...
6
votes
4answers
269 views

Technical security issues with proactively executing a phishing campaign targeting your own users

We've had some issues with compromised accounts due to users falling victim to phishing campaigns. The possibility of us doing a phishing campaign against our own users to proactively shame them has ...
6
votes
2answers
1k views

Can someone know my IP address through Thunderbird email attachments?

Can someone know my IP address through Thunderbird email attachments? Can a cunning attacker manage to find my IP address through attachment 'images' in emails that I unsuspectingly open?
6
votes
4answers
4k views

Reporting a GMail hacker attack

This morning I found 17 e-mails in my GMail outbox that I didn't send. The e-mails were sent to seemingly random people from my GMail contacts and contained the link to a suspicious php file on ...
6
votes
2answers
2k views

Is e-mail a direct vector for XSS

I'm curious if there is a way to execute XSS via email. I am not talking about using e-mail as a way to deliver a link that has reflected XSS in it. I'm talking about sending an email from ...
6
votes
4answers
9k 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).
6
votes
2answers
315 views

Is DKIM needed for emails encrypted with OpenPGP?

DKIM seems to prove that a message came from where it claims to be from. However, OpenPGP encrypts the entire email and signs it which obviously proves it also came from the person it says it did. ...
6
votes
3answers
8k views

Is it possible for a phishing link to install a major virus on a Mac?

My girlfriend recently had her university MS Exchange account hacked. The attacker took over her email account and started using it to send thousands of spam emails. After a while, her email account ...
6
votes
2answers
2k views

With reference to using Gpg4win, which is better: OpenPGP or S/MIME?

Which is better -- OpenPGP or S/MIME for higher security?
6
votes
1answer
611 views

Can my ISP read my gmail even when using HTTPS? Is there a way to prevent that?

Can my ISP read my gmail or other email even when using HTTPS? I guess they can do that since they are the "man-in-the-middle". Is there a way to prevent that? This is related to the news that in ...
6
votes
3answers
201 views

Is there any sense in using two-step authentication for personal email address?

There is two-step authentication available at gmail and outlook as well. There are some using it, but the majority doesn't. In what cases it is recommended? If I have a strong password what are the ...
6
votes
3answers
475 views

Is there any security reason that mail services like gmail or yahoomail limit the size of file attachment?

Despite the fact that Email standards such as MIME don't specify any file size limits, but in practice email users will find that they can't send very large files(more than 20 or 25 MB). Some experts ...
6
votes
3answers
168 views

Obtaining e-mail address at registration

In a registration form the user is asked for his e-mail address. The e-mail address will be validated for the correct format (e.g. at the least contains @) and I'm considering checking if it's already ...
6
votes
2answers
251 views

Have both my email address and IP been spoofed, or has someone gotten my password, or…?

Just examined a spam email sent to me. The header's "originator" has both my email address and my web site's IP address, (my SMTP). My first thought is that someone has obtained my email password ...
6
votes
3answers
185 views

Why can't PGP/GPG Web-of-Trust be automated?

We heard lots of complaints about hard to use crypto tools, and recent ideas of Google how to fix this. I had another idea about this which seems quite obvious, but couldn't find anything about it on ...
6
votes
1answer
184 views

What's the best duration for storing e-mail? [closed]

We’ve all become so accustomed to using email in our daily personal and working lives that we really don’t give a whole lot of thought to it. It’s the fastest way to communicate with others in the ...
6
votes
1answer
278 views

Fake email messages via List-Unsubscribe header

List-Unsubscribe email header makes it possible to recipient to automatically unsubscribe from the mailing list: List-Unsubscribe: <mailto:list@host.com?subject=unsubscribe&body=qwe> Free ...
6
votes
2answers
614 views

what are some instances of compromises due to email sniffing?

Since emails are usually sent in plain text and bounced through a bunch of SMTP relays it is potentially possible for a well placed attacker to sniff for these and read emails without being able ...
6
votes
3answers
126 views

Is e-mailing personal information significantly riskier than transmitting the same information another way?

I've been asked by bankers, school administrators, insurance agents, car salesmen, realtors, you name it to send them all kinds of information over e-mail over the years. Everything from my address ...
6
votes
1answer
166 views

Reading older mails signed with a certificate that has meanwhile expired

A few years ago I have used S/MIME certs to sign (and encrypt) my mails. The reason for which I stopped signing was the following: My (class 2) cert was issued on Jan. 1st 2008 (just a sample). It ...
6
votes
2answers
705 views

The safest way to access GMail on mobile devices

There are three ways to access your GMail account on iPhone or iPad devices: 1. Use safari browser 2. Use Apple's default mail app 3. Use Google's Gmail app What is the safest way to access gmail ...
5
votes
6answers
358 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 ...
5
votes
5answers
17k views

Email headers from messages sent via Gmail online client contain private IP addresses. What are these addresses?

Someone has sent a sensitive email from my Gmail account. I wanted to trace the IP address by checking out the Received: by X field in the header of the sent message. However, every message that is ...
5
votes
6answers
5k 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 ...
5
votes
5answers
4k views

How secure is using CRAM-MD5 for email authentication, when not using an SSL connection?

Background: My current server-provider tells me it's no problem to store the passwords in plain-text in the database, saying he has to do so because they use CRAM-MD5 for email authentication. My ...
5
votes
3answers
3k views

How to Stop Email Spoofing [closed]

Apart from SPF, what else can be done to stop hackers from spoofing your company's email addresses?
5
votes
7answers
4k views

Can I reclaim ex employee gmail account?

This is the best place in SE I can find to post this. We have an ex employee who created a gmail account for work purposes that looks like staff_name.company_name@gmail.com He left the company and ...
5
votes
1answer
1k views

is it possible to sniff email content inside network?

I am working in a IT company. I am using LAN for all internet activities. I send some email from my personal gmail account. My network administrator sniffed all email I send from LAN and he shows the ...
5
votes
5answers
677 views

HOWTO : Email encryption in a browser

I have read about encryption and I think it's a good idea for me to encrypt my email. I run ubuntu 12.10 and use Firefox for browsing. In my quest for learning how to use gmail/hotmail to send and ...
5
votes
5answers
946 views

Is snail mail or HTTPS webmail safer for sensitive information?

I've been curious about the safety of e-mail lately. As far as I know, the most vulnerable point of communication is the local network you send your mail from. That is unless you're trying to keep ...
5
votes
2answers
497 views

How might an email do damage merely by being opened?

E.g. http://www.dailymail.co.uk/sciencetech/article-2094982/Threat-new-virus-infected-emails-PC-DONT-open-attachments.html?ito=feeds-newsxml Assuming that the user clicks no links and opens no ...
5
votes
3answers
1k views

Is TLS flawless enough to prevent eavesdropping carried out by an ISP?

I would like to "secure" my email, http servers and desktop client by connecting exclusively over TLS, be it email, in/out:80 or just regular "web surfing" traffic. Will that prevent ISP and ...
5
votes
4answers
2k views

Email header IP address

Do the IP addresses in an email header include information from the device from which the mail is being sent, or from the mail server?
5
votes
2answers
235 views

Should you let users know if an email has been taken during registration validation? [duplicate]

In many web applications, email is required to be a unique field, and users aren't allowed to register an account if their email already exists in the database. When performing validation on the ...
5
votes
7answers
2k views

Is PGP combined with a regular web-based email service secure?

With the disappearance of private email services like Lavabit and Tormail (http://www.dailydot.com/news/email-anonymous-hushmail-lavabit-nsa/) it seems that we will need to resort back to standard ...
5
votes
4answers
474 views

A Secure Email Host Architecture

How would one go about creating a secure email architecture? I'm thinking specifically about protecting email from routine surveillance from oppressive regimes and corporations. I had a think about ...
5
votes
6answers
20k views

Is update@em.facebookmail.com legitimate?

I'm having a hard time figuring out whether this email a friend of mine got is legit or a scam. The weird thing is there's only one link to facebook.com, which is the one about facebook terms. All the ...
5
votes
3answers
410 views

Are there any regulations against financial companies storing passwords in plaintext?

A bank that I use stores my password in cleartext or perhaps using reverisible encryption, which is just as bad. I know this because when you click "Forgot your password?" (or similar) link, it ...
5
votes
1answer
352 views

Is it safe to abandon a free webmail account that has been in use for a significant amount of time?

I have a free webmail account that I have been using for around ten years now. Over the past two years I have almost phased out using this address. I have concerns around accounts that I may have ...
5
votes
1answer
901 views

Thunderbird - what happens if Gmail SSL cert gets spoofed?

I use a good MUA: Thunderbird [to read/reply to my emails on Gmail]. So: what happens, if i go to a place, where is public wifi, and someone tryes to sniff my password/username/emails? Questions: ...
5
votes
3answers
5k views

TLS library problem when connecting to Dovecot

I have a Comodo PositiveSSL certificate issued for mail.btcontract.com and I've set up Postfix and Dovecot to work with it in the following way: Postfix main.cf: smtpd_tls_cert_file = ...