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

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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 ...
7
votes
5answers
2k views

Privacy issues with email providers [closed]

I am looking for an email provider (or for a way to do it myself) that will not divulge my personal information under no circumstances. I found out that getting this information with a order for ...
7
votes
3answers
496 views

How Reliably do mail systems transmit Encrypted PDFs

We have an solution design that will be sending Encrypted PDF's to our many clients, who will all be using varied email providers. We have tested the pdf's through the usual cast of internet mail ...
7
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4answers
422 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 ...
7
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2answers
470 views

Is personal email hosting really secure?

One of my friends has his own personal email hosting. Let's assume for the sake of argument that it is "secure", meaning that no third party can read the emails in his server either through hacking or ...
7
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2answers
1k views

Best practices for email security

I writing a security layer for my app and I would like your input on updating users' email addresses (also used for the login). I'm interested to hear from anyone who has written an application with ...
7
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2answers
2k views

If I send an email over SSL, will it always be transmitted over SSL?

This is largely a question of how MTAs and different components communicate. I'm curious that if I send an email using SMTP over SSL to my MTA, can it's next jump to the next MTA or MDA be insecure? ...
7
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1answer
2k views

Email SSL security?

I use IMAP and I only access my email through SSL. However, the settings for encrypted email access seem a bit more complicated that https. Can someone explain the security implications of the ...
7
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3answers
832 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 ...
7
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2answers
486 views

ProtonMail security concerns

This TED talk brought me here. First of all, to those who created ProtonMail: Nice job!!. Regardless of what people say, it's definitely a big step forward from tradition options like Hotmail, Gmail ...
7
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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
1answer
291 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 ...
7
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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
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2answers
64 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
313 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
19k 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 ...
6
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5answers
1k 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
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 ...
6
votes
5answers
833 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
4answers
324 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
271 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?
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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
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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?
6
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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
328 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
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3answers
9k 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 ...
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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
3answers
202 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
577 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
169 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
266 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
211 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
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3answers
700 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, ...
6
votes
1answer
187 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
2answers
100 views

Should I be worried if somebody uses my email to sign up for accounts?

I recently received e-mails from two services: Paytm and Uber. They both seem like legitimate services. However I have no idea why I received these e-mails or why somebody would want to create an ...
6
votes
2answers
629 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
131 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
183 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
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2answers
720 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
381 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
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
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3answers
5k 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
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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
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1answer
2k 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
695 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
1k 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
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2answers
506 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
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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
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2answers
283 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 ...