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

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4
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3answers
401 views

How to check that an e-mail service provides encryption between the mail servers?

How can I technically verify* that the e-mail I'm sending from Gmail to Yahoo is encrypted all the way from Gmail's servers to Yahoo's servers? I know that it's advised to have encryption between the ...
4
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4answers
2k views

Is there any way to set up secure email for Network Solutions domains? [closed]

I'm trying to set up any mail client to have a secure connection to Network Solutions' email servers. I've been talking with Network Solutions' email support people, who will repeatedly state that ...
4
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1answer
40 views

How accurate the recent activities location provided by Microsoft emails

One of my emails is on hotmail.com provided by Microsoft. Recently, after few suspicious incidents where my computer was hacked and many other accounts, I changed all my passwords including this ...
4
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2answers
449 views

Passwordless login over email - security considerations

I'm proposing the use of a login system that sends a one-time login token (with high entropy) via email to the user. After using the token, the user receives another token via email and the previous ...
4
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1answer
1k views

Keep receiving delivery failures for emails im not sending

I have my own domain, and a few email addresses on it, including a catch all address, with Google Apps. Recently, my catchall address has been receiving "delivery failure" emails from many different ...
4
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1answer
81 views

Opening mail from IMAP with no risk for the user

I'm building a website for an association. Its aim is to, out of other thing, provide an easy mail manager to communicate with the member, stored in a database. This database is always up to date as ...
4
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3answers
337 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 ...
4
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2answers
167 views

Security implications of storing email attachments on Centos Server

There is an application I am working on which requires processing the incoming mails to cs@company.com. The company.com mail accounts are being run via Google Apps for Business. So I fetch the ...
4
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2answers
221 views

How to refuse delivering emails that are not signed by trusted PGP keys?

I'm fed up by spam and would like to have an email address that will only deliver mails signed by users I declared trusted. Some kind of purgatory for mails the signatures of which are trustworthy by ...
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3answers
1k views

What is the most secure way to send emails using PGP?

I am a PGP beginner, having just downloaded GPG for OS X. I created my first pub/sec key for my email address and uploaded it to the public key server. GPG has several features available, namely: 1) ...
4
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1answer
93 views

Securing an IMAP service

I need to secure an IMAP service running on dovecot. Which wrapping layers of security can I enhance security with? I am using most of the built-in dovecot-specific security features, like ...
4
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2answers
121 views

Is using a self signed certificate safer than a free ssl certificate? [duplicate]

I have a personal website/email server, basically for my own self learning use. I am using CACert (http://www.cacert.org/) for my SSL certificate as advised in a tutorial. I have no clue about ...
3
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4answers
571 views

What Gmail features should be Opted-Out to prevent PII from being indexed?

The Massachusetts and Nevada PII laws require all email with SSNs or other personally identifying information to be encrypted (TLS or otherwise). Of the free email providers, GMail does support TLS ...
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6answers
20k views

Possible ways to track down anonymous mail senders?

In my previous post here How can I send emails anonymously? the community framed and guided how we can send an anonymous emails through various ways which makes me thought about the following things ...
3
votes
4answers
2k views

CAPTCHA or email confirmation?

I have read that captcha isn't a perfect solution to protect a website where for example the user can create an account, since there are many people in different countries that practicallty read ...
3
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4answers
409 views

Mitigate resend confimartion email flooding

While writing server code for resend confirmation page something came to my mind: an attacker could make several requests to /resendemail?user=blah (example URL) and flood such user with registration ...
3
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4answers
345 views

How to detect self destructing emails? How to prevent from self destruction?

Recently I came across a gmail extension for Chrome browsers which claims to send self destructive emails. I tested by sending self destructive emails to my email account and it works fine Now my ...
3
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6answers
254 views

Does an email signature increase security?

I'm using Thunderbird with Enigmail. It has both encrypt and sign options for sending PGP emails -- but why is an email signature needed? It just looks overkill to me! Alice and Bob can use PGP to ...
3
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2answers
351 views

Is my email client violating my privacy?

There are many ways that emails can be used to violate the privacy of the recipient (Return-Receipt-To:, web bugs, iframes loaded from an external page, and other email tracking methods). It may be ...
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2answers
1k views

I'm currently receiving a targeted attack

Since yesterday, I receive forged mails which are targeted at me. They use personal information, seem to come from one of my friends and only contain links to these web sites: http ...
3
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5answers
8k views

How commonly are SSL/TLS or S/MIME used by e-mail providers?

I was reading through different posts here about email security. After reading these I still have some questions. I understand that S/MIME can be used to transfer email securely between servers. ...
3
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3answers
2k views

How “enforcable” are email disclaimers

Perhaps a more policy questions, and undoubtedly different in differnet parts of the world, but enterprise email "signatures" often include a snippet simmilar to the following: This email and any ...
3
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3answers
613 views

Encrypting an email server's local drives or filesystems

Planning to deploy a remote hosted mailer (Zimbra based) I need to make sure the local data on the machine is encrypted. Currently, the plan is to use the built in LUKS to encrypt /opt/zimbra and ...
3
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3answers
400 views

How to know if mail is for tracking our IP

Consider if I have got a mail from a colleague on my GMail, and it has got some images or attachments in it. Gmail asks for "Show Images" option to explore images. My query is that how can we get to ...
3
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4answers
980 views

Exchange 2013 blocks txt file attachments - are there security reasons?

My Exchange Admin is setting up 2013, and it is set to block txt file attachments specifically (as well as others). I have tried searching for risks associated with txt attachments but could not ...
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3answers
3k views

Email hacking myth

I never believed that some one can actually hack an email that easy. If someone hacks an email it means he actually hacked the server and he will gain access to many emails not to mine only. Anyway ...
3
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3answers
356 views

I found a malicious website embedded in Malware spam. What should I do?

An email is using social engineering to get users to click on a malicious URL that downloads javascript and then runs malicious code. Who should I report these malicious URLs to? (Microsoft ...
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4answers
3k views

How can an internet contest verify unique votes with only an email as an input parameter?

For my computer security course we are brainstorming different ways to use attributes for a unique user (that are readily available over a network) to prevent various mischievous activities. We've ...
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3answers
310 views

I stupidly responded to an email from a hacker posing as a friend

I responded to an email from a hacker posing as a friend in distress. I have a really long secure password ... caps/special figures/numbers/over 14 characters long. My account name is my first, ...
3
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3answers
5k views

Suspicious email with my information in it: what do i do?

I just received this email: Billed To: d**********@****.NET John ****** Order Number: M1V62***2711 Receipt Date: 07/12/12 Order Total: $699.99 Billed To: Credit card Item Number Description ...
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3answers
654 views

Sending an encrypted PGP email to someone who doesn't yet have my public key

Suppose I have the public key of a recipient I'd like to send an email to, and I've never sent this person an email before. Does it make sense to encrypt my first email to this recipient and also ...
3
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4answers
150 views

How webmail's authorisation should work?

I'm building a webmail client (like gmail). It allows the user to browse emails and send them. Under the hood, php uses IMAP and SMTP to talk with email server. user->webserver->mailserver When user ...
3
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3answers
2k views

Will SHA1 of Email Addresses Always be Unique?

We want to store data about a person without storing their email address, but we want to latter connect that person with their data upon them supplying their email address. Storing a SHA1 of their ...
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1answer
426 views

If most companies do not enable TLS for SMTP and IMAP, should we consider email not secure at all?

Many of our partner companies's email service do not enable encryption. Does that mean our email is not protected at all?
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3answers
2k views

Email security and Home Mail Servers

Suppose you're truly paranoid (I assume the majority here identify with this?) and you don't want Google or other email service providers reading your email (to serve ads, etc). You don't want your ...
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3answers
2k views

Will using a self-signed SSL certificate on a mail server hinder communication?

According to this ArsTechnica article, using a self-signed certificate on a mail server is a bad idea: When we set up a Web server in our previous series, getting SSL/TLS working was a ...
3
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2answers
911 views

Can unencrypted email be read or altered while it is in transit?

If email is not secure while in transit, exactly how can it be read by unintended parties? Can an attacker read SMTP traffic while it is between the sender and recipient?
3
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3answers
118 views

Are mail-servers removed from security concerns in contrast with cloud storage?

I have meet people and even businesses that are against using the cloud for data storage invoking security risks. In the same time they seem perfectly fine using email services (usually from obscure ...
3
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2answers
282 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 ...
3
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3answers
95 views

Any Security Risks for using mailto:?

I use a PHP script which performs a database search and when no result are found, user is presented with a mailto link with this format mailto:example@test.com?subject=SEARCHED_QUERY_HERE The ...
3
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3answers
694 views

Two-way PGP email without publishing your key / address to a key server?

If I want to have some privacy and avoid the attention of publishing my email address to the public key server web of trust, yet have a secure two-way email conversation with one recipient, what are ...
3
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2answers
82 views

How do I respond to a spam server that invalidates my tokens? [duplicate]

Our web application sends a one-time use generated token, in the form of an URL, to clients who forget their passwords. This works except for the case where the client is sitting behind another server ...
3
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3answers
171 views

Recovery email for email services

The famous Mat Honan hack got me thinking about e-mail password recovery, and how any link in the chain can break all the links preceding it. In Mat's example, that link happened to be the last link, ...
3
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1answer
202 views

Why shouldn't I sign my email newsletter using an s/mime email certificate?

I currently offer email subscriptions on my blog, something I coded myself in PHP. People sign up on the blog using their email address. I send them an email with a link to verify their email address ...
3
votes
1answer
204 views

My server was used for sending spam. Will our server ever be trusted again?

A while back I enabled SMTP on my IIS server with the intention of using it for internal email notifications. It seems that somehow hackers were able to use it for sending out thousands of spam ...
3
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2answers
565 views

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?
3
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1answer
1k views

The security of sending emails with SPF/DKIM, but not signed

We're using an email sending service (fairly known) to send our emails. We made DNS changes so that emails going through them would pass SPF and DKIM. A few days ago we noticed that they allow any ...
3
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3answers
607 views

Should email verification links be 'time limited' after user registration?

Regarding web application user management, I understand that password reset links are effectively "password equivalents", and therefore it makes sense to limit them to one use only and also make them ...
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2answers
2k views

Send credit card info by email from HTTPS and SMTP on SSL

A client asked me to receive credit card info of his costumers by email. I know that is a very very not secure way ... But if the page with the input form is on HTTPS, and then i use a smtp (like ...
3
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1answer
3k views

What algorithm/encryption type does Gmail use for security?

In the wake of the recent database hacks, i.e. Sony, Gawker, etc.. where the hackers have access to the hashed usernames and passwords, i've been more keen in paying attention to the sites and ...