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

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6answers
3k views

How are ProtonMail keys distributed?

There is a service called ProtonMail. It encrypts email on the client side, stores encrypted message on their servers, and then the recipient decrypts it, also on the client side and the system ...
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3answers
1k 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 ...
3
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2answers
71 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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2answers
712 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?
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3answers
114 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 ...
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1answer
327 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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1answer
3k views

Spoofing email From address

Providing all legal measures are taken care of, what are some of the ways someone can spoof an email "From" field address and actually get the email to the recipient without spam filters getting in ...
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2answers
278 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 ...
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1answer
162 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 ...
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2answers
476 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?
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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 ...
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3answers
512 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 ...
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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 ...
3
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1answer
201 views

How to protect against exploitation of email addresses from an mistakenly expired domain?

I have a domain name that I have registered for a long time. Due to a combination of bad luck and oversight, the domain name expired and was rebought by somebody else. I am attempting to buy the ...
3
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3answers
22k views

Why did secureserver.net (godaddy) access my gmail account? [closed]

Why did secureserver.net (godaddy) access my gmail account? One day later...gmail reports suspicious activity...really? So...Why did secureserver.net (godaddy) access my gmail account? ...
3
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1answer
119 views

Best practices for passwords on registration?

I have a website which users register an account. On the registration field, the form fields are: Name Email Confirm email Username But there is no password field. When they hit submit, they are ...
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3answers
2k 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 = ...
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3answers
97 views

Security of remailers

A layman's question: If I don't err, with remailers or analogous systems one sends a message to a node of a chain of nodes, which collectively perform the entire transmission. However, the message to ...
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1answer
992 views

Is using Gmail's browser-based client, more secure than using IMAP?

I never use the same password twice and my passwords are always comprised of a long, random string of letters, numbers and symbols. (with an offline password manager to store each password string) ...
3
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1answer
185 views

Amavisd-New and Google safe browsing

I am studying the Google Safe Browsing. How do I know that it is possible to intercept a content of an email via amavis, I wonder if I can, for each url found, consult the Google safe browsing? Do ...
3
votes
2answers
179 views

Email & Domain ownership?

Most hosting companies, such as mine (hostgator) give the following notice when providing a contact email: Email address that you can be contacted at. This should be an email address that is not ...
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1answer
2k views

My S/MIME certificate (created with OpenSSL) does not match my email address

I created a certificate with OpenSSL and following commands: openssl req -x509 -nodes -days 365 -subj '/C=DE/ST=state/L=city/CN=hostname' -newkey rsa:1024 -keyout mycert.pem -out mycert.pem ...
3
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1answer
133 views

My sendmail started sending spam; what is causing it to do so? [closed]

Today my sendmail service started sending e-mail to various addresses. /var/spool/mail: From MAILER-DAEMON@noxcommunity.com Fri Jan 30 22:15:30 2015 Return-Path: ...
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3answers
252 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 ...
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2answers
768 views

How can an email from a Yahoo address be sent through Yahoo without authentication?

I received this bounced email, yet I have a password with 105 bits entropy, my sign in history only shows local sign ins, I do not have any linked accounts nor apps, and I have not been to ...
3
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1answer
117 views

Tracking down the source of email attacks

For the past week our company's IDS has been blocking 100-200 meeting invite emails per day from a specific client that are loaded with buffer overflows targeted at Exchange 2003. The payloads are ...
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3answers
425 views

Backup personal email on VPS - privacy, security and trust risks

FastMail.fm hosts my personal email account. Now they claim to have reliable backup services, but I'd like to have my own copy of my email archives. What I'd like to do is back up to my VPS, which ...
3
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1answer
674 views

What's a trustworthy S/MIME Certificate Provider that generates my private key in my browser?

I read this question on the process of generating a private S/Mime key. I looked at Comodo - which offer free e-mail certificates. I'm trying to find out whether Comodo generates the private ...
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3answers
732 views

Where to get/buy a CSR generated S/MIME certificate

I'm not sure if the question is eligable for this board as I ask for concrete service providers which can be kind of advertisement, but there is also technical issue involved, so I give it a try. My ...
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1answer
206 views

What is the security purpose behind the “enable editing” of MS Word?

Whenever I open MS Word documents from my email, they open in "Protected View" with edit options disabled by default. As per my understanding, the hyperlinks used in the main document would be linked ...
3
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2answers
768 views

Do fake-address generators work?

There are several pages on the Web that generate fake e-mail addresses so spammers can harvest them; the purpose is to fight spam. (Some examples of this concept under discussion and, in some cases, ...
3
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1answer
358 views

quizrace.com - Malware or just a game?

This quizrace.com quiz game is spreading like a virus all over internet forums and sites like 4cahn, minecraft etc (just google for it) - because it requires you to invite 3 friends to continue beyond ...
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1answer
67 views

Generating token for email validation and registration security

My boss gave me a list of 8K users in csv format and asking me to create accounts for them. The list have users with gmail, hotmail, and organization email addresses. I am using MVC 5 and ASP.NET ...
3
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1answer
91 views

Best approach to confirm email within mobile app?

Would appreciate your opinion on the options explored: a- Launch app and ask for a verification code that was sent to user email? b- Launch app by clicking deep link + verification code in the ...
3
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1answer
66 views

Email, Certificates and DANE [closed]

Does DANE offer the ability to provide certificates for services? Or is it just hosts? How does one specify a mail server with DANE? If my email is jd@foo.com but mail.bar.com is the email server, ...
3
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2answers
174 views

Why would an attacker try to guess random email usernames on a small domain?

My mail server has recently come under a very bizarre attack. Every five to ten minutes, a new IP connects to SMTP, attempts to try weird usernames (like pil, bennett, netscape, msfuser, desktop, ...
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8answers
2k views

Secure alternative to e-mail

After the announce that NSA conducts extensive metadata and traffic search on e-mail, it is clear that people looking for privacy and security would better abandon the system completely, since, by ...
3
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1answer
380 views

Does the Windows Surface RT or Pro (Windows 8) support local encryption of Activesync data?

Our company policy is requires the local encryption of data for all email (in case the device is stolen) Does the Windows Surface (either version) support local encryption? Is the local device ...
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3answers
440 views

Shared hosting mail server, Thunderbird and encryption

In spite of much searching on the internet, I can't really get an adequate understanding of this topic, perhaps because it combines multiple elements. As a result, I'm really worried about the state ...
3
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1answer
170 views

Facebook changed the default email address for every contact. How do I mitigate the impact and risk?

Facebook created a problem for regulated industries and Registered Investment Advisers (RIAs) by changing the default outgoing SMTP address for every contact to a @Facebook.com address. This is an ...
3
votes
2answers
351 views

Securely storing (email) lookup database

Looking for suggestions on implementing a server-side lookup table, where the key is an email address. Goal: Keep these email address private, even if data on the server is stolen. Assumptions: The ...
3
votes
1answer
484 views

Is the Netscape SMIME extension still required in a certificate?

Every Windows 7 host has a Trusted Root certificate from Entrust that has the "Netscape Cert Type" extension (see image) I'm comparing inter-operable S/MIME extensions and see a pretty diverse set ...
3
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3answers
175 views

Resources/tools for controlling access to corporate email on smartphones

If one of our employees has access to corporate email on a smartphone I want to make sure that if they lose the phone then whoever finds it can't get at any corporate email on that phone. For iOS ...
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2answers
95 views

What is the point of secure email gateways?

We run Exchange 2010. Our edge servers run "passive opportunistic TLS" for 99% of the domains we communicate with. For a handful of domains, we have forced TLS on both our end and the other domain's ...
3
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2answers
206 views

How do web email clients store my passwords from other providers?

The situation comes down to this: When I enter in hotmail, it retrieves my messages connecting to other providers: they could only do so by using my email and password. Since I had signed in a ...
3
votes
1answer
288 views

Flood of email messages from @attacker.com

I've been getting the weirdest email messages for the last 2 days on my personal gmail inbox. On May 28th, exactly at 4:33 pm BRST I got about 2,000 emails that look exactly the same, here's the ...
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2answers
250 views

Random token and email confirmation key of 10 chars sufficient?

I have a function that returns random unguessable keys with the following characters: a-z A-Z 0-9. I have set the key length to 10 and I am using that for my form tokens to prevent CRSF and I will be ...
3
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1answer
166 views

Is BSI’s process good? (Informing email address owners that their address/password (of unknown/different accounts) was stolen)

The German BSI (Federal Office for Information Security) claims to have got a list of 18 million email addresses and passwords – supposed to be the result of identity theft. They allow to check if ...
3
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1answer
152 views

Webpage sent me my password in clear text can it be secure? [duplicate]

I registered for a webpage years ago and have been using it without issues, today I made some changes to my account and they sent me an email containing my username and password in clear text. I ...