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

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3
votes
2answers
87 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 ...
0
votes
1answer
39 views

How do I convert a GPG certificate to a CRT certificate that can be imported into Windows Certificate Manager?

I have a GPG certificate from someone used for email -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) I would like to import that into Windows Certificate Manager So ...
0
votes
0answers
40 views

Accessing the Exchange EWS API with safety in mind

I'm new to the security stack exchange, so feel free to edit the question or redirect me to another forum if this is not fitting. I'm currently working on a web application that will allow the user ...
0
votes
1answer
40 views

What is the risk of using SHA1 in PGP email signatures?

SHA-1 is being phased out by a lot of major companies due to vulnerabilities. For example Chrome no longer considers it safe for public web PKI. Is it insecure to use SHA-1 for PGP email signatures?
0
votes
0answers
30 views

Question about a forensic tool [closed]

I used the program icopybot to look for old emails. Under the "recents" section there are email addresses as well as phone numbers that had mail & SMS sent to. There are time stamps beside them. ...
2
votes
4answers
25 views

Is PGP or S/MIME useful when both servers are self-controlled?

With regards to encryption and preventing a 3rd party from viewing my emails (and ignoring validity/signing), is encrypting an email via PGP or S/MIME useful when I control my server and my recipient ...
1
vote
2answers
35 views

Dealing with Spam with an unkown party harvesting the email address [closed]

I have a situation where I keep receiving spam from several IT companies (solicitations, marketing etc.). I think I gave away my email to a company in the last couple of years for reading a white ...
15
votes
9answers
3k views

Hide the fact of e-mail communication

Bob has a mistress. Her name is Alice. Bob`s wife Eve knows Bob is unfaithful, but she does not know who the mistress is. Alice does not know Bob is married. Bob needs to communicate with Alice over ...
1
vote
1answer
35 views

How someone would routinely email out a Google Doc [closed]

I have seen an issue where an account has been compromised and someone is routinely emailing out the contents of a google doc to another gmail account. The account password has been changed and the ...
1
vote
0answers
24 views

Website Link in Signature corrupted while transmission [closed]

We placed our website link in our email signature for last one week. This link apparently converted into something corrupt, so all our mails gets bounced. We scan our web server files using ClamAV ...
0
votes
2answers
32 views

Does forwarding email result in an extra “persistence” of it's copy?

I understand that when an email is sent from point A to B, it can persist in other locations while in transit from A to B. When forwarding email, can this increase the extra locations where one's ...
0
votes
1answer
37 views

Framework behind password reset mechanism

I have always seen those "Forgot password" links from web sites that requires some form of user login. Can I get a deeper understanding of how this works? What tools/framework do I need to use because ...
4
votes
3answers
150 views

How do I recover from an email breach?

I recently reported a religious figure who gave me extended harassment lasting a period of months. Details preferably withheld for now. A few days ago, I noticed something a little bit off from my ...
11
votes
3answers
278 views

What email addresses are treated as trusted?

Windows Live recently suffered a security incident because they didn't realize that email addresses like administrator@live.fi are considered "trusted": some certificate authorities will consider ...
0
votes
0answers
37 views

Webmail for both deepnet and clearnet [closed]

I am looking for a free anonymous encrypted webmail I can access from both tor and the clearnet (i.e., no .onion) that is not based in the U.S., Canada, or in any way connected to a U.S. company.(I ...
0
votes
1answer
31 views

How do apps tell if there is a problem with ssl?

Email clients and other software use ssl. But what if someone is doing a mitm with sslstrip? how can i tell?
5
votes
1answer
130 views

What are the security differences between SMIME email and PGP email? [closed]

Outside of key distribution, and specific to the technical details relating to encrypted email data (message body), what's the difference between SMIME and PGP? Example comparisons Security ...
21
votes
2answers
1k views

Does this CSS code expose if a message is read, and how long they have been reading it?

This email analytics company offers an 'engagement metric' that shows how much time someone spends looking at an email, whether the email is printed or deleted. They also claim it works in pretty ...
0
votes
1answer
26 views

Outlook Client and DKIM [closed]

We have our domain email setup with SPF and DKIM - both which seem to be operating normally. When sending emails from webmail, DKIM (and SPF) are working correctly. We have some users using Outlook as ...
1
vote
0answers
31 views

what security features a good Email Service Provider (for marketing) should have?

To choose the right Email Service Provider (ESP) for e-mail marketing processes, what are security requirements and checklists that we should pay attention to and ask for from vendors? In other ...
1
vote
2answers
129 views

Would Axolotl Ratchet protocol be suitable for encrypting email communication?

Axolotl Ratchet is used by Textsecure and is an enhanced version of OTR in a way to make it suitable for mobile applications, which has the probability to encrypt messages without both parties to have ...
3
votes
1answer
63 views

Any reason for a user to use an email scanner if they don't use any offline mail clients?

I typically recommend that users enable a real-time email scanner (aka a mail shield) in order to detect a possible vector used by malware. Even if they don't use an email application, the rationale ...
2
votes
3answers
149 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 ...
8
votes
2answers
457 views

“Secure” third-party inbox

My business sometimes receives emails from our clients that are sent through a "secure" third-party inbox. The client send the message through this third-party service. The third party creates an ...
3
votes
4answers
391 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 ...
5
votes
2answers
127 views

How to safely display html emails like gmail does it?

I'm building a webmail, which must be able to display html emails. But how to prevent xss and similiar attacks, while not loosing html formatting? In gmail, when I receive some emails from, lets say, ...
-2
votes
0answers
33 views

are there commonly known risks of PHP generated email? [migrated]

In the following code, an email is sent via PHP, Apache, and Linux. A comment from a website user, $comment, and her $emailFrom address, are obviously potentially of an unknown nature. Do these fields ...
0
votes
0answers
12 views

generating public/private credentials for MS Outlook email encryption [migrated]

An app running on a CentOS 7 web server needs to receive encrypted emails sent from users of MS Outlook. Can someone please provide explicit instructions as to how I can generate or procure all of ...
0
votes
0answers
6 views

What Exchange permissions are given to each receive connector? (Bypass SPAM, etc) [migrated]

Exchange has a list of permissions that are assigned to each connector based on the checkbox selection below. Here are an example of some SMTP headers that are used internally (in routing) to ...
1
vote
0answers
19 views

How should an ISP approach Mutual Auth TLS for SMTP email? (Domain Auth Email)

I'm looking for an easy to deploy way to make email clients (MUAs) display my email messages in a secure manner. PGP and SMIME both do this today, but they are high touch, and require software or ...
3
votes
1answer
71 views

Does PKCS #7 (CMS) add assurance to an email if a CRL/OCSP response is included, then revoked?

Suppose I issue a signing certificate in January, and have a daily CRL issued (expires in 1 day) to verify the validity of that signature. Then sometime in July I need to revoke that certificate. My ...
1
vote
5answers
96 views

How to analyze spam email URLs to detect exploits?

I'm receiving spam emails that, looking at the email headers, appear to be coming from a variety of computers around the planet. They're always the same type of email that contains invalid URLs inside ...
2
votes
2answers
72 views

Using anonymous email as official email

Assuming I have created an email in hushmail through of tor, and if I use it as my official email in a site such as Github. Will it throw my anonymity away as I use github from a regular browser?
22
votes
5answers
2k views

Are web scrapers fooled by obscured emails anymore? [duplicate]

It's a common practice online that instead of writing your email as someone@example.com people will instead write it as someone AT example.com in an attempt to make it harder for web scrapers to find ...
3
votes
1answer
150 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 ...
2
votes
3answers
71 views

Businesses Handling Credit Cards via Email

I have done some I.T. contracting for a medium-sized Australian hotel recently. I am concerned about their credit card handling practices. Customers often email their CC number and expiry date in ...
2
votes
1answer
36 views

Is a ptr mechanism in an SPF record secure?

If I understand http://www.openspf.org/SPF_Record_Syntax correctly, any machine with an IP that points to my-domain.com can send email as if it's from my-domain.com if I'm using ptr in my SPF record. ...
0
votes
0answers
70 views

Is it possible to trick a CA into signing a certificate by intercepting on SSL domain validation email?

From my understanding domain validation certificate are verified by receiving an email on some special email addresses on the domain (e.g. postmaster@example.com, admin@example.com) or by sending on ...
5
votes
2answers
151 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 ...
3
votes
4answers
93 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
votes
1answer
128 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 ...
2
votes
1answer
46 views

Is e-mail authentication using a hashed ( address + string ) insecure?

I want to give a newsletter subscriber the possibility to change his information. Since we're using an external company for sending our newsletter I can't put a key right into the newsletter (or not ...
1
vote
1answer
53 views

What do I do about a forgotten, ancient PGP key?

So I just created a new PGP key because I want to start using PGP to encrypt my emails. Lo and behold, this is apparently not my first attempt to use PGP. Five years ago, I created another PGP key ...
3
votes
1answer
204 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: ...
0
votes
2answers
85 views

Could someone stop another from accessing their own online account?

Suppose Alice isn't able to break into Bob's email account, but Alice can still do damage to Bob (a VIP) if she can stop him from being able to use his own email (or any other online) account to send ...
-1
votes
1answer
119 views

Gmail disclosing your account name to recipients? [closed]

My Gmail setting has forever been set to send emails with just my Gmail address as the identifier, so it should not send out my account name (first or last name)... or so I thought! Recently I got a ...
1
vote
3answers
88 views

Strong email validation. Is it really necessary?

I am working on one of my projects where users don't need to register or login to post an advert, but they have to provide email so that a confirmation link will be sent to their email address for ...
4
votes
1answer
58 views

phishing message in Outlook signature?

One of my organization's users just showed us an interesting problem: every message they tried to send (in OWA 365) contained the following scary text: Your mailbox has exceeded one or more size ...
1
vote
0answers
25 views

Can't mail stolen session ID [closed]

I'm working on this platform: http://testfire.net/ With this script I can see the cookie: "><script>alert(document.cookie)</script> So now I'm trying to mail this cookie to me. ...
1
vote
0answers
45 views

Are old Android OS's a risk to Activesync email, and how do I block old devices?

I'm concerned that old versions of Android may be hacked through unpatched WebViews (in PhoneGap and other apps), exposing Activesync email data, and other sensitive information. To mitigate this, ...