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

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3
votes
1answer
74 views

How to sign and encrypt mail using openssl?

I am trying to send and encrypt mail using openssl. So far, I figure I should use theese commands: cat ${content} | \ openssl smime -encrypt -inkey lib/me.crt -aes256 -subject "$titre (cs)" -to ...
1
vote
3answers
70 views

How safe is it for an app to trust a click on a link in an email?

In my question and answer application, Joe signs up, logs in and adds a question. He then shares the question via email to his trusted friends. How safe is it to provide a link within that app ...
1
vote
1answer
33 views

PCI Compliance for attachment in email

I am wondering if they are any PCI compliance issues around users of a service sending email with attachments that may or may not contain sensitive information through said service? As an example, if ...
5
votes
4answers
951 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 ...
10
votes
4answers
3k views

How do I encrypt the source and destination IP address, along with various parts of an email?

If the subject makes no sense to you, that's fine, it makes no sense to me. I've been tasked with securing emails sent from some devices, and I'm looking for advice on intelligent questions to ask to ...
4
votes
8answers
431 views

Is it possible to prove a certain email has been sent using a certain computer?

I can understand that an SMS can be traced to the mobile phone which it has originated from and the phone owner has no chance in court but to claim that someone else has used his phone but what about ...
1
vote
2answers
99 views

Unexpected emails have been sent - do I need to wipe my Android?

A few days ago I received a Notification from my Android saying that it could not send mail because an attachment was too large. I opened my Gmail App and found 5 messages in the Sent Mail folder ...
1
vote
0answers
39 views

Using email to authorize access to a user's account

would greatly appreciate some advice from the experts here on this stackexchange. I'm building an application that requires access to a user's resources from a 3rd party application. This 3rd party ...
3
votes
2answers
68 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 ...
8
votes
4answers
2k views

Good, simple list of reasons that email is inherently insecure

I've been searching for a while, trying to find a good get of information about the inherent risks of transmitting sensitive data via email. I'm really looking for a comprehensive list of all the ...
3
votes
0answers
43 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 ...
1
vote
1answer
55 views

How to share sensitive documents with unknown/untrusted parties?

My exact use case is that I'm starting a new job, and I need to transmit sensitive personal documents to support my application. However, the same applies for applying for a loan, buying a house etc ...
1
vote
4answers
312 views

Is e-mail sent from a Gmail address to another Gmail address encrypted?

Gmail provides an SSL connection and also encrypts the entire session by default. But if you send a mail, once it leaves gmails servers, it can be read at any point on the internet. But what about ...
1
vote
1answer
21 views

Can I keep large encrypted files in my mailbox on mail provider server?

Is there any restriction or policy of large e-mail providers (such as GMail, Yahoo, Hotmail and similar) for keeping/storing large encrypted files by the users within their disk quota in 3rd party ...
2
votes
1answer
3k views

What is cleardot.gif next to the senders signature in Gmail? [closed]

I am concerned that my computer has been compromised because I sent an email out - but now I noticed that there is a link in the email I did not insert, and I am worried I have a virus or something. ...
4
votes
4answers
356 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 ...
30
votes
2answers
3k views

Is email less secure than voicemail, snail mail, or internet portals for transferring sensitive information?

Where I am in the US, health care providers refuse to send anything through email (e.g. even something as trivial as an appointment reminder). Often they claim that email is not secure. Instead they ...
2
votes
3answers
60 views

Email account 'hacked'; do I need to regenerate my server's DKIM _domainkey?

I'm just learning about DMARC (DKIM/SPF), so I apologize if my question doesn't make sense. A few days after I installed a DMARC policy on my server I noticed that the reports from yahoo.com ...
3
votes
6answers
14k 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 ...
0
votes
0answers
50 views

Is this login flow via an authenticated email account safe?

I want to have users log in by entering an email, and then proving that they control that email. I only care that they do control the email, and so want to avoid add another password to the process if ...
9
votes
5answers
2k views

When registering for most websites, why do you need to confirm your email address?

I'm working on a site which allows users to sign up for a service. They choose a username/password, enter their personal details, etc and proceed into the site, their details being stored for future ...
-3
votes
2answers
56 views

Does company email can access hangouts and private emails? [duplicate]

I'am curious whether the administrator's has the privilege to access the hangouts chat and the email of employees? For example, here in our company we are using the gmail as our private email ...
2
votes
2answers
131 views

It it a good idea to whitelist inbound email using a Hash on the address? (Similar to BATV, but with DKIM)

Problem Statement I'm looking at ways to ensure that business partners, or emails from trusted senders, never get quarantined; ....in other words prevent "ham being seen as spam". Ideally this ...
2
votes
1answer
49 views

Preventing users abusing emailing feature of web application

Our web application offers users with the option to bulk email a bunch of interesting information to multiple email addresses at once. It's fairly easy to register an account with the service and thus ...
-4
votes
1answer
154 views

Trace email without header or IP address [closed]

I have a gmail address only. It is a copy of the email. I do not have the original email. Is there anyway to trace it?
0
votes
1answer
387 views

How to report abuse spam with X-AntiAbuse header which was added to track abuse?

I've received the following spam e-mail (with the link to viagra site): Return-Path: <silviani@server04.funet.co.il> Received: from server04.funet.co.il (server04.funet.co.il. [212.29.215.70]) ...
0
votes
0answers
40 views

What does proxyexec + cagefs.server mean in the e-mail X-Source-Args?

I've the following headers in the e-mail which I've received as spam: X-Source: X-Source-Args: /usr/sbin/proxyexec -q -d -s /var/run/proxyexec/cagefs.sock/socket /bin/cagefs.server X-Source-Dir: ...
4
votes
2answers
467 views

How can I prevent my E-mail address from being used as the sender for fraudulent/scam messages?

Recently, me and at least one other person I know received an obvious scam E-mail that starts off something like this: We considered your resume to be very attractive and we thought the vacant ...
2
votes
2answers
260 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 ...
16
votes
4answers
17k views

Is it possible to easily retrieve Thunderbird's passwords with access to HDD?

I know Firefox 8 stores it's passwords in a SQLite database, which can easily be stolen with access to the HDD! What about Thunderbird 8? How does it store the passwords and how can one retieve them? ...
6
votes
3answers
103 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 ...
1
vote
2answers
86 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, ...
2
votes
2answers
56 views

Secure alerting for a monitored web application

What is a good method to receive security alerts? Email is the first thing that springs to mind, although it is susceptible to MITM attacks (e.g. an attacker preventing the email from being ...
-1
votes
1answer
50 views

IP address question [closed]

I traced a header on an email I received, the person claims to have sent it from Maryland, but I traced the IP and it shows shows San Jose, CA and also contains loop backs, ??? Is this possible?
0
votes
2answers
201 views

Gmail spam from contacts. How does it work?

I don't know why it seems IMPOSSIBLE to find a blog or any security expert explaining the procedure of how this 'hack' works. My wife is receiving emails from people she's emailed through Gmail ...
-1
votes
2answers
72 views

Can passwords be figured out via public wifi? [duplicate]

Few different scenarios: 1a) On public McDonalds wifi, logging in gmail account (or any account such as skype). Can a random user who is using the same wifi somewhat intercept the signal and figure ...
2
votes
1answer
76 views

Is it possible to track the email sent via BCC List using firewall or network security software?

I want to know whether is it possible to know the conversation/email sent via BCC can be identified by admin in some corporate companies? I have heard that email sent from BCC cannot be identified, ...
1
vote
1answer
36 views

Location Obfusication and Email/remote login

Would it be possible for a user of a 3rd party VNC software package and email client to obfusicate/spoof their location, so that an employer would be unable to determine the location from which the ...
0
votes
1answer
36 views

emailing a direct link to executable file blacklist risk

I hope this is in the right place, don't know where else to ask. I would like to automatically send a download link to people that directly downloads an executable. The executable is a verified and ...
24
votes
4answers
14k views

What steps do Gmail, Yahoo! Mail, and Hotmail take to prevent eavesdropping on email?

I would like to ask what happens when an email is sent from gmail, yahoo or hotmail public web email services? I don't understand email protocols in details, but as far as I know email traffic is ...
1
vote
1answer
295 views

How to tell computer of origin sending email messages? [duplicate]

I’m not a security expert. I wasn't sure if I should post this question here or in "exploit". I have searched for answers before posting.... Could anyone tell me how I can determine if emails are ...
0
votes
2answers
102 views

Is it bad if one uses the same email address on different sites/forums?

Is it bad practice if one uses the same email address on different sites and forums?
1
vote
2answers
106 views

Are our email credentials safe with email clients?

I've been trying out a few desktop email clients (Windows) to better manage my e-mail. As I tried Thunderbird, Inky, and Outlook, it occurred to me, what guarantee is there that my e-mail/pass won't ...
-1
votes
1answer
113 views

How do I force kill an OWA, Activesync, or Outlook session?

A user with a BYOD is still able to access the email system, even after the user account has been disabled and password changed. Since it's clear that a re-authentication event doesn't continually ...
5
votes
1answer
173 views

spam: several secret inboxes targeted at once. risk or coincidence?

I have a domain that is only used by me, with several inboxes in the format aep-x-company@domain , where i replace 'company' with wherever i sign up. This way i can detect when someone sells email ...
1
vote
2answers
110 views

access to email addresses

I am taking part in an online voting photo contest. In order to vote, you have to register using your email address. Is it possible that people who run the site will be able to see my email address ...
2
votes
2answers
146 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 ...
1
vote
2answers
355 views

Are newly-generated recovery passwords sent to me via email hashed? [duplicate]

If a company sends me a new password via SMS/email because I clicked "forgot my password." Does that mean the company is not actually hashing my passwords?
19
votes
4answers
3k views

The registration confirmation email contains my password: do they keep it in plaintext?

I was kind of shocked when I just received my confirmation mail from the shop where I just registered myself: they sent my username (which is my email address) and the password I typed in. The ...
17
votes
4answers
923 views

Is it a bad idea for an information holder to e-mail a user their password?

A couple of websites with which I'm registered have, after a period of inactivity on my part, each sent me an e-mail to remind me that I'm still registered. In each case, that e-mail has included my ...