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

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3
votes
3answers
233 views

Reading encrypted data before sent to remote server

I'm developing a mobile app (Android only for now) to provide a disposable e-mail service to users. Users will be given temporary e-mail addresses so they can receive and read e-mails for a certain ...
1
vote
2answers
59 views

Is it possible to protect the emails and calendar in an Exchange server against own Exchange administrators?

We have our Exchange server in a remote site administered by an external provider. We would like to avoid the possibility of provider employees to access the email and calendar of critical accounts in ...
3
votes
4answers
4k views

Yahoo Email Keeps Getting Phished

I keep getting spam emails from myself (and I am sending them to others as well) on my Yahoo Mail account. I have already went through two password changes which I thought were secure. My very last ...
2
votes
3answers
293 views

Are file attachments “unsafe”?

The management at work are asking, "How can we send files easily and safely to each other?", arguing that: Putting attachments in email is not safe. They want to send links instead They want to ...
4
votes
1answer
101 views

Asking for Password After Email Validation?

I do not want to discuss the pros and cons of email validation, but want to know if there are any potential downsides (security and otherwise) to a user entering his password only after he has already ...
7
votes
2answers
6k views

Yahoo mail hacked - how to recover, how did it happen and how to prevent?

I was yesterday informed by some friends that they received spam mails with my name as sender. The sender addresses look like firstnamelastname@spacepc.pt and firstnamelastname@revistaplot.com with ...
0
votes
2answers
47 views

Emailing spoofing

I've got 2 macs on a home network, as well as an iphone. I've got my own domain on Godaddy set up with an SPF record. I've changed the password on my account. But emails are being sent using my ...
4
votes
2answers
290 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 ...
5
votes
1answer
74 views

Should I have special emoticon handling for compliance, audit and logging?

I'm required to audit various communications (email, sms, messenger, social media) for keywords relating to financial data, HIPPA, and other PII. Is there any rational reason I should extend my ...
5
votes
1answer
140 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
votes
1answer
432 views
2
votes
1answer
39 views

What is the point of sending an email informing a possible break in to the same account?

There are several email services, including Gmail that for some time now sends an email informing that someone logged in from a different device. An attacker, logging into that account would also ...
1
vote
0answers
107 views

What vulnerability is this malicious document attempting to exploit

CLARIFICATION: I changed the title as people were interpreting this as a request to help understand the code. I explain what the code is doing below (critiques on this analysis are welcome.) I am ...
7
votes
2answers
360 views

Is a mail secure if it's PGP-encrypted, but unsigned when sent with DKIM?

I run my own mail server and would like to use different addresses on the same domain. If I were to sign mails from those addresses, I'd have to generate new PGP keys for each and every one of them. ...
3
votes
1answer
98 views

mailto email headers trace IP

So I'm working on a defamation case. So I will make a little overview of what is going on. The person we are trying to trace is using a site like kijiji. Tomorrow I am heading to the so said kijiji ...
1
vote
1answer
147 views

how to track IP address from which mail has been sent?

I am from India. I have get few mails from some random Gmail ID. How to get the information from which IP address it has been sent ?
3
votes
2answers
178 views

How to give “Forgot password” option for a password encrypted file?

I have created a utility that encrypts a file (.txt, .dox, so on...). The utility asks for a password from user at the time of file encryption. Problem Suppose a user has created 1000 encrypted ...
0
votes
1answer
45 views

What information should be scrubbed before posting email headers in public?

To figure out a problem, I need to post mail headers on a public forum, I read What information can be gained from an Email Header? but I'm not sure what information can identify me personally from ...
5
votes
2answers
221 views

Is it possible to infect an e-mail by accident?

Sometimes, my friends send me e-mails. I know that they don't care that much about computer security (while I care). I know that they don't know how to create an infected e-mail (no reason for doing ...
65
votes
4answers
7k views

Is using 'dot' and 'at' in email addresses in public text still useful?

When entering your email address publicly, a practice is to replace . with text dot and @ with text at. I assume that the reasoning is that this way automatic email-collector robots won't match your ...
2
votes
1answer
49 views

Can spambots access pages available to only registered, authenticated users?

I have a web application where users register and are activated via an email sent to the email address they supplied. Then there are pages that are only visible to registered users (non-user access ...
3
votes
4answers
712 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 ...
12
votes
5answers
22k views

Can the recipient of my emails know my IP address?

When I send out emails using Gmail, is my IP address being recorded? Can the recipient of my Gmail message know my IP address and thus infer where I am located?
-1
votes
1answer
68 views

Server is Sending Spam

I have determined that my server is compromised because it is sending spam (from one of my legitimate addresses). How can I determine what's compromised? Does the attacker know my SSH password? ...
1
vote
2answers
198 views

A secure alternative for e-mail

I am looking for an alternative for my current e-mail provider (gmail). I would like to gain back a little bit more "privacy" on the internet. I would like the following things: The e-mails I send ...
1
vote
1answer
55 views

What is a viable time-frame for links that expire? [closed]

Links that expire can be found anywhere from Email Verification to Password Reset procedures, I understand in most cases this is considered "security theater", but wanted to know what a viable ...
0
votes
1answer
47 views

User account password encyption by web based emails service providers?

Do web based email providers like Gmail, hotmail encrypt user account passwords when saving them to their database? If they do, why does account information get leaked after a hack?
1
vote
2answers
104 views

Email used to log in but doesn't have to be unique. Issues?

I've moved onto a project where they are implementing a system whereby a user's email address can be used multiple times by different people - i.e. users can sign up as many times as they want with an ...
-4
votes
1answer
156 views

What is the purpose of viagra spam? [closed]

We all have gotten them: The reflection of your size will stay forever in her eyes. Bigger pen!s gives you a bunch of benefits! I have girls that ring me for sex now, its amazing! Judging by ...
2
votes
2answers
441 views

Email “privacy” when sending within same domain

Scenario: email is hosted third party (think Outlook, Gmail etc.) I am sending email to another person with an email account on the same domain (think from user1@example.com to user2@example.com) ...
4
votes
4answers
2k views

Security of faxes vs emails

Background The other day a friend who works in healthcare asked me which method of communication was more secure, faxing or email. He qualified his question by saying that his office faxes patient ...
0
votes
1answer
66 views

Is it possible to forge email info in header?

I recently received an email from a guy making me a job offer for a big government company and stating that he works there. However instead of using the domain of the company, he is using GMail. ...
0
votes
1answer
42 views

Changing senders, same spam messages

We have a situation at work regarding to our mail filtering appliance and I was hoping that you could give us some insight on how to approach this issue. We've been receiving spam emails with the ...
3
votes
2answers
744 views

PayPal “Confirm your email address” spam emails? I got 3 different mails within 10 hours

I got 2 emails within 12 hours containing the following: Confirm your email address Hello [Name] [Name], Confirm your email address now to let us know it really belongs to you. Once ...
4
votes
1answer
62 views

Implemented DMARC, getting reports of canonical.com sending spam - has Ubuntuone been hacked?

I have implemented DMARC on my mailserver and for the first time I'm getting reports of an IP address trying to fake me as the email sender: >record> >row> >source_ip>91.189.90.7>/source_ip> ...
-1
votes
3answers
110 views

Are 21 characters enough to restore a PGP key?

The german e-mail hoster web.de offers PGP encryption with Mailvelope now. To transfer your private key to another browser, you can use a 21 characters long recover key. How does this affect the ...
-1
votes
1answer
418 views

SQLMAP --OS-SHELL error [closed]

root@kali:~# sqlmap -u http://www.a***********.com/info.php?id=2 --os-shell _ _ _| |_____ _ {1.0-dev-nongit-20150907} | -| . | | | .'| . | || |||||,| | || |_| ...
0
votes
1answer
61 views

Does a 'mailto:' hyperlink spoil any preceding email obfuscation efforts in PDF?

Assume there is a PDF file which contains the example@example.com email address as an image (the classic obfuscation method). However, what if this image is made clickable with a hyperlink which ...
3
votes
2answers
138 views

activate user account through email

I see a lot of people say to hash for the token on email verification when dealing with member registration. I am wondering, if the email token is only to activate the account and nothing else, ...
3
votes
2answers
88 views

Email security on a Windows phone

Let's say I set up a Microsoft account on a Windows phone and use the associated built in email client. If I send an email, would it be send in plaintext. On wifi, if someone is sniffing the traffic, ...
0
votes
1answer
63 views

How much information, at maximum, can a phisher/scammer obtain?

My iPhone was recently stolen and since then I've been receiving messages and emails saying that 'a sound was played on your iPhone' or 'your iPhone was found. Visit here to confirm your location'. ...
26
votes
6answers
14k views

How do I safely inspect a suspicious email attachment?

I received a pretty blatantly spammy email to my Gmail account. I'm not really sure how it made it through the spam filters, since it has all of the telltale signs. The FROM field is spoofed as ...
6
votes
1answer
1k views

How to reject e-mails spoofing your own domain targeting your employees at Office365?

One problem Office365 users deal with is that an external SMTP server can spoof the domain of an organization and send e-mails to the domain users; where the e-mails appear to be from employees of the ...
6
votes
2answers
2k views

How is ZixCorp able to provide email encryption without a password?

I am trying to understand how/if an email I received is being encrypted. A financial institution sent me a verifiable email (i.e. not phising) asking me to fill out a pdf form to complete a ...
8
votes
2answers
2k views

Do any Exchange hardening guidelines recommend disabling OWA Webready? Should they?

For the fourth time in over a year, Exchange OWA has put our internal network at risk due to a remote code execution flaw that exists on the server runtime. This risk is compounded by the fact ...
1
vote
2answers
102 views

How to prevent phishing mails from being successful? [duplicate]

I'd like to know what the best methods are to prevent success of phising mails. This question contains the following subquestions: What are the best ways to determine incoming phising mails (on a ...
-3
votes
1answer
104 views

How to sell a new idea – “100% secure communication”, feedback wanted [closed]

I have thought of an idea (new product) to have 100% secure communication between 2 parties and would like your feedback/ideas on how to sell it. Oh, before you start that there is no such thing as ...
2
votes
1answer
163 views

E-Mail made in Germany. Better than traditional ones like Google or Yahoo? [closed]

A friend of my mine who lives in Germany called my attention to a so called "E-Mail made in Germany" (EMiG). Since the country is well known for exporting high quality products, I decided to take a ...
5
votes
2answers
119 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 ...
58
votes
6answers
13k views

Is gmail-to-gmail still insecure? Why?

I have always heard that email is an insecure method of communication; I assume this has something to do with the email protocol itself. But when sending an email from one gmail account to another, ...