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

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2answers
891 views

How to Check if my mail is classified as Spam

I think several of mails are classified as spam.But Gmail and other Public Email providers has no issues. It might be a false positive cases with the associated tools Is there a tool or a way by ...
3
votes
2answers
179 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, ...
5
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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
92 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 ...
6
votes
4answers
294 views

Circumventing a “freemail” account form filter

I'll be honest - I want to download a free PDF from a website which requires me to enter my "non freeware" email address. I do have them, but I dont want to use one as I'm afraid of landing up on a ...
7
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3answers
343 views

Is it secure to have an “email no longer available” feature on your registration form?

I was just implementing a new feature on the registration form of my site that checks if an email address is still available to register an account with. I am wondering if it is secure to show a user ...
3
votes
1answer
126 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
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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 ...
3
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1answer
202 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: ...
1
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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 ...
0
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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
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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 ...
2
votes
3answers
188 views

Security of email sent/received on iPhone via Mail app

In regards to the default Mail app on iOS 8, setup with various mail accounts gmail, outlook etc. Are emails sent/received to/from the phone securely, if so, how? Can someone who is snooping on the ...
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 ...
0
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2answers
708 views

Does Thunderbird send IP address?

I send my gmail emails from thunderbird (on Ubuntu machine). I am wondering whether thunderbird sends out the IP? If so, how can I hide my IP from the outgoing emails?
2
votes
1answer
279 views

Making a bitcoin-like secure mail protocol, how to tackle public keys?

I'm making a new mail protocol (probably already exists, but I've learnt a lot of things about security and privacy on the way). Here's the summary(much simpler if you know bitcoin's inner workings): ...
2
votes
2answers
87 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) ...
0
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1answer
187 views

Is my Postfix and Dovecot configuration secure?

Today I set up my first server with Dovecot and Postfix. These are excerpts from the configuration files: Dovecot: disable_plaintext_auth = yes ssl = required ssl_prefer_server_ciphers = yes ...
3
votes
1answer
67 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, ...
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. ...
10
votes
3answers
333 views

What are common/official methods of reporting spam/phishing/nasty-grams to organizations?

A user of mine just received a phishing email claiming to be the IRS. What methods of reporting are available, and what should be included?
18
votes
5answers
8k views

Is this “Domain Registration Service” email a scam?

I received an email to the email address listed on our website (it's a generic info@ourcompany.com to help "weed out" spam, whereas each employee has something like andreas@ourcompany.com to which I ...
1
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2answers
336 views

Getting Loads of Emails 'linking' my account to Gmail accounts I know nothing about

I have just come out of hospital and have in the region of 30 e-mails from gmail over the past few days 'linking' a gmail account to my (hotmail) email address. I have not done this once never mind ...
1
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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, ...
1
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2answers
2k views

My certificate seems fine but my TLS fails (Cert not validated)

I set up my certificate for my mail server at https://mail.xxxx.com/ I exported my certificate as described in my mail servers documentation and pointed to it in the server settings. The certificate ...
3
votes
3answers
543 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 ...
1
vote
2answers
111 views

is this secure: email account that can only be accessed by sending and receiving emails within gmail

i am creating a game of sorts where you use and earn credits to accomplish tasks. I am curious if you can effectively use gmail's security features to secure these submissions if the emails are all in ...
12
votes
7answers
7k views

Forgotten password or reset link, which is more secure to email?

I originally posted this as a reply here in this thread but didn't get much feedback on it, and now I'm curious as to what others think is the best approach, or if there is any difference between the ...
3
votes
1answer
104 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 ...
1
vote
1answer
127 views

Email account password change via email-to-script

I host a mail server (postfix and dovecot) and I wish to set up a password change feature (especially useful when creating a new address provided with a temporary password). Does my scenario has ...
23
votes
6answers
3k views

What real world benefits does PGP have over sending email with SSL/TLS such as with HTTPS?

I've been learning about PGP, and I asked myself, "Why?" For example, if I'm using https://mail.google.com, then what benefit would adding PGP offer that would justify it being used? I can ...
2
votes
3answers
202 views

Fake “FROM” email to allocate to account

We are allocating emails to their online account. We discovered you can send a false email with a script by changing the "from" or "reply-to" in the email header. There must be a safe way to test the ...
1
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1answer
5k views

Yahoo Account hacked, changed pw, spam still going out elsewhere?

Spam emails went out for an hour earlier this week bearing my Yahoo account in the FROM field and going out to all my contacts. I changed the password, then saw (via rejected emails sent to my Yahoo ...
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1answer
103 views

Corporation Best Practices for Encrypting Locally Stored Email Data

Since the recent Sony hacks took place, the attackers have published troves of data from users' email accounts. Some of this data is very detrimental to the company's image. I suspect that based on an ...
1
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0answers
177 views

Is hacking my own account illegal? [closed]

I have just learned email hacking and I want to test it. I am well aware that if I hack into any email account, there are chances that my email service provider will track me. So if I hack into my ...
0
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1answer
106 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: ...
1
vote
3answers
941 views

OWA Keep-Alive in http, even though it should be forced https

Yesterday, I got an alert from a client's IDS that a Base64 auth packet was detected. Looking at the ASCII decode, I can see that it is for their OWA (Outlook Web Access), and indeed, the auth info ...
4
votes
1answer
164 views

Suspecious js file sent as email attachment

I received a js file with following code in my spam folder but I decided to take a look into the file. Do anybody of you know what does this code might do? var evl='';function nr() { evl = '}; ' + ...
2
votes
3answers
293 views

How secure is an Activation Email?

Is there any risk to an Activation Email? My ASP.NET Site is set up so that a user has to check their Email and click an activation link which is made of a GUID created as their user ID in the SQL ...
1
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2answers
2k views

Google Accessed My MSN Account!

I just received a notification from Microsoft that my Microsoft account has been blocked because it's been accessed by an IP address that's never accessed it before. I received this notification as a ...
1
vote
3answers
670 views

Are Facebook, Yahoo, Google, etc. hackable?

What I would consider to be hacking one of these services is something along the lines of cracking databases (or I think what would be databases). In reality, I have no idea how sites like these store ...
0
votes
1answer
71 views

PHP: Save e-mail address hashed or plain [duplicate]

I've been wondering about something, is it more secure to store an encrypted (hashed with password_hash) email address in the database, or just as plain text? I've google'd this matter and saw that ...
0
votes
0answers
49 views

How can I secure a reply-via-email system?

I am working on setting up a reply-via-email system (similar in functionality to what Basecamp uses) in which a user can reply to an email generated by the system in order to add a message to a ...
4
votes
1answer
68 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 ...
0
votes
2answers
1k 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]) ...
18
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4answers
3k views

Would 'spam' mail really avoid eavesdropping?

spammimic.com offers a service that 'encrypts' your mail as 'spam', the rationale being that all mail services automatically filter out spam, and so if you're wanting to communicate with someone ...
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4answers
249 views

Creating a secure and encrypted e-mail service

Model People living in countries with totalitarian, oppressive and other threatening regimes should be able to use this system and have some degree of privacy when communicating. Objectives ...
2
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3answers
195 views

Could embedding website links in an email lead to more hack attempts?

My organization currently sends out emails directing our customers to login and view information on a customer portal site we have developed. The content of these emails is usually pretty generic ...
13
votes
6answers
5k 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 ...