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

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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
199 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
87 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 ...
3
votes
1answer
61 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. ...
1
vote
0answers
77 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
196 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
125 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
363 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
48 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
68 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
318 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
90 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
133 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
109 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
69 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
27 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. ...
2
votes
0answers
60 views

Are old Android WebViews 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, ...
2
votes
3answers
302 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 ...
3
votes
3answers
608 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 ...
3
votes
1answer
146 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
145 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 ...
2
votes
3answers
222 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
votes
1answer
119 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 ...
2
votes
2answers
131 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) ...
1
vote
0answers
216 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 ...
4
votes
1answer
183 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
330 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 ...
0
votes
1answer
86 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
57 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 ...
2
votes
1answer
42 views

Possible for Lync (Skype for Business) to adopt Activesync-style policies?

My compliance manager recently told me that Lync IMs should be treated as e-mail for compliance purposes. This also made me realize that our other email policies (encrypted device, pin required, ...
6
votes
3answers
118 views

Is e-mailing personal information significantly riskier than transmitting the same information another way?

I've been asked by bankers, school administrators, insurance agents, car salesmen, realtors, you name it to send them all kinds of information over e-mail over the years. Everything from my address ...
1
vote
2answers
92 views

Disposable mail for anonymity

Initially asked in bitcoin, I wanted to know how is it supposed to be used for anonymity. I mean that I need to register wallets and buy bitcoins. For anonimity, guitedlines recommend to use ...
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 ...
18
votes
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 ...
2
votes
3answers
205 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 ...
-1
votes
4answers
257 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 ...
12
votes
3answers
4k views

How does the hacker manage to spoof a different IP address?

For the last 2 days, +/- every 15 minutes, someone is attempting to sign-in to my online email account. When I verify recent activity, the IP address (and the corresponding country) is different for ...
4
votes
1answer
251 views

How To Encrypt Group Emails?

I'm interested in encrypting e-mails. My very, very basic understanding is that I am to generate a private key, and share my public key with the message recipient (who will share his public key with ...
0
votes
1answer
279 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 ...
1
vote
1answer
95 views

Test if an email address is spammer's

How can I test if an email address is a spammer's? I received a reply to my Craigslist post, with a gmail address in the email body. Craigslist uses some way to hide my email addresses, if I choose ...
0
votes
1answer
49 views

Is thread's auto-login from email implementation secure/good user experience?

As far as I can tell thread.com log their users in automatically based on a token in their emails, appended to the URL. e.g https://www.thread.com/1234logmeintomyaccount-forexample This is a really ...
0
votes
1answer
160 views

Clicked link on fake email which appeared to be from friend [duplicate]

I receieved an e-mail which at first glance appeared to be from a friend, I clicked on the link provided without thinking as we would often exchance links to sites. The link went nowhere i.e page not ...
2
votes
3answers
89 views

Email Encryption

I'm hoping someone can point me in the right direction. If I wanted to implement email encryption within an organisation what would be the best way? I've been searching the web tonight but all my ...
0
votes
4answers
367 views

How can I scan hosted POP3 or IMAP e-mail for viruses?

In our company we use a hosting provider for e-mails and it seems they don't scan incoming email against viruses. And our employees does not very careful about attachments... So we deal with virus ...
5
votes
3answers
2k views

How to Stop Email Spoofing [closed]

Apart from SPF, what else can be done to stop hackers from spoofing your company's email addresses?
1
vote
0answers
48 views

Webistes listing email address lists for spammers [closed]

Which websites would you usually check if you suspect that your company's address book has been leaked and is being used by spammers? I have identified https://pwnedlist.com/ for this purpose but was ...
0
votes
1answer
51 views

Endpoint for checking if user exists in system

I have question regarding users point of view of this endpoint /api/user which requires POST data: email=user@domain.com and returns {"user@domain.com": "exists"} I am concerned if users might think ...
19
votes
3answers
3k views

How does Bayesian poisoning work?

This answer mentions Bayesian poisoning in passing and I've read the wikipedia page but don't feel I've fully grasped it. The first case, where a spammer sends a spam with a payload (link, malicious ...
1
vote
1answer
101 views

Tracking sender of Email via email address ONLY

Is there a way to track the sender and the location via the email address only. The problem is somebody has created a similar sounding email id to send content to my official circle with a view to ...
1
vote
3answers
152 views

Potential risks when sending plain text E-Mails with encrypted attachments?

To ensure privacy in communication I encrypt and sign E-Mails using gpg4win. However, sometimes the communication does not work as expeceted (GPGTools and Outlook/gpg4win seem to be incompatible). In ...