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

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1
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2answers
64 views

Are there any anti-virus programs that have a bot that clicks email links? [closed]

Just started a new job, and it looks like we have some bots that are clicking every link in some % of e-mails. The problem is, I can verify that at least a few of these people are real. The only ...
7
votes
2answers
61 views

Does Outlook “trusted domain” actually do any sort of checking?

When you receive an email containing pictures from a new domain in Outlook you can right-click on the address and "Mark this domain as trusted" which will autoload all the photos on future emails. ...
26
votes
3answers
2k views

How long should an e-mail address confirmation link last and why must it expire at all?

After a user registers an e-mail is sent to them with a link they must click on to activate the account. I know other sites have a limit on the amount of time the user has to click the link, else the ...
1
vote
5answers
158 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 ...
0
votes
1answer
188 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 ...
1
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0answers
118 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 ...
2
votes
4answers
52 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 ...
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 ...
16
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 ...
0
votes
1answer
82 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?
1
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2answers
51 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 ...
11
votes
3answers
349 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
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4answers
541 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 ...
1
vote
1answer
45 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
32 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
36 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
50 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 ...
2
votes
2answers
863 views

How to prove someone sent an email to you?

There are similar question about how to prove YOU sent an email, but I want to know if it is possible to prove a 3rd party sent an email to me. An individual sent some very threatening emails to my ...
0
votes
1answer
37 views

From a deployment and OPS perspective, should a S/MIME signing and encryption key have different expiration dates?

Assuming the client supports different keys, what is some rationale that should be considered for signing and encryption keys? The encryption key needs to be present on each device that is used to ...
30
votes
4answers
22k views

How does PGP differ from S/MIME?

Is S/MIME an abstracted system for general MIME type encryption, whereas PGP is more for email? Why would I want to choose one over the other, or can I use both at the same time?
0
votes
1answer
42 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?
0
votes
0answers
67 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 ...
5
votes
1answer
338 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
177 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 ...
8
votes
2answers
568 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 ...
1
vote
0answers
54 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 ...
3
votes
1answer
68 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 ...
6
votes
3answers
128 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 ...
3
votes
1answer
93 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 ...
3
votes
4answers
409 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 ...
7
votes
2answers
254 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, ...
63
votes
5answers
22k views

Is sending password to user email secure?

How secure is sending passwords through email to a user, since email isn't secured by HTTPS. What is the best way to secure it? Should i use encryption?
1
vote
0answers
41 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 ...
1
vote
3answers
3k views

How can hotels securely receive your credit card details (for a custom, one-off payment)?

A hotel belonging to a large chain (400 hotels in 60 countries) has just requested me to send my credit card details via standard (unsecured) email. I have negotiated a deal for accommodation with ...
1
vote
1answer
1k views

How can a gmail recipient open email in two different countries, at the same time?

I sent an email to person in Russia, and tracked it with Right Inbox, when the email is opened I get notified. The problem is I get 2 different IP addresses, one in Russia, and one in the US, both ...
2
votes
3answers
102 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 ...
56
votes
4answers
5k 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 ...
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
297 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
2answers
98 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?
3
votes
1answer
104 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
86 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 ...
1
vote
2answers
2k 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
213 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
votes
2answers
264 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
150 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
322 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
votes
3answers
512 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
682 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 ...