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

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2answers
208 views

What information can be gained from an Email Header?

What information is present in an Email Header that can be used to track a sent mail? For example, are some of these present? Web Browser used? Operating system Type of Network (broadband/dial up)? ...
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5answers
152 views

Is it possible for an attacker to change my sent emails content before arrival?

I have a web application that sends "change password link" to user that wants to changhe his password. The link is something like this: http:// ...
-1
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2answers
112 views

Hotmail security

Recently I've been receiving in my SPAM folder, SPAM mails sent "by me". With "By me" I mean, that I am not sure if those are really sent from me. It has been happening since December, at around one ...
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0answers
36 views

Needed: Reference data on the rate of adoption of secure email protocols [closed]

I am working on a security presentation in which I need to show that the incidence of unencrypted email protocols (e.g. POP, IMAP without STARTTLS) over the past 10 years has decreased and the amount ...
4
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2answers
134 views

Is it ok to email someone their password from a newly created account? [duplicate]

I have a pretty standard registration form. One thing I've decided to do away with is the requirement to enter the password twice, for usability reasons. In order to mitigate the increased risk of ...
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3answers
100 views

Question: How to plan email policy for start-ups?

I'm a part of a software start-up. I've the role of IT admin as well as requirement gathering (business analysis). Right now we're a team of seven people and we all are in the 'core team'. Now we're ...
3
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2answers
116 views

How to prevent email discovery in forms?

Being on the company security email list, I get emails with some regularity complaining about email discovery on various forms on my employers website. The reporters are complaining about things like ...
3
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1answer
81 views

Tracking down the source of email attacks

For the past week our company's IDS has been blocking 100-200 meeting invite emails per day from a specific client that are loaded with buffer overflows targeted at Exchange 2003. The payloads are ...
0
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1answer
59 views

How to pass an email address securely to a web application X embedded inside a web application Y

The scenario I'm trying to address is this: There is a web application Y which has an authenticated user. Inside Y, web application X is hosted (which belongs to a different domain). When X is ...
0
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1answer
69 views

Can one be infected just by reading an e-mail [duplicate]

I have heard several people say that you shouldn't even open e-mails that look suspicious, as you might be infected by a virus of some kind. Is there any validity to this? I suppose that some e-mails ...
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2answers
138 views

Security Certificate not from a valid authority

I have no real knowledge about this stuff so I figured I'd ask here for some answers. So I started to get this "Security Certificate not issued by a valid authority" error when using my email client ...
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2answers
174 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
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6answers
190 views

Does an email signature increase security?

I'm using Thunderbird with Enigmail. It has both encrypt and sign options for sending PGP emails -- but why is an email signature needed? It just looks overkill to me! Alice and Bob can use PGP to ...
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2answers
238 views

How to ensure an email address is not free webmail or ISP address?

I notice security companies such as Rapid 7 prevent people signing up with either free email accounts, or accounts provided by ISPs: ...
10
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3answers
550 views

Is Gmail showing images by default a good idea for privacy?

Google have decided to show images in Gmail messages accessed via the web, iOS and Android by default: Instead of serving images directly from their original external host servers, Gmail will now ...
-1
votes
2answers
88 views

My Email Security is Low

I use Gmail to exchange confidential and important documents with my customers. The documents are read by an unauthorized person (during sending the email) that I don't know him/her. How can I solve ...
0
votes
1answer
135 views

Metadata-free Email: How can SENDER directly, anonymously, and securely ask RECIPIENT’s mail provider to deliver a metadata-free email?

If I want to send emails to friends who use Google, Yahoo, AOL, etc., how can I currently use my local email client to send a metadata-free* email to them? E.g., is it possible to bypass my own mail ...
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2answers
57 views

Associate guest orders with account if email matches?

A web shop allows orders from guests. When checking out, the guest has to provide an email address (in addition to shipping address and payment data). When this email address is already in use by a ...
1
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1answer
56 views

Getting more users to use PGP [closed]

Does anyone know of browser Plugins that make Composing, sending, and reading email basically effortless? Mailvelope doesn't seem to be working with the floating compose boxes in Gmail currently. ...
0
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1answer
57 views

Certificate for Email Encryption and signing

I don't understand the flow of Digital Certificate with Email Encryption and Signing. For Example, There is 2 users, Sender A and Receiver B. Is Certificate required to encryption to A or just ...
1
vote
1answer
358 views

How could someone create a Facebook account with my email address without stealing it?

Someone with the same name as my sister seems to have inadvertently created a Facebook account with her email address. The funny thing is that this person doesn't seem to have ever accessed my ...
0
votes
1answer
244 views

What are the realistic chances of email being intercepted via SMTP/TCP-IP? [closed]

Dear SMTP and TCP/IP network security gurus: I'm curious about what is the realistic risk of sensitive information (such as a email pdf attachment) being intercepted/read by a hostile party from a ...
3
votes
3answers
305 views

Backup personal email on VPS - privacy, security and trust risks

FastMail.fm hosts my personal email account. Now they claim to have reliable backup services, but I'd like to have my own copy of my email archives. What I'd like to do is back up to my VPS, which ...
2
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1answer
72 views

Layered email encryption with multiple private keys on separate media

I'd like to encrypt e-mail messages so that multiple physically separated keys are needed to decrypt them. For example, I'd like to have three private keys stored on different media, as in: key A ...
3
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2answers
289 views

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?
0
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1answer
233 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?
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1answer
58 views

Do corrupted pdfs become a virus?

Can someone let me know if a corrupted pdf if the binary for a virus still exists but the pdf structure is corrupted does it still become a virus when downloaded form email?
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3answers
146 views

S/MIME doesn't protect against a stolen password, right?

We're setting up S/MIME so that we can send encrypted emails. However, I have a bit of a stupid (and maybe obvious) question... If someone steals a password for either the sender or the receiver, ...
1
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1answer
65 views

Storing opened mail attachments unencrypted in /tmp is a normal thing?

So there is an E-mail client. I can encrypt its database with a few clicks in its menu. But it's storing the opened attachments unencrypted in /tmp/foo/bla.xls. The bla.xls has 644 UNIX permission ...
2
votes
0answers
49 views

Creating New Acc in Mac Mail 1st Connect to Server not SSL is uname & pw tx secure?

It appears that whenever you set up a new mail account on Mac Mail on OS X (or iPhone, iPad etc), that as soon as you enter the server and the mail account user name and password, Mac Apple-Mail tries ...
0
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1answer
132 views

Email hacker, what to do now?

Throughout the past 2 years; I have received email messages (about 6 or 7 cumulative) in which I responded to about 3. Which were personalized messages from a series of 3 email addresses. Nothing ...
2
votes
2answers
200 views

GPG good signature but Warning: untrusted signature

I'm having an issue with some of my clients being unable to open email attachments when I sign the messages. The error they get is something like (free translation): Error: cannot open. The ...
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2answers
74 views

encrypted emails and keyservers

I read that encrypted emails are secure, cause only who has your public key can decrypt it. I also read that it's a common thing to upload your public key on a keyserver. But if my encrypted email ...
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2answers
158 views

What was the Lavabit's backdoors to their customers' e-mails? [closed]

There has been some talk about the Lavabit's case. New info was published today, but not important. I'd like to know how Lavabit worked. First I thought they just did something with OpenPGP. Then I ...
3
votes
1answer
231 views

3000 new contacts being added to gmail after receiving an email

Recently I realized that there are three thousand contacts with same name and email address in my Google contacts. The name belongs to an email that I have recently received and responded to, nothing ...
38
votes
10answers
2k views

Cryptography that looks like ordinary email

I would like to stay out of the automatic filters in place by security agencies and not be accidentally placed on a no-fly list or such. Say I'm having a political debate with a friend about democracy ...
51
votes
4answers
2k 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 ...
0
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1answer
148 views

Invalid Certificate when adding Gmail account to Apple Mail

Trouble seemed to start after upgrading to OS X 10.9. I stopped receiving email in an account I'd set up over a year ago. I removed the account and when I attempted to add it again, I was served a ...
22
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3answers
2k views

What does the email header-line “message opened by mailclient” mean?

Today a Belgian MP claimed (backed up by a security expert) that her email headers show that her email was read during routing (text in Dutch). The published screenshot of the headers highlights the ...
0
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1answer
136 views

How do I determine S/MIME encryption used?

From what I understand it seems that S/MIME uses PKCS #7 which can handle various different types of encryption. How is the choice of encryption method made by the e-mail client and how do I know what ...
10
votes
3answers
710 views

Can we make sure that the new Lavabit certificate is not under control of the FBI?

After the Lavabit shutdown, Ladar Levison (founder of Lavabit) announced that he’s "looking into setting up a site where users can download their data". Such a site is now online: ...
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2answers
409 views

Scan password protected email attachments for malware

We have an email policy that prevents email from going through if it has password protected archive files attached. This is to protect users from viruses and trojans because the contents of the ...
0
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1answer
872 views

How to secure my network, laptop, ipad and email accounts which are possibly hacked?

Background Last month I noticed lots of failed emails in my inbox and after few minutes I lost my access to my Yahoo Mail. My friends informed me that they have received spam emails from me. So I ...
4
votes
5answers
565 views

Alternatives to sending out passwords in plain text via e-mail?

One of my hosting providers is sending a new password in plain text per e-mail, on request. How insecure is this practice? What would be a good (more secure) alternative to this?
1
vote
1answer
249 views

Why are the first 16 bits of the message digest not encrypted in PGP? [closed]

The first 16 bits of the message digest in a PGP signature are translated in the clear. As we know, sending something in clear text does not sound like a very good idea from a security point of view. ...
1
vote
1answer
560 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 ...
0
votes
1answer
77 views

Would this form of more seamless e-mail confirmation be secure?

When you ned to confirm that an email address belongs to a certain visitor to your site, would it be insecure to do it as follows: When the user visits your site, you give them a session token as a ...
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votes
1answer
63 views

What are the security features of the proposed “secure email” from Brazil? [closed]

Brazil has announced that they will create a secure email alternative in light of NSA spy programs. The company Correios will be implementing the contract over the next year or so. What are the ...
2
votes
5answers
518 views

How can a non-technical user verify a message was sent “securely”? …or over TLS?

I have a situation where B2B and B2C communication needs to be sent securely and not visible to most SMTP hijackers. I don't care about conspiracy theories or NSA style attacks, but want to provide ...
1
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2answers
200 views

Email spam targeted at a pair of users

Two users on my domain are receiving spam emails that have both of their emails in either the To: and/or CC: fields. There are many other users on the domain, but only these two are receiving spam ...