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

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Email security and Home Mail Servers

Suppose you're truly paranoid (I assume the majority here identify with this?) and you don't want Google or other email service providers reading your email (to serve ads, etc). You don't want your ...
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5answers
203 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:// ...
6
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4answers
5k views

Can most mail from *.ru be considered spam?

Is it safe to assume that most, if not all, emails from a *.ru domain may be considered spam? From a log of 30000 emails from *.ru, its all been spam (over two months).
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2answers
149 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
46 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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4answers
7k views

Email headers from messages sent via Gmail online client contain private IP addresses. What are these addresses?

Someone has sent a sensitive email from my Gmail account. I wanted to trace the IP address by checking out the Received: by X field in the header of the sent message. However, every message that is ...
4
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2answers
154 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
101 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 ...
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5answers
61k views

How to find out the IP address of email sender in Gmail

Gmail doesn't give the IP address of the sender in its mail headers for security reasons. I'd like to know whether there is some other way of getting the IP address of the sender. Since Gmail ...
4
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2answers
188 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
96 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 ...
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3answers
171 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, ...
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1answer
65 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 ...
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2answers
303 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 ...
0
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1answer
71 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 ...
3
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2answers
395 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?
2
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2answers
361 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: ...
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2answers
293 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 ...
10
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3answers
608 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 ...
3
votes
6answers
208 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 ...
3
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3answers
364 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 ...
5
votes
6answers
14k views

Is update@em.facebookmail.com legitimate?

I'm having a hard time figuring out whether this email a friend of mine got is legit or a scam. The weird thing is there's only one link to facebook.com, which is the one about facebook terms. All the ...
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2answers
105 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 ...
2
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1answer
82 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 ...
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2answers
62 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 ...
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1answer
83 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
64 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 ...
0
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1answer
639 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 ...
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2answers
76 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 ...
7
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2answers
2k views

secure webmail provider

Which email providers (e.g. Gmail, Yahoo, etc) offer the most robust security for a personal email account? The recent article about Mat Honan getting hacked illustrates the challenge. The account ...
0
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1answer
443 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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5answers
629 views

How can I prevent forwarding a manipulated email?

How can I prevent someone from modifying the contents of an email they received and then forwarding it to others? Some employees cheat managers by changing the content of emails and forwarding the ...
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1answer
62 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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1answer
69 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 ...
11
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3answers
9k views

Is a password protected PDF file safe for bank statement attachments?

My bank emails my monthly statement to me in a password protected PDF attachment. Is this a secure method of transmitting something as sensitive as bank statement?
2
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0answers
59 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 ...
51
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4answers
3k 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 ...
20
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4answers
1k 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 ...
0
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1answer
143 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 ...
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4answers
5k views

How to trace email?

Is there any tool to trace all emails? I need to trace ip address and location of sender address.I also need to identify emails from fake address.
2
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2answers
308 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
177 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 ...
0
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1answer
777 views

What are the ports used by Online Email Accounts such as Yahoo Mail, Gmail, etc.?

Let us say that I send an email using Yahoo Mail or GMail. Can this email be intercepted using a packet sniffer? On which port does the email travel? HTTP, SMTP, POP3?
8
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3answers
673 views

Is off-the-record style encryption possible with email?

The instant messaging world has off-the-record encryption - which means you get authentication, encryption, and forward deniability. Key material is published after a session ends such that an ...
0
votes
2answers
482 views

Issues with using a mail server that doesn't support authentication to send mail?

I have noticed the mail server we use at work (provided by our web-host) doesn't require any authentication to send mail through. I understand you easily spoof sender address' in emails, but I'm ...
6
votes
4answers
2k views

Reporting a GMail hacker attack

This morning I found 17 e-mails in my GMail outbox that I didn't send. The e-mails were sent to seemingly random people from my GMail contacts and contained the link to a suspicious php file on ...
4
votes
1answer
77 views

Securing an IMAP service

I need to secure an IMAP service running on dovecot. Which wrapping layers of security can I enhance security with? I am using most of the built-in dovecot-specific security features, like ...
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vote
2answers
480 views

Is spam more likely to be sent to info@example.com? Would I be better off using a different address?

I think that when bots gather domain names or process a list of domain names, they create email addresses like info@example.com or support@example.com. Does selecting something different help to ...
0
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1answer
179 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 ...
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1answer
751 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 ...