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

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2
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2answers
183 views

E-mail already in use exploit

I have a registration portal where user inputs his details and then a valid email account. Currently I check the email is not used already and if it is I reply with the classic: "email already in ...
2
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3answers
944 views

Will SHA1 of Email Addresses Always be Unique?

We want to store data about a person without storing their email address, but we want to latter connect that person with their data upon them supplying their email address. Storing a SHA1 of their ...
2
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3answers
2k views

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 ...
2
votes
4answers
148 views

The email system is compromised - what can you do?

I have a friend at a 7 person company which has an issue with email confidentiality. Each time they send out an email with quotes to customer, the competitor get the message in 30 minutes and send ...
2
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2answers
1k views

Some questions about penetration testing distribution Backtrack 5

I know just the basics of backtrack and I want to ask some questions about it: Can you attack an ftp server using backtrack? an email server? I have a Centos virtual private server and backtrack is ...
2
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2answers
141 views

Are these email captchas legitimate?

The last week, I've been getting this kind of emails to addresses that I don't use: Dear Sir, Madam, For security reasons and as part of our ongoing fight against spam, it is our policy not ...
2
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1answer
301 views

Possible Hijacked Email Server [closed]

MAILER-DAEMON notices are spamming our email administrator account, causing it to fill up, and bringing down our email server. Our email server is a Virtual FreeBSD box hosted by Verio. Their ...
2
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2answers
72 views

How to find out the email host of a vanity email address?

Assuming a person gets his own domain address, say, theperson.com. He then goes on to create a vanity email address with that domain. e.g. me@theperson.com. me@theperson.com may be hosted by the ...
2
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1answer
592 views

The security of sending emails with SPF/DKIM, but not signed

We're using an email sending service (fairly known) to send our emails. We made DNS changes so that emails going through them would pass SPF and DKIM. A few days ago we noticed that they allow any ...
2
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4answers
1k views

Yahoo Email Keeps Getting Phished

I keep getting spam emails from myself (and I am sending them to others as well) on my Yahoo Mail account. I have already went through two password changes which I thought were secure. My very last ...
2
votes
1answer
256 views

Email Compromised due to Yahoo Mail Exploit

On Monday due to XSS vulnerability present in the Yahoo mail my email has been compromised. I have immediately changed my password but i am not sure is this enough i.e. do i need to delete my cookies ...
2
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2answers
263 views

Company sending Master passwords in unencrypted emails

If a company has terrible security policies like letting people email password in cleartext emails, what to do if they reject all fair minded advice?
2
votes
1answer
44 views

Which information does a whois lookup reveal about the registrant of the domain?

A friend of mine recently got her Gmail account "hacked" because of a weak password (the same as her login..). While sanitizing her account, I removed the forwarding of her emails to one email ...
2
votes
1answer
533 views

How to determine source of e-mail and verify if the source is/could be legitimate?

I got an e-mail (in my spam folder) from usercenter@idcenter.uc.cn which asks me to click a link to validate my login for their website. Obviously, I deleted this e-mail without clicking it's link. ...
2
votes
3answers
597 views

Is it possible to block emails (to all email accounts) that contain certain word/phrase patterns?

I'm not sure if this is the most appropriate SE group to ask this question but I'm hopeful that it will get some interesting and helpful input from the folks here before it is possibly moved. A ...
2
votes
3answers
224 views

PCI Compliance Problem

My company is trying to become fully PCI Compliant and we are switching our outdated systems to use Authorize.net CIM among other things. But, currently we're all over the place and until our new ...
2
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2answers
161 views

E-mail Server Security

In recent news, Bitcoinica was compromised by an e-mail server infiltration. The hacker then applied social engineering, using one of the administrative e-mail accounts to reset the root credentials ...
2
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1answer
95 views

How can I prove to a third party that I'm sending the emails I'm supposed to?

Suppose one of my duties for a small organization is to send out statements to clients by email. Suppose one of the directors / owners / trustees want to be able to audit the numbers. Specifically he ...
2
votes
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 ...
2
votes
1answer
244 views

Why should I pay for an email S/MIME certificate?

There are quite a few SSL certificate companies out there that offer free email S/MIME certificates. There are also paid versions as well. I need about 6 email certificates for some company email ...
2
votes
1answer
180 views

Securely notify users about account changes

I am developing a web application (using PHP) and I am wondering what the best way is to notify users that someone updated their account information? The information that can be updated includes: ...
2
votes
1answer
562 views

Advice if safe from mail header injection PHP [duplicate]

Possible Duplicate: PHP mail() Header Injection Prevention Since I only started learning about header injection in the PHP mail() function, am uncertain if the form/code below is vulnerable ...
2
votes
1answer
1k views

My S/MIME certificate (created with OpenSSL) does not match my email address

I created a certificate with OpenSSL and following commands: openssl req -x509 -nodes -days 365 -subj '/C=DE/ST=state/L=city/CN=hostname' -newkey rsa:1024 -keyout mycert.pem -out mycert.pem ...
2
votes
1answer
231 views

Is the Gmail activity log still missing activesync?

Is the Gmail activity log still missing activesync as described in this blog post? As it is "someone with my credentials could be reading and sending [email] messages with my account" without that ...
2
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2answers
206 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 ...
2
votes
3answers
829 views

How to check if range of IP addresses are SPAM blacklisted?

While it's easy to check if a single IP address is blacklisted for SPAM using for example http://www.spamcop.net/bl.shtml, then is there a way to check multiple addresses at once? For example how to ...
2
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3answers
507 views

Where to get/buy a CSR generated S/MIME certificate

I'm not sure if the question is eligable for this board as I ask for concrete service providers which can be kind of advertisement, but there is also technical issue involved, so I give it a try. My ...
2
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3answers
693 views

Google Mail alert message. Hacker from China

I have had a red warning box on top of the page when I access GMail. It says that there have been three attacks from China: IP Address: 117.70.121.33 Location: Xuancheng, Anhui, China and ...
2
votes
4answers
493 views

Should links to images contained in emails be secure?

We are generating emails which contain links to images: our client's branding, images showing other products offered by the client etc... What are the security pitfalls if these links in the emails ...
2
votes
1answer
294 views

Is there any reason to not use DKIM, SPF, and SenderID because it affects plausible deniability?

Is there any basis in not deploying anti-spam (or deliverability) technologies like DKIM, SPF, and SenderID because it affects plausible deniability? Some definitions to get everyone on the same ...
2
votes
2answers
243 views

Is it unsafe to allow apps other than Outlook to send email via the Exchange server?

My application is a .NET Windows Forms client, one of whose functions is to allow the user to send personalised mailshot emails to opted-in recipients stored in the database. The emails are sent ...
2
votes
3answers
65 views

Is it a good practice to include a download URL of my GPG public key in my email signature?

I was wondering if I can put a download URL for my recipients to get my GPG public key easily in my email signature. Is this a good practice? If not, what's a good alternative?
2
votes
1answer
81 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, ...
2
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1answer
44 views

What Information is Exposed When I Send A Message From My Mobile Device

When I send a text message and/or an email, with or without location services turned on, what information is available to the recipient of that message if they know how to read the data behind the ...
2
votes
1answer
230 views

Someone keeps using my email address. What to do?

I have had a GMail ever since it was created, so it's an email address that is easy to remember, but also easy for somebody else to get confused with. Since I'm not going to post my email address ...
2
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2answers
245 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: ...
2
votes
1answer
134 views

Using X-actual-recipient to divert email

Has anyone noticed exploits involving the use of "X-Actual-Recipient" to covertly divert e-mail from an intended recipient to someone else? I have been told that only someone with root access on the ...
2
votes
4answers
224 views

Open an e-mail account from only one particular system?

Is there a way to configure e-mail so that it can only be opened from one particular system? Or from multiple systems having some sort of unique key or particular static IP?
2
votes
1answer
138 views

Encoding HTML email content

Say I have a form on my website. The input elements of the form are: email address, name and some feedback textarea. The server-side application that this form is submitted to will send an HTML ...
2
votes
1answer
588 views

Hosted Email Hacked, SQL injection maybe?

I have a hosted website using a free hosting service, I received an email this afternoon saying that I have been suspended because my account has been compromised. Basically, someone is using my ...
2
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1answer
539 views

Implementing 2-step verification via email for web apps?

I was thinking of applying 2-step verification to my web apps that will work similarly to Gmail's SMS/voice 2-step verification, except my web app will just email the verification code each time a ...
2
votes
2answers
365 views

How to investigate possible illegal access by a staff member to emails?

At work we use Outlook 2010 (I think) and an exchange server. The situation is simple: Our IT Manager (Steve) was fixing a problem one of the guys out in the field (Dave) was having with email on ...
2
votes
2answers
415 views

How secure is Goodlink for mobile phones when compared to Activesync?

Some of our more technical users are arguing to use Activesync for their phones, while the corporate standard is limited to Blackberry and any device that supports Goodlink. One argument is the ...
2
votes
1answer
50 views

Random token and email confirmation key of 10 chars sufficient?

I have a function that returns random unguessable keys with the following characters: a-z A-Z 0-9. I have set the key length to 10 and I am using that for my form tokens to prevent CRSF and I will be ...
2
votes
1answer
101 views

Fake email messages via List-Unsubscribe header

List-Unsubscribe email header makes it possible to recipient to automatically unsubscribe from the mailing list: List-Unsubscribe: <mailto:list@host.com?subject=unsubscribe&body=qwe> Free ...
2
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0answers
50 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 ...
2
votes
0answers
43 views

Is it the default in billing systems to send out the users password by email? [duplicate]

I recently made a complaint to a company about them sending out passwords in plain-text via email upon registration knowing that it is a potential security risk. One of their employees responded with ...
2
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0answers
183 views

User friendly PGP email [closed]

Does there exist cross-platform email handlers following these basic guidelines based on some very limited experience? Generate new key at first startup, rather than asking the user if they have an ...
1
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3answers
230 views

Recently received a odd email

http://photomi.co.kr/httpcnbc9home-2.com.php?subpage216 Learn How to Make Money 0nline Fast __________________ . louanne visszakuldod Sun, 22 Jul 2012 0:33:42 Is there a way to identify what ...
1
vote
2answers
376 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 ...