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

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11
votes
4answers
16k 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).
3
votes
1answer
79 views

How to de-obfuscate a malicious payload?

I've received some spam email that led to a JavaScript file which I assume is malicious. My curiosity got the best of me so I opened the file in notepad and I'm trying to make sense of the code but I ...
3
votes
1answer
28 views

Is using PGP/MIME or PGP Inline more secure?

Using Enigmail for Thunderbird, the setup wizard automatically sets itself to PGP/MIME and also disables HTML formatting. I am looking for security and have no idea which to use, though I do know HTML ...
0
votes
1answer
756 views

Security implications for email address and url changes?

recently, we are seeing some From:, To:, Cc: addresses being rewritten from user1@companyA.com to: https://3c-lxa.mail.com/mail/client/mail/mailto;jsessionid=36725F1B090973DAF815646A3B096862-n1....
1
vote
1answer
37 views

Would the following practice make email PCI compliant?

If a system applied to the following three practice/technologies to each e-mail, would it rate as PCI compliant? The email itself is encrypted Encryption is applied end-to-end in the transport layer ...
0
votes
0answers
56 views

Why can I login in my Facebook account with an email not the main one? [on hold]

My Facebook account was registered with a Hotmail e-mail. My secondary e-mail is an ISP e-mail. Since I remember I never had other secondary e-mail added. However today, in my laptop, I inadvertently ...
0
votes
2answers
71 views

How am I being scammed?

I have received an email, claiming to be from Microsoft. Here is a snapshot of it: Google marked this email as spam with the following notice: These are some header details: Now, the text of ...
3
votes
6answers
26k views

Possible ways to track down anonymous mail senders?

In my previous post here How can I send emails anonymously? the community framed and guided how we can send an anonymous emails through various ways which makes me thought about the following things ...
6
votes
1answer
170 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, etc)...
1
vote
1answer
35 views

Hops encountered More for spam Mails than Legitimate Mails

Background I am working with email headers for spam detection. Each E-Mail header contains many "Received:" headers fields. Each "Received:" header is added by an intermediate Smtp/Mail server in the ...
-1
votes
2answers
794 views

How to minimize your fingerprint, or become invisible on the web? [duplicate]

With all of these news stories about the government reading emails and snooping information from other sources, what are ways to minimize or eliminate an organization's ability to actually track and ...
8
votes
2answers
2k views

Do any Exchange hardening guidelines recommend disabling OWA Webready? Should they?

For the fourth time in over a year, Exchange OWA has put our internal network at risk due to a remote code execution flaw that exists on the server runtime. This risk is compounded by the fact ...
1
vote
2answers
325 views

Received an email about an “Etsy” Password Reset due to the “Linkedin Breach…” is this a phishing attempt?

I received an email today from Etsy saying they are resetting my password(from the source it looks like a mass reset of all users), due to there being some sort of Linkedin breach, that compromised ...
-1
votes
0answers
28 views

Preventing denial of email (Gmail)

Case 1: The attacker is or has access to MITM the ISP(3g/2g). The ISP also happens to be the GSM company. This could be because of police supervision. He is forced to use computer with a backdoor. ...
-1
votes
0answers
26 views

s/mime edit an existing certificate

We are using an encryption appliance that is capable of creating S/MIME certificates for internal users. The appliance is synchronizing with AD to get the user. When the certificate is created it will ...
4
votes
1answer
74 views

Getting subscribers on website from nowhere?

I have a weird question and I hope I am asking in the right place. Recently I checked some statistics on my website after a while and noticed that the number of email subscribers had jumped from about ...
0
votes
1answer
29 views

Google mail - Paypal emails going directly to trash [closed]

Emails coming from paypal go directly to my trash, I noticed this today because i got a mail notification through OSx. However when i went to find the email it wasn't there. After some digging i ...
0
votes
1answer
60 views

How should I handle a spam account I don't control from sending spam emails with my username?

A family member contacted me yesterday saying their email has been hacked and that some other family members received spam emails from their account. For this example, lets say the hacked family ...
2
votes
1answer
58 views

Identify if a certain domain is using Office 365 or Google Mail

I have a list of e-mail domains that i wanted to confirm if they're using Office 365 or Google Mail for mail. Checking MX using Nslookup can do the job but I noted that a few companies will use an ...
17
votes
2answers
4k views

Does my PGP key really need to match the e-mail address for which I'll be using it?

In considering whether or not I want to join the big web o' trust and put my keys on a key server, I got to thinking about how it would affect my e-mail address' exposure. I generally try to keep my ...
1
vote
1answer
80 views

What's the minimal way of sharing your public PGP key in email signature?

What's the minimal (not the entire public key) and secure enough way of sharing your PGP key in an email signature?
1
vote
0answers
19 views

What do I need to do in order to use Enigmail on more than one PC? [migrated]

I've already imported my keys from pc1 to pc2, but on pc2 I always get this error message: Error - no matching private/secret key found to decrypt message; click on 'Details' button for more ...
3
votes
1answer
196 views

How safe is it to use shared SPF record domains?

I'm wondering the following, what if shared SPF records like below are used? v=spf1 include:_spf.google.com ~all v=spf1 include:spf.mandrillapp.com ~all v=spf1 include:servers.mcsv.net ~all Can it ...
11
votes
5answers
2k views

Hashcash, is this really used?

I just heard about this term, is it really used? The concept does not seem new, is it used and/or implemented in current technologies?
42
votes
5answers
6k views

Why is end-to-end encryption still not default in mails?

I am not a cryptographer. Maybe that is why I don't see the issues with integrating PGP into SMTP. In my head: Lea requests the server of Luke's domain jedi.com to tell her the public key of luke@...
3
votes
1answer
83 views

Can email services upload files from your computer without your permission/knowledge?

The company I work for is involved in security clearance work, and thus all company computers are monitored (files, screenshots, etc). I am routinely logged onto my company email service with my ...
0
votes
1answer
28 views

relationship between anti-spam solutions and whois databases

Are there anti-spam SMTP proxies(like ASSP, qpsmtpd) or e-mail spam filtering solutions in general(like SpamAssassin) out there which create for example block filters based on objects in RIR databases?...
0
votes
1answer
424 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
74 views

Can an email header can be used to verify the real sender? How?

Lets say you're the target an advanced phishing attack, meant to look like it came from Amazon.com. It shows @amazon.com in the sender field, but you're suspicious. You can call Amazon and find out, ...
3
votes
1answer
57 views

Login based on mail domain

I'm trying to make a system where the sign up would be allowed or denied based on the domain of the mail. So let's suppose that only people from company.com are allowed to sign up on that system. ...
16
votes
3answers
596 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
votes
0answers
30 views

How to record the event that an attachment from Outlook has been clicked to run or downloaded to the disk? [migrated]

I am developing a solution to monitor security events on Windows. Two of the events to monitor are: an attachment from an email (Outlook) has been clicked to run or downloaded to the disk a link ...
3
votes
2answers
104 views

Confirming an email address with a link

During an onboarding process, I want to confirm a user's email address by sending him a link in the form of a URL followed by a GUID as the parameter: www.somedomain.com?p=GUID What sort of security ...
0
votes
1answer
142 views

Is it safe to be showing my WAN and LAN IPs in my email headers?

I don't know how to hide my LAN IP from my email recipients. My LAN IP shows up next to my WAN IP in my outgoing email headers (sent to my other accounts and viewed by me). I have not seen emails sent ...
0
votes
2answers
61 views

How does an email provider verify my custom domain name?

I'm new to this and I've read a tutorial on this page: http://www.melyssagriffin.com/use-gmail-custom-domain/ The author of the tutorial wrote about her experiences of setting up a custom domain name ...
0
votes
0answers
16 views

SPF block on return-path mail [migrated]

We make use of a unique return-path email on all email sent to track bounce backs and give feedback, but recently we're getting issues where the SPF record fails because people are allowed to send ...
0
votes
2answers
20 views

Reconcile IMAP4 RFC with No RC4 RFC

RFC 3501 states: IMAP client and server implementations MUST implement the TLS_RSA_WITH_RC4_128_MD5. RFC 7465 states: o TLS clients MUST NOT include RC4 cipher suites in the ClientHello ...
-3
votes
1answer
65 views

Spam email sent to my contacts pretending to be me.

I just found out someone has been sending spam emails to my contacts. I first thought that my account was hacked, but the emails aren't coming from my account but from a weird email address (my name ...
14
votes
15answers
692 views

Sending password reset links in email

Nowadays, when everyone tries to be more secure then each other, when companies spend billions on information security, it seems a little bit odd that the password reset left behind, the place that, ...
2
votes
1answer
50 views

OpenVPN Client Id appearing in emails

I use OpenVPN to connect to a server. I just found that in a series of emails I sent and received to and from the same person the following line appeared after every message I sent: [cid:{a long ...
0
votes
0answers
20 views

Spam mail header Analysis [migrated]

I have downloaded spam dataset ,as i am working on spam detection. Below is a snapshot of Email header received. Received: from localhost (localhost [127.0.0.1]) by phobos.labs.netnoteinc.com (...
1
vote
1answer
53 views

Does putting in quarentine attachments with two dots increase security in Outlook 2010?

Outlook 2010 and antispam systems already forbid executable attachments. In this scenario, does putting attachments with two dots in quarentine increase security? Attackers used to use this technique ...
0
votes
3answers
438 views

Email from supposedly Apple (mycloud.ssl.com)

I got an email where it says that Apple recently failed to validate my payment information and therefore they need to ask me to complete a short verification process in order to verify my account. At ...
3
votes
1answer
545 views

Where do I report a friend's email account that has been hacked?

I just received an email from a friend's email account that conforms with the standard hoax where the person says they are traveling, have been robbed, and need money to pay for the hotel bill to get ...
206
votes
15answers
10k views

Tracing the location of a mobile IP from an email

I'm a TV scriptwriter - and not hugely tech-savvy, so please bear with me... If the police have an email, sent by a suspect over a 3G or 4G network, could they use the IP address (since they know ...
3
votes
3answers
188 views

Sending sensitive infromation via self destructing link in an email

I need to come up with a simple way for people within the company to send out arbitrary sensitive information to arbitrary recipients. There is an equal chance that the sender and recipient will be ...
0
votes
0answers
34 views

Certificate not showing up for signing in Outlook

I have a new ECA certificate installed on my Windows 7 machine, but when I use Outlook it is not letting me change the signing certificate to the new certificate, but it does let me change the ...
14
votes
2answers
16k views

Is it possible to use S/MIME in the web client of Gmail?

I could not find any options in the web interface of Gmail. All I could find was a Firefox plugin to use S/MIME with Gmail, but it seems to be outdated.
2
votes
2answers
218 views

How to tell if an email is encrypted, or just corrupted?

Ran a recovery program (Kroll Ontrack) on a Windows 7 PC and recovered many, many emails. Almost all of them open in my Windows 10 mail client (and Thunderbird), except for a handful from this March. ...