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

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3
votes
2answers
809 views

PayPal “Confirm your email address” spam emails? I got 3 different mails within 10 hours

I got 2 emails within 12 hours containing the following: Confirm your email address Hello [Name] [Name], Confirm your email address now to let us know it really belongs to you. Once ...
4
votes
1answer
62 views

Implemented DMARC, getting reports of canonical.com sending spam - has Ubuntuone been hacked?

I have implemented DMARC on my mailserver and for the first time I'm getting reports of an IP address trying to fake me as the email sender: >record> >row> >source_ip>91.189.90.7>/source_ip> ...
-1
votes
3answers
110 views

Are 21 characters enough to restore a PGP key?

The german e-mail hoster web.de offers PGP encryption with Mailvelope now. To transfer your private key to another browser, you can use a 21 characters long recover key. How does this affect the ...
0
votes
1answer
62 views

Does a 'mailto:' hyperlink spoil any preceding email obfuscation efforts in PDF?

Assume there is a PDF file which contains the example@example.com email address as an image (the classic obfuscation method). However, what if this image is made clickable with a hyperlink which ...
3
votes
2answers
140 views

activate user account through email

I see a lot of people say to hash for the token on email verification when dealing with member registration. I am wondering, if the email token is only to activate the account and nothing else, ...
3
votes
2answers
90 views

Email security on a Windows phone

Let's say I set up a Microsoft account on a Windows phone and use the associated built in email client. If I send an email, would it be send in plaintext. On wifi, if someone is sniffing the traffic, ...
0
votes
1answer
64 views

How much information, at maximum, can a phisher/scammer obtain?

My iPhone was recently stolen and since then I've been receiving messages and emails saying that 'a sound was played on your iPhone' or 'your iPhone was found. Visit here to confirm your location'. ...
26
votes
6answers
15k views

How do I safely inspect a suspicious email attachment?

I received a pretty blatantly spammy email to my Gmail account. I'm not really sure how it made it through the spam filters, since it has all of the telltale signs. The FROM field is spoofed as ...
6
votes
1answer
1k views

How to reject e-mails spoofing your own domain targeting your employees at Office365?

One problem Office365 users deal with is that an external SMTP server can spoof the domain of an organization and send e-mails to the domain users; where the e-mails appear to be from employees of the ...
6
votes
2answers
2k views

How is ZixCorp able to provide email encryption without a password?

I am trying to understand how/if an email I received is being encrypted. A financial institution sent me a verifiable email (i.e. not phising) asking me to fill out a pdf form to complete a ...
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
102 views

How to prevent phishing mails from being successful? [duplicate]

I'd like to know what the best methods are to prevent success of phising mails. This question contains the following subquestions: What are the best ways to determine incoming phising mails (on a ...
-3
votes
1answer
106 views

How to sell a new idea – “100% secure communication”, feedback wanted [closed]

I have thought of an idea (new product) to have 100% secure communication between 2 parties and would like your feedback/ideas on how to sell it. Oh, before you start that there is no such thing as ...
2
votes
1answer
164 views

E-Mail made in Germany. Better than traditional ones like Google or Yahoo? [closed]

A friend of my mine who lives in Germany called my attention to a so called "E-Mail made in Germany" (EMiG). Since the country is well known for exporting high quality products, I decided to take a ...
5
votes
2answers
122 views

Should I be worried if somebody uses my email to sign up for accounts?

I recently received e-mails from two services: Paytm and Uber. They both seem like legitimate services. However I have no idea why I received these e-mails or why somebody would want to create an ...
58
votes
6answers
14k views

Is gmail-to-gmail still insecure? Why?

I have always heard that email is an insecure method of communication; I assume this has something to do with the email protocol itself. But when sending an email from one gmail account to another, ...
8
votes
3answers
1k views

Can my ISP read my gmail even when using HTTPS? Is there a way to prevent that?

Can my ISP read my gmail or other email even when using HTTPS? I guess they can do that since they are the "man-in-the-middle". Is there a way to prevent that? This is related to the news that in ...
-2
votes
1answer
106 views

Self-Destructing Emails [duplicate]

So I just recently started reading into Self-Destructing emails trying to learn how they work but I am unable to find much relevant, technical information. I'd like to know exactly how this works ...
2
votes
1answer
269 views

Reasons why there are no web based unified email clients (with OAuth2)?

There are plenty of mobile applications that you sign into with different accounts to retrieve email, contacts, and calendar (such as CloudMagic), and a couple desktop clients (such as Inky). Yet I ...
1
vote
0answers
241 views

USA PATRIOT Act and Office 365

I have a local Exchange server, which has several spam and email reception issues (Due to an expired subscription to a spam filtering system). I was looking at the Office 365 Exchange Online ...
3
votes
2answers
192 views

Is it appropriate to block a sender's email address

This morning I received a mail from Apple suspension UK <do_not_reply@apple.co.uk> with the subject Apple "Unauthorised transaction alert". The mail was sent to one of my company's distribution ...
3
votes
1answer
82 views

Is it a bad idea to forward a suspicious email with an attachment - even to a secure address for analysis?

The more servers the message passes through the more potential of the attack to execute successfully? (0-day etc). Or is this paranoia? Instead: Delete, disconnect from network, and phone security ...
4
votes
3answers
223 views

Would trolling the people behind scams help decrease scamming? [closed]

It is easy for smart people to identify scams. This isn't an accident, phishers want stupid people. Sending the emails is the easy part, getting their money is what takes effort. My question is, ...
13
votes
3answers
917 views

Why is encryption (or signing) of long lines in E-Mails with PGP problematic?

I am using Thunderbird with Enigmail and OpenPGP to encrypt and/or sign E-Mails. On many occasions Enigmail complains that I have too long lines in the mail and asks how it should wrap them. However ...
4
votes
1answer
120 views

Passive fingerprinting of email client, based on email headers

Are there ways to passively fingerprint (infer) the operating system or mail client that an email sender is using, based upon the headers of an email from that sender? I'm familiar with passive ...
64
votes
2answers
10k views

What is the purpose of these weird non-spam emails?

A mail made it through the spam filter and i wonder what the purpose is. It is not spam. Tracking? But how? Who? and why? In the source code there are this weird passages like ... =EA=85=9F ...
0
votes
2answers
107 views

LAMP MailServer without SSL… so what's the problem?

I want to set up a MailServer on Ubuntu for my website, and access the email from my POP3 client without enabling SSL encryption (I suppose the SSL is used to encrypt the password?). My questions ...
5
votes
5answers
10k views

How commonly are SSL/TLS or S/MIME used by e-mail providers?

I was reading through different posts here about email security. After reading these I still have some questions. I understand that S/MIME can be used to transfer email securely between servers. ...
71
votes
8answers
8k views

Unsubscribe safely

I have heard that is better to never click to any link in an email. Is it a bad idea to click to a unsubscribe link? What is the best way to unsubscribe to undesired mails?
26
votes
3answers
4k views

How can people send me spam emails from the future?

Is this an exploit of the email system of some sort? I receive a great deal of spam every day, and my accounts in Yahoo and Gmail sometimes show me spam emails from the future. Yes, the future. ...
4
votes
4answers
402 views

Safe way to communicate IBAN connection

How do I securely communicate my bank connection details (IBAN + full name) to an otherwise trusted person with email being the only connection? Obviously I wouldn't use (plaintext) e-mail since any ...
2
votes
0answers
38 views

How should end users respond to Earthlink's “Allowed Sender” feature when blocked by policy?

Some of our users are requested to click on an Earthlink antispam URL below https://webmail.pas.earthlink.net/wam/addme?a=USERNAME@earthlink.net&id=<SOME GUID> However our firewall ...
4
votes
3answers
638 views

Using + for email addresses to find out who is selling your data: is it naive or is it effective?

It's pretty common among security-minded folks to fill in addresses using e.g. foo+company@gmail.com when disclosing their email address to company so that they can tell if company has sold their ...
-2
votes
2answers
69 views

Is there any way to formally ensure privacy to my clients by technical means?

Imagine you are a software solutions company. One of the solutions you provide are domains, email and forwarding mail to their Gmail accounts. After we have created a domain and several email ...
3
votes
1answer
63 views

Multiple OpenPGP encryption keys signed by a single certificatation key?

Say I have several different email accounts and I want to use a different encryption key for each of them but still have them all certified under one identity. Is this a good idea and how would I do ...
1
vote
1answer
55 views

Resellers and web admins and email privacy

Maybe I'm missing something, but this is "my problem". If you ask some company to create some domain for you and several e-mail account with that domain and forward that information to your gmail ...
5
votes
1answer
437 views

Security of Yahoo's new authentication: On-demand password

Yahoo is trying to remove passwords from authentication and use on-demand password authentication system instead. I wonder how this new system will be secure? Even if somebody steal your mobile can ...
0
votes
1answer
569 views

How dangerous is checking email on open Wi-Fi network

How risky is it to check my email on my smartphone on an open Wi-Fi network (i.e. Starbucks or Old Navy)? Is this only risky if someone is snooping? Do they have to be there, or can they leave a ...
3
votes
1answer
51 views

Question about email app in Python and security

I've managed to get my tiny little app to send an email with a click of a button using this code (this is just the email part): http://pastebin.com/nR5g28ct But to avoid some error, I had to allow ...
2
votes
1answer
54 views

Are there any examples of when personal email data can be brought into a lawsuit involving a corporation?

If users bring their own device (BYOD) and they have corporate Exchange (or Goodlink email) on that device, could the other email accounts on that device be open to a legal search? Would the SMS ...
0
votes
0answers
121 views

How can secure email be used while avoiding government attention?

Presumably all unencrypted email is available to federal agencies including IP addresses, header information, and email content (eg, through SMTP with or without SSL and TLS -- thunderbird has an ...
1
vote
3answers
2k views

Tracing an email's MAC address

Can someone trace the MAC address of an email to the point of origin if the email address has been deleted? I received an email from an unknown sender regarding an issue at my work, and when I tried ...
-7
votes
1answer
200 views

Is Google intercepting my emails? [closed]

I was recently checking my Recent Activity under the "Details" tab inside my Gmail inbox, and I noticed this IP Address, it's not my IP: I proceeded to look up the IP and it's located in Mountain ...
6
votes
2answers
745 views

Passwordless login over email - security considerations

I'm proposing the use of a login system that sends a one-time login token (with high entropy) via email to the user. After using the token, the user receives another token via email and the previous ...
4
votes
1answer
109 views

How accurate the recent activities location provided by Microsoft emails

One of my emails is on hotmail.com provided by Microsoft. Recently, after few suspicious incidents where my computer was hacked and many other accounts, I changed all my passwords including this ...
32
votes
2answers
3k views

Is email less secure than voicemail, snail mail, or internet portals for transferring sensitive information?

Where I am in the US, health care providers refuse to send anything through email (e.g. even something as trivial as an appointment reminder). Often they claim that email is not secure. Instead they ...
4
votes
3answers
253 views

How do I recover from an email breach?

A few days ago, I noticed something a little bit off from my Gmail account, my primary account, which all my addresses forward to, was showing less incoming email. Usually I have roughly 6-10 emails ...
-1
votes
1answer
81 views

indicators of compromise via email servers

Malicious files are commonly infiltrated on to the network via email attachments. Besides awareness and education to my staff to refrain from clicking on suspicious attachments, I would also like to ...
5
votes
1answer
266 views

Is my ISP trying to impersonate google?

Everything has been well for years and today I wake up with this: A warning on EM Client (also got the same on my iPhone) that the certificate for googleapis.com isn't valid. And the certificate ...
8
votes
2answers
6k views

How to prove my Gmail has been hacked?

I believed that someone had hacked my Gmail because they were using information contained within my emails in an attempt to try to convince me that they were psychic. I told them that I didn't believe ...