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

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16
votes
2answers
2k 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 ...
7
votes
2answers
451 views

ProtonMail security concerns

This TED talk brought me here. First of all, to those who created ProtonMail: Nice job!!. Regardless of what people say, it's definitely a big step forward from tradition options like Hotmail, Gmail ...
0
votes
0answers
7 views

SPF - Will softfail get inherited when included? [migrated]

If I add the SPF-policy v=spf1 include:_spf.google.com -all to my domain, will the -all have some effect or will the ~all from _spf.google.com get "inherited" to my domain?
3
votes
2answers
134 views

Yahoo mail hacked - how to recover, how did it happen and how to prevent?

I was yesterday informed by some friends that they received spam mails with my name as sender. The sender addresses look like firstnamelastname@spacepc.pt and firstnamelastname@revistaplot.com with ...
1
vote
0answers
16 views

Mod Security - How can I email alerts from logs for incident response? [on hold]

We are in a production environment and I have mod_security WAF storing logs in /var/log/foo.log . We are wanting to have alerts that we have fine tuned , upon being logged to be sent to us via email ...
1
vote
2answers
77 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 ...
3
votes
5answers
8k 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. ...
66
votes
8answers
7k 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?
25
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
215 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 ...
10
votes
2answers
10k 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.
1
vote
0answers
26 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
343 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
47 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 ...
7
votes
2answers
669 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
26 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
49 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 ...
4
votes
1answer
213 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
113 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
28 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
42 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
78 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 ...
2
votes
3answers
96 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 ...
-1
votes
0answers
6 views

Allow email client to send and receive data through modem-router firewall [migrated]

I'm working to allow my email client (Thunderbird) to send and receive data from remote servers, but when my modem-router firewall is turned on it doesn't work. As a result, I must setup a custom ...
-5
votes
1answer
114 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 ...
4
votes
2answers
453 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 ...
0
votes
2answers
115 views

What stopping someone from offering distributed and encrypted email? Just like Bitcoins

Basically Email service that is ran over a network, so it's not owned by any one entity. Everyone can use it and send email to someone else. All messages travel through a web of interconnected ...
4
votes
1answer
40 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 ...
3
votes
1answer
65 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, ...
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
207 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
36 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 ...
2
votes
1answer
102 views

Reading encrypted data before sent to remote server

I'm developing a mobile app (Android only for now) to provide a disposable e-mail service to users. Users will be given temporary e-mail addresses so they can receive and read e-mails for a certain ...
5
votes
1answer
242 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
4k 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 ...
0
votes
1answer
22 views

Under what circumstance might your email not make to your intended recipient? [closed]

I'm asking because it's one thing to eavesdrop on someone's email, but it's another thing to prevent your email from getting to your recipient. For example, I sent an email to a colleague and he and I ...
3
votes
3answers
97 views

Any Security Risks for using mailto:?

I use a PHP script which performs a database search and when no result are found, user is presented with a mailto link with this format mailto:example@test.com?subject=SEARCHED_QUERY_HERE The ...
10
votes
3answers
10k views

How does someone with HubSpot Sidekick knows when I opened their sent email?

This app claims to know when recipients opened the emails that were sent to them. Tracking clicked URLs is fairly straightforward. What I don't understand is how a 3rd party can possibly know when I ...
3
votes
3answers
81 views

Email injection in simple terms?

Can someone explain why spammers use email injection? I am a victim and was wondering if there was any other malicious point besides annoying me and filling up my e-mail?
21
votes
4answers
21k views

Is it possible to easily retrieve Thunderbird's passwords with access to HDD?

I know Firefox 8 stores it's passwords in a SQLite database, which can easily be stolen with access to the HDD! What about Thunderbird 8? How does it store the passwords and how can one retieve them? ...
0
votes
0answers
91 views

Why is my website getting spammed?

Does anyone recognize this type of spam? NAME: Bagas EMAIL: dq95zxm7l@gmail.com PHONE: JCBUIR6ulwtO COMMENTS: I must express apaotcipeirn to the writer for bailing me out of this particular ...
3
votes
2answers
56 views

DMZ and mail servers

I've seen a few DMZ related questions here in the past, but wanted to ask one directly related to email. I've done some research on this, but wanted to ask the forums opinion. I know it's best ...
47
votes
6answers
8k views

Why do security experts like Snowden use email services like Lavabit and Hushmail rather than self-hosted email?

Why would anyone like Edward Snowden rely on 3rd party services like Lavabit or Hushmail to host his email? I mean it's very easy to set up a self-hosted email server. What you need: Rent VPS (even ...
10
votes
5answers
13k views

Can the recipient of my emails know my IP address?

When I send out emails using gmail, is my IP address being recorded? can the recipient of my gmail message knows my IP address and thus infer where I am located?
3
votes
1answer
111 views

How was my email intercepted? [closed]

I've recently sent an email to a non-Protonmail user, using a code phrase. Someone on the recipient's home network was able to intercept the email and responded to me in detail as to the content of my ...
4
votes
2answers
99 views

Reset links in password expiration emails

Our organization is rolling out yearly password expiration to our 40,000+ users this fall and we have been socializing this change for some time now. However being such a large organization, our users ...
3
votes
1answer
39 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 ...
-6
votes
2answers
78 views

Is it possible that the person I write to will see the email before I write to him?

Is it possible that the person I write to will see the email's content before I reply to him? If I got an email and I answering that email, is there any feature that can cause my reply to be seen by ...
1
vote
4answers
103 views

is it easier to eavesdrop on ethernet connection rather than wifi?

I heard someone say that ethernet connection is vulerable if someone can connect to your LAN, and that the traffic isn't encrypted in the way it might be if you're using WPA wifi encryption. Is this ...
1
vote
1answer
66 views

Is thread's auto-login from email implementation secure/good user experience?

As far as I can tell thread.com log their users in automatically based on a token in their emails, appended to the URL. e.g https://www.thread.com/1234logmeintomyaccount-forexample This is a really ...