Questions tagged [email]

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

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84 views

We were hacked and have no idea how [closed]

Last Friday, 7 of our employees' office365 email accounts were hacked simultaneously. We saw successful logins from random US addresses. The virus went through emails and basically does a reply-all ...
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+50

How to workaround Thunderbird 78's lack of support for encrypted mailing lists?

As of Thunderbird 78, the support for PGP plugins such as Enigmail has been dropped in favour of a native implementation of pgp in Thunderbird's core. But some features of Enigmail are still missing. ...
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Strange account activity - how to investigate

Today I have observed very strange scenario which appears to be attempts to hack an account. So first, let me tell the pre-story: I have started to receive 2-factor authentication SMS messages from ...
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3answers
147 views

Can schools track what I'm doing, even though I'm on my personal Gmail account?

My school can track my browsing when I'm at home and using the Google account they gave me, the laptop is my personal one. Is there a way that they could track what I do, even though I'm on my other ...
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1answer
93 views

Is this Google mail from gaia.bounces.google.com legit?

I've received the following suspicious mail in my Gmail inbox, about my password being exposed: As you can see, it comes from gaia.bounces.google.com and is signed by accounts.google.com. But there ...
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1answer
76 views

Font risk in unopened email in inbox

This is obviously not from PayPal, but the font in the word account displayed using odd looking font, is this a security risk to me that Outlook.com displayed this font? See below, Outlook has preview ...
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1answer
30 views

Open IMAP connection using hashed password

I make email client over IMAP protocol. To "remember" user's connection details (email, password, host, etc.) I need to store password in plain text, because otherwise I won't be able to ...
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1answer
65 views

Is it safe to automatically parse text as markdown?

I have a server, which receives text mails from students and I plan to automatically collect their message bodys and parse them as markdown so that I can generate a nicely formatted output as pdf. Is ...
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1answer
96 views

How could the content of an e-mail get leaked?

My Mother received an e-mail, from some unknown mail adress. The content of the mail, was: "Hello you should look at this: ... " After this there was an old email correspondence with her ...
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1answer
61 views

How do spammers crawl the web for mail addresses?

I have recently started getting the occasional spam mail after not having this problem for several years. As far as I know spammers typically obtain mail addresses via data breaches or by crawling the ...
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2answers
77 views

Security risk for allowing accounts without captcha

I run a website that allows people to create accounts with an email address address and a password. Over the last month, I have had about 100 accounts created with email addresses that look like this:...
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1answer
99 views

Where was this email sent from?

I have done the message header lookup but the problem is that the 1st result for the from field is blank, so I would like to know can someone with a bit more experience then the basic knowledge of ...
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63 views

Are user customizable HTML e-mails secure?

Let me prefix this by saying I am aware of how HTML e-mails can implement trackers and other malicious content, however this question is quite specific. Consider a service where a company can register ...
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54 views

Handling file uploads securely in phpmailer/php

I have a lengthy HTML form with around 20-26 file uploads required and some of them are even multiple. I am really concerned about how secure it is. I would really like to have some secure solution to ...
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1answer
54 views

How many keys do you use for signing and encrypting emails? [closed]

Situation I have a university Gmail email address. I'm trying to migrate away from sending emails with the Gmail web client to one I have more control over like Thunderbird. It's also because Gmail ...
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0answers
27 views

Received email with password in the subject - To what extent have I been hacked? [duplicate]

I was cleaning out my spam folder, when I saw one with a subject line which had a little-used password of mine. 16 hours ago. I'm fairly sure odds of guessing this password are small, so I looked. The ...
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1answer
78 views

Is the IP address of the client present in the email headers for webmail services and for desktop clients?

When I receive an email sent by someone using a webmail service (e.g. Gmail, etc.), I can find the IP address of the sender's email server in the email headers. But do the email headers also contain ...
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1answer
64 views

If I leave SPF not set on my domain, is that a factor for email servers to mark emails from this domain as spam?

I wonder if the lack of an SPF DNS record is a factor in the decision to mark a message as spam. I understand that an SPF fail is definitively such a factor, i.e. when SPF is configured, but a message ...
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30 views

Can my school see what I'm doing on my phone? [duplicate]

I have multiple gmail accounts logged in to my gmail app on my phone. One of them is my school email because I like getting the notifications directly to my phone without having to log in to my ...
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1answer
92 views

Is it safe to send verification code in the subject of the email?

I am wondering if it's safe to send the signup, reset password, 6 digit verification code in the subject of the email. Example: "Welcome to the Application, Your verification code is XXXXXX" ...
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2answers
68 views

Anonymized posting mechanism for members-only-post mailing lists

Suppose you are administering a mailing list where only members/subscribers can post; but you want those members to be able to occasionally post some content to the list anonymously. (*) Now, in an ...
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4answers
8k views

Are images in the FROM name a risk in emails?

I know about images posing a risk to security. I don't open suspicious junk emails for this reason. However, occasionally I have to check my junk email folder without clicking on an email just in case ...
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1answer
104 views

It seems that someone has been trying to brute force into my hotmail (outlook) e-mail account for years now, what can I do about it?

Every time I go check my account's activity I see something very weird and worrying: multiple attempts to log in to my account, anywhere from 1 to 3 daily attempts. This has been going on for years. ...
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1answer
143 views

Is this “secure email” mechanism my bank wants me to use best practice?

So, yesterday I needed to sign & scan some forms for my bank, a credit union. Nothing hugely confidential, except it has some account numbers on it. But still, I was a bit concerned, so the ...
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1answer
80 views

Protecting against spoofed email in alias/phrase field

We have fully configured SPF, DKIM and DMARC policies (100% reject) for our email domain (e.g. spoofed.com), which is managed by gmail, but we have recently started seeing spear phishing emails with ...
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2answers
162 views

IP address leaked in email header?

Can my IP address ever be included in the header of emails I send? Or do email servers never include my IP address in my emails' headers?
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5answers
8k views

New Hires get phishing emails very quickly - Reasoning and how to stop

We hired a new Sales Ops member 1 week ago. Within a week he's getting emails similar to the below: I did some research on the sender and it is a valid email, valid person, SPF/DKIM checks come ...
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3answers
142 views

What to include in emails to make them acceptable to email servers?

I need to send some automated emails from a program I'm working on. This is a new feature. I'm generating the emails, but they get filtered by most of the email servers that I send tests to. Only one ...
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2answers
52 views

How to decide to use, then how to use an http gofile.me url in an email, explained to a five year old?

I'm terrified of clicking on links in emails, and yet a colleague insists I do. When I receive an email in my gmail account that contains links of the form http://gofile.me/xxxxx/yyyyyyyyy along with ...
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0answers
60 views

What's the purpose behind this phishing attempt? [duplicate]

As probably all of you, I got an email that was intended as a phishing attack. The HTML version of the email was pretending to be a Facebook email of a security warning. The links do lead to Facebook,...
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1answer
101 views

Register an @yahoo.de email? [closed]

Years ago I created an account and put my reset email as example@yahoo.de by mistake, it should have been @yahoo.com. Recently, I tried to access my old account but could not remember the password. ...
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0answers
20 views

How to create a “purpose-built attribute/secret” to recognize people over the phone?

Imagine you're talking to someone over the phone who needs to check something before he can call you back. In order to ensure that you will be talking to this very person later, you have to create ...
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2answers
179 views

What are the dangers of a mailto link?

I was looking through my spam folder, and there's a 100% sure spam email, that asks me to confirm that I want to unsubscribe by clicking some big unsubscribe button. That button is simply a mailto: ...
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2answers
243 views

I woke up and my email has been signed up to hundreds of online services. How can I fix this?

I woke up this morning to over 900 emails of several online services asking to confirm I’ve made an account. Last month my email had been compromised and they managed to get into my eBay and Amazon ...
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0answers
42 views

In the context of emails, what can be digitally signed and what should be digitally signed in the sub context of deal documents?

I was once a customer of a certain developer who sold a SaaS bookkeeping software which allowed sending deal documents (invoice, receipt, etc) to a customer, from the software's very own email server, ...
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40 views

What usually happens to the symmetric (session) key after decrypting an email? Can the key be recovered if changing private keys?

I've been preparing for a CISSP exam and was reading about applied cryptography in regard to email. It's my understanding that the popular schemes (PGP,S/Mime) use a combination of asymmetric and ...
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1answer
58 views

What is the standard way, if any, to announce via e-mail that you have a public PGP key and what it is?

I'm making an e-mail system/client. I'm trying to correctly detect incoming e-mails which can be replied to with PGP encryption. This means finding out their public PGP key. I currently do: Parse the ...
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1answer
47 views

How email sent with S/MIME are stored?

I use Outlook to send email. In order to encrypt them, I use S/MIME with a signed certificate. I don't find the answer on how the storage of the email I send is performed. First option as I am the ...
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1answer
109 views

Protecting a website from being kidnapped

I have a MediaWiki website in Hebrew; As common with MediaWiki websites, it has lots of content and rebuilding it in case of a disaster isn't feasible. I chose to give that website a Global TLD (a non ...
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0answers
29 views

Security Risks of CID Image Embed?

I am putting together an email and have been asked to embed the images and to reference their ContentID in the HTML so that the email is self contained (no requests out to download the images from our ...
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1answer
101 views

Full disk encryption and remote unlocking a mail server in the hand of a possible attacker, what could go wrong?

Since I cannot receive email directly from my home server, I need an external device to receive messages for me and deliver them to my MTA via another port or via VPN. Instead of renting a VPS just ...
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0answers
22 views

Should I be concerned about websites emailing me my plaintext password after signing up? [duplicate]

In multiple instances lately, I have received the plaintext passwords I entered(not given to me) emailed to me after signing up. The sites in question have been legitimate small businesses, so I ...
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1answer
150 views

How can Tutanota, ProtonMail and Hushmail all claim to provide privacy when they only allow privacy-incompatible payment options? [closed]

I'm attempting to register an e-mail account without destroying my privacy. The reason is simply that one is necessary to be able to register on a different service (web host for my new, very non-...
5
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1answer
130 views

Whom should I report spam emails to?

Today I received an email from a person in "critical health condition" who wants to give me about $10 million. It is clearly some kind of scam. What should I do with the email besides not ...
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8answers
10k views

What is the suggested best practice for changing a user's email address?

I recently jumped onto the hypetrain for an unnamed email service and am currently on my way to update all my accounts on various websites to get most of my (future) data off Google's Gmail. During ...
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3answers
209 views

Zero Knowledge Proof of ownership of an email address

Let's say that we want to develop a blogging service where only people with an @example.com email can contribute. Prior to post submission, the user requests that a large random token be generated by ...
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1answer
66 views

Why can I still receive email at my old domain after someone else bought it?

My domain expired years ago and was registered by another party. I have already read Can someone read my E-Mail if I lose ownership of my domain? and see that the answer is yes. Now if someone buys ...
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1answer
80 views

Phishing email from a contact

I received an email from what looked like a friend, it had a suspicious link I inspected the email address and saw that the username was spot on but the domain name was totally different. I also put ...
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4answers
158 views

Can a hacker access your email address and then choose to do nothing?

I have done a bit of research on what hackers look for in an email address, and it looks like any information is valuable to them, but a friend that knows about the subject has told me that it was ...
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1answer
88 views

What exactly is a “Combo List”, and why is this site providing them for free?

After asking for e-mail lists the other day, I got linked to this: https://combo-list.com/ This is a very strange "blog" which appears to be regularly publishing (or linking to, rather) ...

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