Questions tagged [email-spoofing]

Email spoofing refers to the process of sending fraudulent emails that appears to be from someone that it is not.

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61 views

Spoofed email? “X-Source-Sender” and “Received” headers look dodgy

I got sent an email from someone in response to an over 2 year old exchange, and the contents of it look like spam to me. Checking the headers the following looks normal: Return-Path Received & ...
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I received a phishing/spam email from Google Delivery Subsystem about an email I never sent. How? [duplicate]

Screenshot: The text covered with red is exactly my email address except the end is @google.com instead of @gmail.com. The suspicious link "Unsubscribe_click_here" is: mailto:cr@burlondesti....
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Does SPF protect against spammers who control the initial MTA?

I understand that for most users, the Envelope-from address is the most difficult part of an email to spoof because (I assume) it is checked by the receiving MTA i.e. if you attempt to spoof the "...
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I have a custom domain for email. Do I need to configure DNS to prevent outgoing text messages with an address from my domain? [duplicate]

I own a custom domain that I use for e-mail. The mail server is configured with a catch-all that redirects messages to any user to my inbox. For the first time this afternoon, I received a benign &...
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How to track anonymous email sender (alternatives to IP tracking) [duplicate]

Are there any ways to get information on who is sending certain emails from an anonymous email address? Besides the obvious IP solution, would there be any alternative such as embedding some kind of ...
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Spoofed DNS-Address in Spam mail header

There is a recent rise in Spam mails sent from seemingly legit german email-addresses according to the mail headers: Received: from mx1.aok.de ([91.199.166.49]) But when I nslookup mx1.aok.de, I get ...
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57 views

php / email / iis

in a certain page I have a newsletter subscription form, where the user enters his e-mail address and then through PHP an authenticated e-mail is sent to myself with the user's information (e-mail ...
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66 views

Why can't mail clients verify an email was sent from the user and server it claims to be from?

Background When I explain to my clients the security issues around email spoofing, I often explain that emails are like regular mail. Anyone can write Jon Doe on the return address, but that doesn't ...
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2k views

Amazon gift card phishing/spam — what's the point?

I recently received an email message with the subject "San Diego Site Leadership and Management Team sent you an Amazon Gift Card!", sent to my work address, apparently from "Amazon.com ...
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163 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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283 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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104 views

Let user send an email to register to prevent outgoing mail abuse

Problem Consider a standard sign-up form (user enters an email address, we send a confirmation link). Even limiting that form per IP (or even globally per hour), I'm concerned about abuse: Our real-...
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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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I received an “Undelivered Mail”, is my email address used maliciously?

I received an "Undelivered Mail Returned to Sender" email, which is quite suspicious. The message is displayed in Thunderbird like this: From: someRandomStuff my.name@mail.provider Date: 24....
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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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Reply to potentially spoofed email

A colleague recieved an unsolicited email along the lines below: Dear Ms. Smith please click on the following link to recieve Document X regarding Project Y. Yours, Eve Nobody eve.nobody@company.com ...
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243 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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What does it mean to get an email from someone with a different actual sender?

I got a strange email and I just want to confirm my suspicions. For background, I have my own email server which I set up using iRedMail on a VPS. I have an acquaintance who most likely has me on ...
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What can I do to get rid of spam emails that come from different, randomized email addresses?

Here's an example of the address they're coming from: I'm familiar with filtering settings, but how can I filter something that's different each time?
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76 views

Email sender spoofing check from receiver

I understand there are techniques to prevent someone from spoofing your domain in emails. Is there any guarantee or check that the receiver can do to ensure the sender is authentic? Gmail shows TLS ...
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1answer
72 views

Emails with links offering job

I am a designer. I have received several emails offering jobs. There is a link. I never click to links in emails. I look at the sender address and look at google to see if it could exist a real firm ...
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How to deal with Registered Envelope Service (CRES) if you are not using this service

First of all, I am not using CRES, but many of our clients use it. I want to know the best approach to manage all communications with our clients that use CRES. I want to avoid using CRES webmail ...
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How do I run through the DKIM authentication?

I am currently reading on DKIM authentication for email and I would like to manually try to run through it (to facilitate my understanding of DKIM), but I would like to verify if it is possible to do ...
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5k views

Microsoft account security alert - Is this legit? [closed]

I've just received two emails in a row stating that "We detected something unusual about a recent sign-in for the Microsoft account" and "someone else might have accessed the Microsoft account..." (...
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Postfix maildrop -> pickup “from:” verification [duplicate]

I was surprised to notice that sending E-mail from local server account allow any user to send message with: From: whatever@whateverdomain This is a security issue, because it allow identity ...
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Saved email attachment not reflecting the actual sender of the email but the email of the person who received the email attachment as sender

I have come across certain scenarios which confuses me on how it is possible to manipulate email headers. The person who received an email(A) from person (B), forwarded me (C) the email as Original ...
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2k views

Enforcing DMARC policy (reject) on an Office 365 tenant

The domain & tenant has SPF and DKIM properly configured and DMARC policy set to p=reject. Still, emails spoofed with the domain in the From header aren't rejected, but appear in the Junk Email ...
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139 views

Phishing emails - What do I look for?

I want to be able to spot a phishing email. What are the things to check when investigating and doing forensics on one? There are some things I know to look for already but I want to get moer ...
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37 views

Do we need SPF when we have DKIM? [duplicate]

I always thought that to authenticate email we needed both SPF and DKIM (and DMARC). But email is confusing and recently I found myself asking why we can't do with just SPF or DKIM. I then discovered ...
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1k views

Possible Scam - reply address appears to be yours [closed]

Have received the following email which I believe to be a scam Internet Crime Complaint Center (IC3) In Partnership with: Swiss National Fraud Relief Center (NFRC) Case/Reference ID: IE3033900045 We ...
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1answer
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emails were send from my own email address [closed]

A friend of mine has just received an email from my exactly own email adrress. What could this be and how do I stop it?
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How to test email spoofing with this php script? [closed]

I want to harden my SPF setting. However I have trouble testing my SPF setting. I want to be able send a test email to try out my new SPF settings. Most of the resource on internet seems to be use ...
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Is there a way to block/filter spoofed emails Office 365/Exchange?

My company is currently a target of some social engineering attacks where company employees are being sent e-mails from the attacker pretending to be senior members of staff. They have the correct ...
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88 views

Is it possible to hijack specific e-mail with remote access? [closed]

I was recently presented with e-mails that look like they came from my e-mail and IP address but I didn't send them and never saw them. It is a back and forth correspondence with another gmail account....
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1k views

GMail Hack with 2-Factor Auth enabled

I have my business email on GMail. I use 2-factor authentication for access to said business email. I access my business email from 2 computers and 1 mobile Android device. I do not use Outlook or ...
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1answer
218 views

I received an phishing email from myself [duplicate]

So today when I was checking my spam folder on my outlook account, I noticed I had received an email from my own address. The email looks like a typical scam: Claims to have installed a RAT on my ...
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127 views

Logged in with a hacker's email address

I have an active account at ebay-kleinanzeigen.de (like Craigslist in the US). Today I got a valid email from them that my email address was changed. On my mac, I opened up my ebay-kleinanzeigen ...
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147 views

What prevents malicious servers from spoofing mail transfer agents and/or mail delivery agents?

An email system typically consists of multiple agents: Mail user agent (MUA) Mail submission agent (MSA) Mail tranfer agent (MTA) Mail delivery agent (MDA) Evidently the 'middlemen' of this system ...
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1k views

How Concerning Is This X-CU-modified: FAKECU Text Attack?

A user clicked on the link of this email and entered their credentials, thinking the message was legitimate. However, the link didn't redirect to the fake site, and instead their mail client sent them ...
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17k views

Possible attack via Netflix; what action should I take, if any?

Late last night I received a "password reset" email from info@mailer.netflix.com. It looked legit, but I had not requested a password reset. I checked my account's "recent account access" but saw ...
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57 views

How to detect a spoofed email with Outlook Web Access?

I am specifically asking about Outlook Web Access (browser based Outlook), and not for any other email service or program. Within Outlook Web Access, is there a way to tell whether or not an email ...
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1answer
362 views

Spam/Phishing detection when there is no MX record

While SPF/DKIM/DMARC are standard, foundational tools to help protect an email-sending domain from spoofing, what about domains that do not send emails? How do spam or phishing filters treat emails ...
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3answers
874 views

SPF and Office 365 email accounts spoofing other Office 365 email accounts

After an incident, I have a question which answer's I cannot find. I cannot provide the real headers as they come from a client. Let’s consider a company which uses an Office365 tenant as mail server....
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663 views

I clicked a link in an email message. What should I do now?

I got a message that looked like an ad from Microsoft. At the end, there was a message saying "You can simply WIPE Out your email from Mailing List click here". I clicked. I got to a page this ...
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970 views

How did a phishing email pass SPF, DKIM and DMARC?

A friend received a spoofed email (from Bank of America using an uber.com address) which was correctly identified as 'spam' by Gmail. However, looking at the raw message it seems to have passed SPF, ...
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127 views

What is the reason for DMARC spec to not require specifically SPF or DKIM pass?

DMARC produces "pass" result if and only if at least one of SPF and DKIM checks pass. It has been noted that DKIM provides stronger protection of the two (if implemented properly). But, in order to ...
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51k views

Bogus Instagram account using my email, never been verified, has over 1000 followers

This appears to be a phishing scam like I've never encountered before. I received an email from security@mail.instagram.com to an email address I rarely use, but I noticed it because messages get ...
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424 views

Received ransom email containing my password. How did they get my password?

Finally, even I got the fabled ransomware emails we've all heard about so much. First, let's look at the facts before I get to my question: I use Mozilla Thunderbird as my email client. I was ...
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1answer
146 views

How was I spoofed?

I am trying to figure out how we were spoofed for education purposes. The email came in perfectly with the user's email address and name. The only way we found out was the header information. Most ...
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85 views

Can an attacker discover email addresses without gaining server access?

Present situation: I am receiving emails at a few of my email addresses, different domain names, all housed on the same server. The emails ares spoofed (appear to be coming from each of the email ...

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