Questions tagged [email]

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

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32 views

Tampering original email when forwarded [closed]

What are consequences of taking someone’s original work email and tampering it by manually inserting recipients under TO section of the original email and then forwarding it. The original email did ...
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0answers
43 views

Accidentally clicked spam email link on android, risk of malware? [closed]

I was browsing my spam folder on my phone in the gmail app and stupidly let curiosity get the better of me. The app had blocked images by default but I clicked to allow them as well as accidentally ...
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1answer
70 views

How can I perform a brute force attack on a webmail site which has no firewall and has an unlimited amount of tries? [closed]

My professor made this site for us and gave us a project to find the password if we have the email. Is it possible? Not sure if this is relevant, but the site isn't HTTPS also
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59 views

How can I brute-force the email id to reveal the email hidden behind the asterix in an account recovery page? [closed]

I know it is not possible to directly decode the asterisk. But that's when something struck my mind. If the hidden email is to******h@g****.com, and the person's name is Tom Smith, the email could be ...
35
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7answers
11k views

If I send a plaintext e-mail using Gmail to somebody, including my PGP public key block, is that secure?

I've been trying to figure out "practical encryption" (AKA "PGP") for many years. As far as I can tell, this is not fundamentally flawed: I know Joe's e-mail address: cool_joe@gmail.com. I have a ...
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2answers
103 views

Someone is using my email to create online accounts; what should I do? [duplicate]

I suspect it’s an attempt at getting into an existing account using a leaked email/password combo. I update my passwords regularly and do not reuse, so I don’t think the attack will be successful, but ...
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0answers
25 views

I've been an emailed a password; how can I proceed as securely as possible? [duplicate]

I am going through the on-boarding process for a summer internship with a well-known tech/bank company. I've received mail from HR requesting me to fill out an I-9 form via the external service they ...
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2answers
120 views

High bounce rate due to attacker is using website's mail system

We got a realatively high bounce rate today, because someone decided to spread some links using our mail server. The implementation looked like this: He used the registration form and planted a link ...
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1answer
63 views

Force specific encryption cipher for S/MIME mails

I have a number of contacts who can only decrypt 3DES, when it comes to S/MIME encrypted mails. I'm aware that this is by far not ideal, but better than no encryption at all. My problem is, that I ...
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2answers
96 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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1answer
49 views

DMARC & failing SPF

I would like to clarify the following scenario with DMARC, (assuming there is a publish DMARC policy): SPF fails No (aligned or any) DKIM records Should result of DMARC check be none or fail? ...
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31 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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0answers
41 views

Why have a password at all? [duplicate]

Consider the following common security scenario: I need to log in with an email and password. I can't remember my password so I click "forgot password" Website emails me a password reset link. I can ...
9
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3answers
196 views

Is there a benefit to using a different email for every online account?

I have a domain email address which in addition to being able to create multiple mail accounts allows the creation of aliases for each inbox. Is there any benefit to security in using a different ...
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0answers
29 views

How is this entity spoofing a PayPal email address? [duplicate]

Someone I know received an email from service@intl.paypal.com claiming to be a receipt for a purchase on their account. However, looking at the from line, there's another email next to the PayPal one ...
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2answers
206 views

What to do with a suspicious email from someone I know (seemingly using the real mail of that person)?

TL;DR, I think this mail was sent by mail.okgroup.cz. Not sure though, I would like confirmation. I just got a mail from my sister with no subject and only a link. NOTE; That the email used in this ...
3
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2answers
145 views

Can someone read my email if they have my smtp credentials?

Assume Mallory knows the server, username and password that Alice uses to send email via smtp. Can Mallory read Alice's email? Does it depend on the specific system or configuration?
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1answer
63 views

Is it possible to setup email servers to encrypt communication in transit?

I understand that generally email communication is insecure by default and would like to know if its possible to setup email servers so that the emails get encrypted when sent between hosts. I want ...
2
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1answer
167 views

If my protonmail password is compromised, does that potentially mean that my whole account is, permanently?

My (limited) understanding is that my password is used to encrypt the keys which are used to encrypt my mail messages on protonmail's servers. Does that mean that knowledge of my password could ...
45
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8answers
9k views

Why do email server/clients block executable attachments?

If I send an email with an .exe attachment to an Outlook recipient, the email client blocks the attachment and the recipient has no way of overriding this security setting (short of making certain ...
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0answers
44 views

Packaging Python code for github: should I obfuscate author email address from the `setup.py`?

The standard file with packaging instructions (setup.py with setuptools) for Python contains an author_email field. Such a package can then be published to PyPI, but the code is also available ...
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3answers
111 views

E-Mail privacy proxy for hiding real e-mail?

Do E-Mail proxy services exists to improve privacy and security? Privacy in the sense that one wouldn't need to give a website his/her username (possibly even in the firstname.lastname@domain.tld ...
65
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5answers
14k views

My email address is being used to enroll for online services. Should I be concerned?

Just before Christmas I received the following message in one of my GMail accounts: Sign-in attempt was blocked ********@gmail.com [redacted by me] Someone just used your password to try to ...
1
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3answers
169 views

POST requests are bypassing PHP checks

I have a website with a contact form on PHP and a mail server. Email are sent with the help of PHP mail function like so $name = cleanInput($_POST["name"]); $e = $_POST["email"]; $email = filter_var(...
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0answers
42 views

Email signature with PKCS11?

While S/MIME has been a PKCS7 standard, what happens while I sign/encrypt an email using a smart card implementing PKCS11? Is PKCS7 supported as kind of backward compatibility?
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2answers
217 views

It's possible to make an account in mainstream social media without giving them my phone number or have a phone number that can identify you?

I'm learning about privacy and security and one of the tips everyone always talk about is compartmentalization, I'm trying to do this and get rid of my old profiles in social media (one of them have ...
2
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1answer
61 views

ISP Email Issue on Port 25 [closed]

My ISP, a small, local “mom & pop” outfit, provides my email services. For the last six months or so, my main email account frequently fails to update with the following message, “Could not ...
3
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1answer
107 views

Putting personal Data in E-Mail vs sending password in plaintext to access that data

I started working on a service that sends out mails with a link to a registration form. (e.g. a registration for a movie premier) The link would look like this https://movie-premier.com/rsvp/USERCODE ...
1
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1answer
62 views

Can someone redirect or block emails of a specific sender?

I’m expecting some information from a governmental organisation, they claim that they already send the info via email, but I have never received anything. They also have an automatic reply email, ...
5
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3answers
177 views

How to prevent spam when sender email is never the same? [closed]

Recently, I have been massively spammed by emails, and unsubscribing via the link doesn't work. Another option is to block the sender, but the problem is that the sender email is never the same. It's ...
0
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1answer
67 views

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?
7
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2answers
366 views

Why do we receive contact form spam with random characters?

For the last two weeks we have been receiving a form of spam through our website contact form that I haven't seen before. It looks like this: Name: iYvNgmpTLwxqaCj Company: lqidQuVNMhIJsz E-...
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0answers
80 views

Recruiter pretends to have found my e-mail address through GitHub account. How to check if this is true? [closed]

A recruiter directly e-mailed me about a job offer and pretended to have found the e-mail address via my GitHub account. Normally I receive e-mails via LinkedIn and almost never directly, as I try my ...
3
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1answer
160 views

Can simply opening an email lead to a hack? [duplicate]

It is common to be wary of links and attachments in emails but I have heard some people say that opening the emails themselves can be risky. Are vulnerabilities that can be exploited simply by opening ...
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0answers
20 views

Are there any security vulnerabilities with domain email forwarding?

I recently bought a domain through CheapName.com which offers free email forwarding. I would like to use it to have a unique email for every account I make online (because it can be set up so all ...
0
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1answer
113 views

Someone I don't know is sending me test mail. Is this a scam? [closed]

In the last couple of weeks I've received several e-mails at my work account (a small research non-profit). The format is similar for all: "Test mail" in subject line No content in body Address ...
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0answers
45 views

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 ...
7
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2answers
922 views

Trying to understand the point of this scam email

I was reviewing my spam folder and spotted this: People are going to have one of two reactions: Hooray! Free porn! Confirm, confirm, confirm! OR OMG! I didn't sign up for porn! Now everyone can see ...
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0answers
80 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....
6
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1answer
227 views

Professor wants a Wireshark capture of mail client and browser activity of my own machine

As part of a home exercise in my networking class, the professor is asking students to submit a Wireshark capture done on the students' private machines. The capture must contain activity of the ...
-1
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1answer
84 views

Misspelled recipent, same or unique? [closed]

I have x.x@gmail.com as primary email-address, but per accident i sent confidential information to xx@gmail.com (note the dot). How will this be handled?
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0answers
13 views

Granting access to mailbox/calendar to another with MFA enabled?

Jane needs access to John's Outlook mailbox and calendar. When Jane attempts to access it (she has his UN & PW) John receives the MFA challenge preventing Jane from accessing it. This works ...
0
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0answers
15 views

IS saving attachment from outlook email to disk to enable reading of file content safe?

I am trying to make sure that the emails attachments are 'what they say they are'. I am using strings.exe https://docs.microsoft.com/en-us/sysinternals/downloads/strings and exiftools.exe https://...
3
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1answer
52 views

Can any private key information be exposed when signing an email? [duplicate]

So I know that PGP encrypted email can be vulnerable to a known-plaintext attack from a known, consistant email footer or greeting (“Hello”, “Yours truly, xxx”, etc), but does the same thing apply to ...
1
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2answers
462 views

Bypassing NET::ERR_CERT_DATE_INVALID

When I try to access the Openmailbox web site, Google Chrome returns a NET::ERR_CERT_DATE_INVALID error: "openmailbox.org normally uses encryption to protect your information. When Google Chrome ...
1
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1answer
69 views

Can a forwarding rule be set on Outlook that will not be visible on office365/exchange admin interface?

In an incident concerning a user's mailbox - will any rule that forwards emails to a potential attack be visible in the office365/exchange admin interface, or is it possible to set an outlook client-...
2
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1answer
129 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 ...
0
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1answer
75 views

Email including self-shredding macro after “Seen” flag is set

Bob sent an email to Alice with nothing much useful and tenuous ( but because it isn't useful it can ruin Bob's reputation if bad Alice decide to publish. ) Is there a way for Bob to include a ...
0
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1answer
112 views

Bizarre email sent from spam email address with contact details of someone I know and a friend of their's in it [closed]

Someone I know (call them Darren Smith) recently received a rather odd email. It was sent to their personal email address, emailaddresswithnonameinit@emailprovider.com. The "From" field had "Darren ...
3
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2answers
107 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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