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

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2
votes
2answers
235 views

How to tell if an email is encrypted, or just corrupted?

Ran a recovery program (Kroll Ontrack) on a Windows 7 PC and recovered many, many emails. Almost all of them open in my Windows 10 mail client (and Thunderbird), except for a handful from this March. ...
2
votes
1answer
51 views

Are there any standard practices for protecting against malicious links being entered in a public form?

A website I'm working on needs to have a form for any visitor to submit a request for information about a service. The user will not need to create an account, and contact details are just part of the ...
0
votes
1answer
144 views

Is it safe to be showing my WAN and LAN IPs in my email headers?

I don't know how to hide my LAN IP from my email recipients. My LAN IP shows up next to my WAN IP in my outgoing email headers (sent to my other accounts and viewed by me). I have not seen emails sent ...
0
votes
1answer
95 views

Email sending out spam to many contacts

I'm asking on behalf of a friend. A few days ago, I received a email with his full name (with no subject), thought that's from him. But when I opened it, there was only an obvious spam link, and I ...
2
votes
1answer
85 views

Can I trust Google Scripts on sites like Labnol?

For example, consider this script. It requires me to grant permission to my Gmail account, but I'm confused why this is necessary -- is it not myself who is running the script? Or is my data going ...
8
votes
3answers
292 views

Is it enough to look at the sender's email address?

I use Gmail. When I receive an email, Gmail displays the sender's email address. So far I've always looked at this address when receiving sensitive mails, to avoid phishing. For example, I know by ...
1
vote
2answers
212 views

Is this a legitimate Microsoft email or is this a Phishing email and how can I tell?

I am a mobile application developer using Microsoft Azure with my MSDN subscription to develop my back-end of the application. Today I got the following email: So given my above background this ...
206
votes
15answers
10k views

Tracing the location of a mobile IP from an email

I'm a TV scriptwriter - and not hugely tech-savvy, so please bear with me... If the police have an email, sent by a suspect over a 3G or 4G network, could they use the IP address (since they know ...
2
votes
3answers
147 views

Emailing debit card details to a guesthouse

I'm trying to arrange a holiday out to the Aran Islands, and the guesthouse emailed me back confirming that they do have a room available. But here is the catch: they want me to email my credit card ...
3
votes
1answer
281 views

Why does my SHA256 certificate get encrypted with 168 bit 3DES?

We use S/Mime certificates for internal emails within our company. The certificates signature algorithm are all SHA256RSA with a hash of SHA256. I have confirmed the public keys are RSA(2048bits). ...
0
votes
1answer
70 views

Avast attempts to connect to the Internet when I try to download email [closed]

The file AVAST (Software\Avast\AvastSvc.exe) tries to connect when I check my email. When I forbid access to the internet for AvastSvc.exe, I can't connect to POP3 & SMTP. I'm not sure where all ...
1
vote
0answers
40 views

What should I do when I find out some company user database I am listed in was leaked?

Today the antispam tool in the company I work for blocked several emails. It has been months since last time, so I took the time to analyze the quarantined messages. Since I almost never give my ...
1
vote
1answer
96 views

How can I contract an email tracking service and be silent about it?

I use a customized e-mail and my web-master, who is also the domain owner, doesn't allow me to see the settings that the DNS provides. Some DNS services provide, beside domain name registration, ...
3
votes
1answer
98 views

Where can I find a feed of actual spam emails? [duplicate]

I am looking for a feed of e-mail spam messages. I searched for one but found nothing that I can use. Does anyone know a site or service that offers a feed of actual spam messgaes that are currently ...
4
votes
1answer
91 views

How secure is my system for a password reset?

I am using my custom Parse Server with Heroku which I am pretty sure (99%) that it is decently secure using things like oAuth2 and 1 way hashed passwords. The problem is I am trying to implement my ...
2
votes
0answers
37 views

Something phishy going on with email [duplicate]

I own my own domain. For a month or so I've been getting emails from addresses I don't know with "see attached image" or "find the attached invoice", with a zip/rar file attached. Of course, I ...
4
votes
0answers
157 views

Using your full name as your work email address? [closed]

Standard practice in the workplace appears to be using your full name as your email address. This presents some privacy concerns to me. Even though we all grew up being told it's advisable to use a ...
0
votes
2answers
2k views

How hard is it to hack into a webmail account with a strong 8 character password?

Assume the hacker starts with only your email address and he has high incentive to gain access. UPDATE: Also assume the password is unique (never used elsewhere) and it is NOT a guessable word like ...
0
votes
2answers
59 views

Reducing the success ratio of email harvesting

Would / does the following work to hamper email harvesting by spammers ? Since spammers - among other things - do automated email harvesting by looking for email addresses in web pages, it follows ...
-3
votes
2answers
115 views

Is it more secure to delete emails from the server once a client has downloaded them?

From this email provider We strongly adivse people to download their email whenever possible, so as to lessen the amount of personal private data present at any time on the servers. Does ...
3
votes
1answer
88 views

Revoke access from intranet if an employee leaves the organization

A question has been on my mind lately. Say you have a global organization with intranet which does not exist, but it is supposed to be developed. This organization has offices in maybe 50+ countries, ...
1
vote
1answer
31 views

How does Mail.app handle account credentials?

I am looking for an iOS email client that is reasonably secure (ideally, this means that it doesn't store user credentials outside the device - so something like Spark or Outlook for iOS are a no go ...
0
votes
1answer
36 views

relationship between anti-spam solutions and whois databases

Are there anti-spam SMTP proxies(like ASSP, qpsmtpd) or e-mail spam filtering solutions in general(like SpamAssassin) out there which create for example block filters based on objects in RIR databases?...
1
vote
2answers
90 views

Registration Email Hijacking

(Please read the update at the end) I am trying to find out how to send user registration emails securely. I read answers on this question: I don't intend to send passwords in emails, but I was ...
1
vote
1answer
28 views

Securing Web Contact Forms Against Spams

I created a web contact from with the following restrictions: An IP can send only 1 query per 8 hours. A generic text based bootstrap captcha for the form (I know this can be replaced with ...
1
vote
1answer
44 views

Rerouting emails to external account

There was a case when employee A thought he was getting legitimate emails from employee B, as the email address was valid, there were no CC/BCC addresses and just plain text in the body. Some ...
3
votes
3answers
342 views

Is sending email between different Office 365 domains (and organisations) secure?

Is sending emails between different Office 365 account owned by entirely separate entities secure? I.e. The email never leaves the Microsoft network? If the two are in the same data centre (E.g. ...
11
votes
2answers
669 views

Replay attacks and PGP email encryption

From my understanding of PGP email, the following is possible: Alice sends a message to Bob. Then Bob can take that exact same message and send to Carol while making it seem to Carol like it is from ...
14
votes
3answers
2k views

Are combined sign in / up pages dangerous, and how to improve them?

I'd like to code a combined sign in/up page like the one in the picture below. My colleague said this will allow spammers/hackers to see what email addresses are registered with our system and ...
4
votes
1answer
110 views

“Hacking” account when someone uses your email?

I have, on multiple occasions, received this email from Twitter: Since I have received it multiple times either this person clearly thinks the email is theirs or it's spelled similarly, something to ...
1
vote
1answer
71 views

How does my unused e-mail address get spoofed? [closed]

I have 2 e-mail accounts - one on GMail and other one on a popular mail provider in my country (O2). GMail has a secondary e-mail set for security - that is the O2. I started getting e-mails from ...
1
vote
1answer
39 views

How to properly use PGP for e-mail encryption/signature (key generation, key rollover, etc.) [duplicate]

To improve my privacy, I would like to use PGP to encrypt/sign my e-mails. How should I proceed to use PGP in a secure fashion? I am trying to think about how to do it properly. From what I found, ...
1
vote
1answer
99 views

How to deal with spam that contains my personal details?

I just noticed some spam in my inbox in GMail that is from a very suspicious e-mail address (partially redacted anonymous@webXXXXXXX.ad.aruba.it) containing a link to a similarly suspect URL (http://...
1
vote
5answers
79 views

Using an e-mail service anonymously [closed]

What are the options, to use an e-mail service anonymously without exposing yourself (your private info, name etc.) ?
3
votes
1answer
117 views

What happens when encrypted email is in-transit?

If you're using a service that offers end-to-end encryption, what happens when you send an email to another non-encrypted email address? Let's say I write my email in ProtonMail and then send it to a ...
3
votes
1answer
181 views

Has my server been compromised? (Ransomware related)

I just received an email that corresponds to the description here, which was posted just a couple of hours ago: https://myonlinesecurity.co.uk/pdfpart2-pdf-sent-from-my-samsung-galaxy-note-4-powered-...
3
votes
1answer
106 views

How does ProtonMail manage search?

There is a service called ProtonMail that encrypts email on the client, stores encrypted messages on their server and sends it encrypted in some fashion (depending on what email service the recipient ...
3
votes
2answers
150 views

Is email sent form a Java web-app over a HTTPS connection encrypted?

I'm working on a Java web-application which runs on a HTTPS connection. This application sends emails to its users. I want to protect those emails from man-in-the-middle attacks and other potential ...
3
votes
1answer
49 views

Does using the same mail and web server increase a risk of DDos due to IP exposure?

I use the same server for sending my emails and web hosting. I send user registration and support forum mails from my server and occasional marketing mails or newsletters. I read on a CloudFlare blog ...
7
votes
3answers
95 views

Best practices for sending tax data to and from a tax professional

I started doing business with my tax preparers when we all lived in the same city. Recently I moved to a different state. I requested that they send my "Tax Organizer" which contains some personal ...
4
votes
2answers
100 views

Notifying users of a possible security breach

Yesterday, a coworker informed me that a user had opened a malicious e-mail containing a .dotm document which she could not open. I undertook the usual steps to prevent the malware from spreading to ...
2
votes
4answers
156 views

Is it possible to fake incoming IP?

I would like to whitelist an IP address on my smtp server so that non-authenticated emails on connections originating from that IP could be routed. I control that other IP, so I can make sure that ...
2
votes
1answer
108 views

How does MailChimp authenticate emails?

Keeping it short, MailChimp states that: Authentication Should Be Simple Email authentication is useless if it's too hard to implement. Many email service providers require server setup in ...
2
votes
1answer
117 views

Cisco Registered Envelope Service (CRES), big security flaw?

While researching so called HIPAA compliant email providers, I came across Cisco Registered Envelope Service(CRES), which claims to be HIPAA compliant. According to this instruction, upon receiving ...
2
votes
1answer
377 views

How Risky is Paribus?

Paribus (https://paribus.co/) is a service that automatically gets money back for you if there's a price drop on a product you purchased. It seems to work by monitoring your email, to which you must ...
0
votes
1answer
165 views

Where email orginates [duplicate]

I keep getting emails from an unknown person. In the header file, I see this: authentication-results: spf=softfail (sender IP is 25.152.82.59) smtp.mailfrom=outlook.com; gmail.com; dkim=none (message ...
20
votes
3answers
3k views

How does a company like CloudFlare block bot crawling and email harvesters?

I saw this on CloudFlares homepage: CloudFlare protects against a range of threats: cross site scripting, SQL injection, comment spam, excessive bot crawling, email harvesters, and more. How ...
3
votes
1answer
198 views

Is this encrypted information? Why is it in a URL?

There's a vendor who sends us reports full of links to articles. Some of these links, especially ones that perform what I'm guessing is an HTTP verb of some kind, look like this: https://...
29
votes
5answers
3k views

Safe email validation

I have been using this RFC822-compliant regular expression for email validation. Pen testers on HackerOne have used the following horrendous email addresses which satisfy the regex: '/**/OR/**/1=1/**...
1
vote
2answers
199 views

Pin delivery: SMS, mail, or pin mailer?

Imagine a scenario where a 4-digit pincode needs to be delivered securely to an end-user. Several possibilities exists: Pin mailer (this seems to be standard according to ISO 9564-1) SMS Email Email ...