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

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1answer
107 views

Test if an email address is spammer's

How can I test if an email address is a spammer's? I received a reply to my Craigslist post, with a gmail address in the email body. Craigslist uses some way to hide my email addresses, if I choose ...
4
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5answers
250 views

Using unique email address for online signups?

After reading the recent social engineering of a user's twitter handle, I started thinking about ways to improve my own online security. We can only do so much too protect ourselves because at the ...
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1answer
229 views

Clicked link on fake email which appeared to be from friend [duplicate]

I receieved an e-mail which at first glance appeared to be from a friend, I clicked on the link provided without thinking as we would often exchance links to sites. The link went nowhere i.e page not ...
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3answers
5k views

TLS library problem when connecting to Dovecot

I have a Comodo PositiveSSL certificate issued for mail.btcontract.com and I've set up Postfix and Dovecot to work with it in the following way: Postfix main.cf: smtpd_tls_cert_file = ...
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3answers
4k views

How to Stop Email Spoofing [closed]

Apart from SPF, what else can be done to stop hackers from spoofing your company's email addresses?
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0answers
48 views

Webistes listing email address lists for spammers [closed]

Which websites would you usually check if you suspect that your company's address book has been leaked and is being used by spammers? I have identified https://pwnedlist.com/ for this purpose but was ...
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6answers
5k views

How are ProtonMail keys distributed?

There is a service called ProtonMail. It encrypts email on the client side, stores encrypted message on their servers, and then the recipient decrypts it, also on the client side and the system ...
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2answers
180 views

Is it possible to restrict email accounts within one computer?

can emails(e.g gmail)can be configured to open-up only in my laptop ,my operating system is windows 8 and is it possible to restrict my gmail account to be opened up only in my computer?Usually we ...
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1answer
67 views

Endpoint for checking if user exists in system

I have question regarding users point of view of this endpoint /api/user which requires POST data: email=user@domain.com and returns {"user@domain.com": "exists"} I am concerned if users might think ...
28
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10answers
6k views

How to explain to a customer that spamfilters don't catch everything

I used to work in a small office which provided basic desktop support for users. One day I had to answer a call from a very angry customer and he asked for my boss. He wanted to know how could one ...
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6answers
5k views

How did the spam email sender get my name?

Some time ago I bought something online from a reputable website. I paid through my credit card and everything worked fine. The thing which is important to note is that the name used on the credit ...
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3answers
165 views

Potential risks when sending plain text E-Mails with encrypted attachments?

To ensure privacy in communication I encrypt and sign E-Mails using gpg4win. However, sometimes the communication does not work as expeceted (GPGTools and Outlook/gpg4win seem to be incompatible). In ...
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1answer
126 views

Tracking sender of Email via email address ONLY

Is there a way to track the sender and the location via the email address only. The problem is somebody has created a similar sounding email id to send content to my official circle with a view to ...
28
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3answers
3k views

Tell people that I can encrypt emails

I know that it is still not very easy to use PGP for an average user. However, the situation is improving (there are some easy plugins that can even nicely integrate into your GMail webmail). In ...
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2answers
2k views

Based on these email headers, where is this virus coming from?

I'm seeing a virus in our network with some strange headers. Sometimes they are coming (sourced) from a netscaler VIP, other times they seem to come from an Exchange hub server. How do I determine ...
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2answers
132 views

Viruses From Email Attachments

My company just got a worm. The specific one is beside the point, but I linked a couple pages that I think describe the worm / virus below. We're getting lots of emails to Outlook asking us to open ...
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3answers
16k views

Is a password protected PDF file safe for bank statement attachments?

My bank emails my monthly statement to me in a password protected PDF attachment. Is this a secure method of transmitting something as sensitive as bank statement?
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1answer
1k views

Is this email from Liliane Bettencourt a scam? [closed]

I received the following email from someone claiming to be the second-richest woman in the world, Liliane Bettencourt. I, Liliane authenticate this email, you can read about me on: ...
6
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2answers
258 views

Have both my email address and IP been spoofed, or has someone gotten my password, or…?

Just examined a spam email sent to me. The header's "originator" has both my email address and my web site's IP address, (my SMTP). My first thought is that someone has obtained my email password ...
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1answer
2k views

How to secure my network, laptop, ipad and email accounts which are possibly hacked?

Background Last month I noticed lots of failed emails in my inbox and after few minutes I lost my access to my Yahoo Mail. My friends informed me that they have received spam emails from me. So I ...
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1answer
149 views

help identifying an IP address from email sent from my gmail account

Someone sent the following email from my gmail account. I believe it was hacked and if I can find the IP address I may be able to identify the person who did it. Here is the information. Please let me ...
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1answer
116 views

How is PKI used to encrypt an e-mail for multiple recipients?

My understanding is that when an e-mail is encrypted and sent to a recipient, the recipient's public key is used to encrypt the e-mail, and then only the recipient can decrypt it with their private ...
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1answer
138 views

Spam Mail - have someone broke in to my shared hosting account? [duplicate]

Yesterday I noticed that one of my e-mail addresses (the only one within that domain) started to receive a lot of weird messages that the mail haven't reach the target (something like "Sorry, Qmail ...
3
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1answer
535 views

Wrapping my head around Protonmail

I've been trying to grasp how Protonmail could work. From what it gather, it works like this: When you signup, you create an account password and a mailbox password. A PGP private/public key pair is ...
5
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1answer
518 views

How is ZixCorp able to provide email encryption without a password?

I am trying to understand how/if an email I received is being encrypted. A financial institution sent me a verifiable email (i.e. not phising) asking me to fill out a pdf form to complete a ...
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1answer
107 views

Email obfuscation/munging recent research [closed]

Does anyone know of any recent (past year or two) research into email obfuscation/munging? All I can find are tests done five to ten years ago. I'm trying to decide whether it's something still ...
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3answers
586 views

Postfix master running as root

Does running /usr/lib/postfix/master as a root could cause a security threat ? A fresh installation, gives this : root 11622 0.0 0.0 4792 1432 ? Ss 19:11 0:00 ...
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5answers
18k views

Email headers from messages sent via Gmail online client contain private IP addresses. What are these addresses?

Someone has sent a sensitive email from my Gmail account. I wanted to trace the IP address by checking out the Received: by X field in the header of the sent message. However, every message that is ...
3
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1answer
547 views

Email clients and POODLE vulnerabilities

I use a commercial email service that provides IMAP over SSL on port 993 and SMTP over SSL on port 465. I currently connect to their servers with Thunderbird and the Apple's iOS8 email client. Could ...
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2answers
206 views

E-mail tracking countermeasures

I've started using Sidekick to know when an email is opened or one of the links in it is clicked. What I ask now is how to know if an email I received is provided with a similar tracking system. With ...
12
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2answers
1k views

Should I change phone number and e-mail address after PayPal fraud?

I have been the victim of PayPal fraud. I hadn't used PayPal in a year and then within 9 days there were three unauthorized transactions on my account for a total of 150 Canadian dollars and 290 ...
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3answers
1k views

Gmail, Yahoo, Hotmail , and so on; How do they check the content of an attached password-protected archived file like Winrar?

How is it possible that mailing systems like Gmail, Yahoo, and Hotmail are able to check the content of an attached password-protected archived file like WINRAR, if the password cannot be guessed, ...
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2answers
184 views

How can one verify that two separate emails are not coming from the same place?

I sell merchandise online. Due to suspicious activity (in my very amateur opinion), I have reason to believe that, what seems like two separate orders, are actually a single scam being perpetrated by ...
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3answers
15k views

Someone keeps using my email address. What to do?

I have had a GMail ever since it was created, so it's an email address that is easy to remember, but also easy for somebody else to get confused with. Since I'm not going to post my email address ...
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2answers
118 views

PKI expired and renewed, do my correspondents have to do anything?

My PKI certificate (Digital ID for email from Symantec, issuer is "VeriSign Client External Certification Authority - G3") expired after 1 year and so I have renewed it. Do the people I correspond ...
3
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2answers
234 views

How do web email clients store my passwords from other providers?

The situation comes down to this: When I enter in hotmail, it retrieves my messages connecting to other providers: they could only do so by using my email and password. Since I had signed in a ...
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2answers
106 views

Having a consistent “dont reveal email addresses of members” policy [duplicate]

Developers are dogmatic on having "invalid username or password" on login screens; our applications should not reveal if somebody is a member given an email address. But there are two other ways our ...
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3answers
3k views

How to check if range of IP addresses are SPAM blacklisted?

While it's easy to check if a single IP address is blacklisted for SPAM using for example http://www.spamcop.net/bl.shtml, then is there a way to check multiple addresses at once? For example how to ...
3
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1answer
229 views

How to sign and encrypt mail using openssl?

I am trying to send and encrypt mail using openssl. So far, I figure I should use theese commands: cat ${content} | \ openssl smime -encrypt -inkey lib/me.crt -aes256 -subject "$titre (cs)" -to ...
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3answers
81 views

How safe is it for an app to trust a click on a link in an email?

In my question and answer application, Joe signs up, logs in and adds a question. He then shares the question via email to his trusted friends. How safe is it to provide a link within that app ...
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1answer
75 views

PCI Compliance for attachment in email

I am wondering if they are any PCI compliance issues around users of a service sending email with attachments that may or may not contain sensitive information through said service? As an example, if ...
10
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4answers
4k views

How do I encrypt the source and destination IP address, along with various parts of an email?

If the subject makes no sense to you, that's fine, it makes no sense to me. I've been tasked with securing emails sent from some devices, and I'm looking for advice on intelligent questions to ask to ...
4
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8answers
3k views

Is it possible to prove a certain email has been sent using a certain computer?

I can understand that an SMS can be traced to the mobile phone which it has originated from and the phone owner has no chance in court but to claim that someone else has used his phone but what about ...
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2answers
137 views

Unexpected emails have been sent - do I need to wipe my Android?

A few days ago I received a Notification from my Android saying that it could not send mail because an attachment was too large. I opened my Gmail App and found 5 messages in the Sent Mail folder ...
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0answers
101 views

Using email to authorize access to a user's account

would greatly appreciate some advice from the experts here on this stackexchange. I'm building an application that requires access to a user's resources from a 3rd party application. This 3rd party ...
3
votes
2answers
82 views

How do I respond to a spam server that invalidates my tokens? [duplicate]

Our web application sends a one-time use generated token, in the form of an URL, to clients who forget their passwords. This works except for the case where the client is sitting behind another server ...
9
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4answers
3k views

Good, simple list of reasons that email is inherently insecure

I've been searching for a while, trying to find a good get of information about the inherent risks of transmitting sensitive data via email. I'm really looking for a comprehensive list of all the ...
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1answer
118 views

How to share sensitive documents with unknown/untrusted parties?

My exact use case is that I'm starting a new job, and I need to transmit sensitive personal documents to support my application. However, the same applies for applying for a loan, buying a house etc ...
2
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4answers
322 views

Is e-mail sent from a Gmail address to another Gmail address encrypted?

Gmail provides an SSL connection and also encrypts the entire session by default. But if you send a mail, once it leaves gmails servers, it can be read at any point on the internet. But what about ...
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1answer
28 views

Can I keep large encrypted files in my mailbox on mail provider server?

Is there any restriction or policy of large e-mail providers (such as GMail, Yahoo, Hotmail and similar) for keeping/storing large encrypted files by the users within their disk quota in 3rd party ...