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

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5
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1answer
466 views

Can my ISP read my gmail even when using HTTPS? Is there a way to prevent that?

Can my ISP read my gmail or other email even when using HTTPS? I guess they can do that since they are the "man-in-the-middle". Is there a way to prevent that? This is related to the news that in ...
1
vote
2answers
54 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 ...
1
vote
3answers
70 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 ...
3
votes
1answer
90 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 ...
1
vote
1answer
35 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 ...
1
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0answers
40 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 ...
1
vote
2answers
101 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 ...
3
votes
2answers
69 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 ...
4
votes
1answer
58 views

Opening mail from IMAP with no risk for the user

I'm building a website for an association. Its aim is to, out of other thing, provide an easy mail manager to communicate with the member, stored in a database. This database is always up to date as ...
1
vote
1answer
62 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 ...
4
votes
8answers
519 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 ...
1
vote
1answer
21 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 ...
5
votes
4answers
1k views

How can hackers guess passwords (using dictionary attack or brute force) without being locked out?

Nowadays almost every website you want to register in; is asking you to create a complicated password...But why cant we use simple passwords? I am just wondering because in case of multiple wrong ...
30
votes
2answers
3k views

Is email less secure than voicemail, snail mail, or internet portals for transferring sensitive information?

Where I am in the US, health care providers refuse to send anything through email (e.g. even something as trivial as an appointment reminder). Often they claim that email is not secure. Instead they ...
0
votes
0answers
60 views

Is this login flow via an authenticated email account safe?

I want to have users log in by entering an email, and then proving that they control that email. I only care that they do control the email, and so want to avoid add another password to the process if ...
2
votes
3answers
69 views

Email account 'hacked'; do I need to regenerate my server's DKIM _domainkey?

I'm just learning about DMARC (DKIM/SPF), so I apologize if my question doesn't make sense. A few days after I installed a DMARC policy on my server I noticed that the reports from yahoo.com ...
-3
votes
2answers
59 views

Does company email can access hangouts and private emails? [duplicate]

I'am curious whether the administrator's has the privilege to access the hangouts chat and the email of employees? For example, here in our company we are using the gmail as our private email ...
27
votes
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 ...
2
votes
1answer
49 views

Preventing users abusing emailing feature of web application

Our web application offers users with the option to bulk email a bunch of interesting information to multiple email addresses at once. It's fairly easy to register an account with the service and thus ...
-4
votes
1answer
185 views

Trace email without header or IP address [closed]

I have a gmail address only. It is a copy of the email. I do not have the original email. Is there anyway to trace it?
0
votes
2answers
540 views

How to report abuse spam with X-AntiAbuse header which was added to track abuse?

I've received the following spam e-mail (with the link to viagra site): Return-Path: <silviani@server04.funet.co.il> Received: from server04.funet.co.il (server04.funet.co.il. [212.29.215.70]) ...
0
votes
0answers
53 views

What does proxyexec + cagefs.server mean in the e-mail X-Source-Args?

I've the following headers in the e-mail which I've received as spam: X-Source: X-Source-Args: /usr/sbin/proxyexec -q -d -s /var/run/proxyexec/cagefs.sock/socket /bin/cagefs.server X-Source-Dir: ...
4
votes
2answers
636 views

How can I prevent my E-mail address from being used as the sender for fraudulent/scam messages?

Recently, me and at least one other person I know received an obvious scam E-mail that starts off something like this: We considered your resume to be very attractive and we thought the vacant ...
2
votes
2answers
384 views

Will using a self-signed SSL certificate on a mail server hinder communication?

According to this ArsTechnica article, using a self-signed certificate on a mail server is a bad idea: When we set up a Web server in our previous series, getting SSL/TLS working was a ...
6
votes
3answers
122 views

Why can't PGP/GPG Web-of-Trust be automated?

We heard lots of complaints about hard to use crypto tools, and recent ideas of Google how to fix this. I had another idea about this which seems quite obvious, but couldn't find anything about it on ...
2
votes
2answers
57 views

Secure alerting for a monitored web application

What is a good method to receive security alerts? Email is the first thing that springs to mind, although it is susceptible to MITM attacks (e.g. an attacker preventing the email from being ...
1
vote
2answers
91 views

Recovery email for email services

The famous Mat Honan hack got me thinking about e-mail password recovery, and how any link in the chain can break all the links preceding it. In Mat's example, that link happened to be the last link, ...
-1
votes
1answer
51 views

IP address question [closed]

I traced a header on an email I received, the person claims to have sent it from Maryland, but I traced the IP and it shows shows San Jose, CA and also contains loop backs, ??? Is this possible?
-1
votes
2answers
73 views

Can passwords be figured out via public wifi? [duplicate]

Few different scenarios: 1a) On public McDonalds wifi, logging in gmail account (or any account such as skype). Can a random user who is using the same wifi somewhat intercept the signal and figure ...
2
votes
1answer
86 views

Is it possible to track the email sent via BCC List using firewall or network security software?

I want to know whether is it possible to know the conversation/email sent via BCC can be identified by admin in some corporate companies? I have heard that email sent from BCC cannot be identified, ...
0
votes
2answers
210 views

Gmail spam from contacts. How does it work?

I don't know why it seems IMPOSSIBLE to find a blog or any security expert explaining the procedure of how this 'hack' works. My wife is receiving emails from people she's emailed through Gmail ...
1
vote
1answer
37 views

Location Obfusication and Email/remote login

Would it be possible for a user of a 3rd party VNC software package and email client to obfusicate/spoof their location, so that an employer would be unable to determine the location from which the ...
0
votes
1answer
38 views

emailing a direct link to executable file blacklist risk

I hope this is in the right place, don't know where else to ask. I would like to automatically send a download link to people that directly downloads an executable. The executable is a verified and ...
1
vote
1answer
400 views

How to tell computer of origin sending email messages? [duplicate]

I’m not a security expert. I wasn't sure if I should post this question here or in "exploit". I have searched for answers before posting.... Could anyone tell me how I can determine if emails are ...
-1
votes
1answer
129 views

How do I force kill an OWA, Activesync, or Outlook session?

A user with a BYOD is still able to access the email system, even after the user account has been disabled and password changed. Since it's clear that a re-authentication event doesn't continually ...
0
votes
2answers
111 views

Is it bad if one uses the same email address on different sites/forums?

Is it bad practice if one uses the same email address on different sites and forums?
2
votes
2answers
151 views

Using + for email addresses to find out who is selling your data: is it naive or is it effective?

It's pretty common among security-minded folks to fill in addresses using e.g. foo+company@gmail.com when disclosing their email address to company so that they can tell if company has sold their ...
1
vote
2answers
359 views

Are newly-generated recovery passwords sent to me via email hashed? [duplicate]

If a company sends me a new password via SMS/email because I clicked "forgot my password." Does that mean the company is not actually hashing my passwords?
3
votes
2answers
90 views

What is the point of secure email gateways?

We run Exchange 2010. Our edge servers run "passive opportunistic TLS" for 99% of the domains we communicate with. For a handful of domains, we have forced TLS on both our end and the other domain's ...
62
votes
4answers
9k views

What are the security reasons for disallowing the plus sign in email addresses?

My question is based on this tweet after I commented about forbidding + symbols in email addresses. The tweet says, "This is a measure we've taken for security reasons." This can be frustrating and ...
0
votes
2answers
64 views

What are the disadvantages to the site owner to have third parties e-mails displayed publicly?

I frequently have to remind my members not to post their e-mails due to spam bots. One of them told me he doesn't care about that since his spam filter is good enough. If I allow him to do that, are ...
-2
votes
1answer
43 views

Track mail sender from Mesh network [closed]

Mesh network have one router connected to WAN or Internet so IP address is allocated to that router will be exiting point for all the nodes.. and other routers will have Internet connection from that ...
1
vote
2answers
79 views

is this secure: email account that can only be accessed by sending and receiving emails within gmail

i am creating a game of sorts where you use and earn credits to accomplish tasks. I am curious if you can effectively use gmail's security features to secure these submissions if the emails are all in ...
1
vote
1answer
87 views

how to trace or get evidence you've been hacked [closed]

my devices and my network have been compromised. I foolishly left my router unprotected and they were able to gain access to all my apple devices and then install some sort of software that will take ...
0
votes
1answer
154 views

How to stop gmail spam after connecting to public wifi without VPN on Android?

About two weeks ago, I had to reply to an urgent email (gmail) on my Android phone with the Gmail app. Unfortunately, my VPN client refused to work that day (Private Internet Access Android Client), ...
-4
votes
1answer
116 views

How i can stop already sent email? [closed]

I have a Gmail account. Unfortunately I have sent an email from my Gmail account. How I can stop or back this email ?
0
votes
2answers
51 views

Attaching the same file to two separate email, does it compromise security of the “message”

When using (Thunderbird and) GnuPG to send a PGP/MIME message to two separate recipients, with the text body different in both messages, but the same file attached to both of them, does this give an ...
5
votes
1answer
274 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 ...
1
vote
2answers
73 views

Is there a secret-sharing public-key-encryption-based service? [closed]

I need to share some sensitive information with someone else who can only communicate via E-mail. I don't love the idea of sharing this information freely over email in plain text, so I was ...
0
votes
3answers
1k views

VPS Privacy: OpenVZ vs KVM vs Xen

Considering OpenVZ, KVM and Xen: Which VM technology is the most difficult for the host's administrators to access given an encrypted root partition? Can I have a reasonable expectation that rogue ...