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

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3answers
219 views

What is the technical rationale behind intermediary email servers?

EFF's Survelliance Self-Defense (SSD) project has an illustration of how email over SMTP goes through intermediate mail exchange servers: AFAIK each intermediate servers is expected to add its own ...
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2answers
189 views

What kind of information can be found from email?

When an average person sees an email, he can see only part of an information enclosed in the mail. To see full information one can look at the source of an email, which shows more. Example of an email ...
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2answers
336 views

OWA + AD Lockout Policy: Quite the Mixture

Many organizations have webmail exposed to the world. These sites are often hooked up to AD for user authentication. Are there any specific security controls OWA (Outlook web app) has that would ...
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3answers
141 views

Is it insecure to send an email from a PHP script to an email address on the same domain?

I have a php script that sends an email using mail(). The php script lives on domain.com, and it sends the email to info@domain.com. Is this a secure transaction? The website runs over https.
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2answers
933 views

Security Certificate not from a valid authority

I have no real knowledge about this stuff so I figured I'd ask here for some answers. So I started to get this "Security Certificate not issued by a valid authority" error when using my email client ...
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1answer
99 views

Would this form of more seamless e-mail confirmation be secure?

When you ned to confirm that an email address belongs to a certain visitor to your site, would it be insecure to do it as follows: When the user visits your site, you give them a session token as a ...
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2answers
2k views

Safe to email images with personal information? or use encryption for images?

It's common knowledge not to email credit card numbers or other personal information. How about emailing photographs that contain personal information, such as a photo of a deposit? Regarding plain ...
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3answers
163 views

Secure design for handling mail attachments

I'm fan of split design for web browsing for security reasons - trusted web sites can be accessed via http proxy from pc clients, the rest of web sites via some remote desktop technology from specific ...
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2answers
915 views

How to encode letters in multipart/form-data to include CR/LF characters?

Part of HTTP request that should be sent to server with Content-Type: multipart/form-data; looks like: ------WebKitFormBoundaryQ7KGYev31biaJTW8 Content-Disposition: form-data; name="subject" ...
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1answer
1k views

Email not received when sent by our app, received when sent by outlook [closed]

We have an application that sends mail in bulk, via a mail provider (Mailjet). Our clients are professional organizations, and they send important mails about meetings and stuff like that, to about 10 ...
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1answer
53 views

Mail server security: Mails to internal receivers with faked sender address

I noticed that I am able to send emails from my company's mail server to internal receivers from faked inhouse sender addresses without problem and I'm wondering if this should be supposed a security ...
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1answer
34 views

Email address used by someone else to order on line [closed]

Someone, or however it's being done, is ordering things from all over the internet, using my son's old email address. He no longer uses that address, however, they are placing orders to our address. ...
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1answer
45 views

“Secure” emails from unfamiliar source(s)

The context is long, so I'll ask my question first. If an encrypted message is received from an unfamiliar sender and it's spam, how can I avoid receiving further messages of the same sort? If it's ...
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1answer
44 views

What information should be scrubbed before posting email headers in public?

To figure out a problem, I need to post mail headers on a public forum, I read What information can be gained from an Email Header? but I'm not sure what information can identify me personally from ...
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1answer
44 views

User account password encyption by web based emails service providers?

Do web based email providers like Gmail, hotmail encrypt user account passwords when saving them to their database? If they do, why does account information get leaked after a hack?
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1answer
35 views

Changing senders, same spam messages

We have a situation at work regarding to our mail filtering appliance and I was hoping that you could give us some insight on how to approach this issue. We've been receiving spam emails with the ...
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1answer
61 views

Is secure tokens send by email secure? [duplicate]

I'm struggling with the reset password function of a web app, the way i'm inclined to do it is by sending a token based url to the email of the user and than the user can access and reset its ...
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1answer
111 views

Opening mail without any risk [closed]

Before opening unknown email (not in spam folder) how we can identify no any danger inside the mail (with availability of active virus guard)
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2answers
41 views

Does forwarding email result in an extra “persistence” of it's copy?

I understand that when an email is sent from point A to B, it can persist in other locations while in transit from A to B. When forwarding email, can this increase the extra locations where one's ...
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1answer
44 views

How do apps tell if there is a problem with ssl?

Email clients and other software use ssl. But what if someone is doing a mitm with sslstrip? how can i tell?
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1answer
502 views

Outlook Client and DKIM [closed]

We have our domain email setup with SPF and DKIM - both which seem to be operating normally. When sending emails from webmail, DKIM (and SPF) are working correctly. We have some users using Outlook as ...
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1answer
631 views

Is my Postfix and Dovecot configuration secure?

Today I set up my first server with Dovecot and Postfix. These are excerpts from the configuration files: Dovecot: disable_plaintext_auth = yes ssl = required ssl_prefer_server_ciphers = yes ...
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1answer
101 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 ...
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1answer
683 views

Security implications for email address and url changes?

recently, we are seeing some From:, To:, Cc: addresses being rewritten from user1@companyA.com to: ...
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2answers
182 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?
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1answer
468 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), ...
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2answers
921 views

PayPal phishing attempt?

[This is a "soft" question and as such I'm not sure it's appropriate for this site. However, it does involve information security.] I have an email address, me@gmail.com that is not associated with ...
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1answer
125 views

Security of starbucks gift card redemption feature

Someone sent me a Starbucks gift card. The email contained a redemption link, and that redemption link ended in a long secure hash, much like those on github secret gists. Clicking the redemption ...
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1answer
161 views

Gmail Voicemail Encryption

I want to listen to my voicemails in a secure but convenient fashion. I plan do this by having my PBX encrypt the voicemail using openssl aes 256 cbc with salt and a single static password. The ...
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1answer
41 views

From a deployment and OPS perspective, should a S/MIME signing and encryption key have different expiration dates?

Assuming the client supports different keys, what is some rationale that should be considered for signing and encryption keys? The encryption key needs to be present on each device that is used to ...
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2answers
71 views

Is it secure to use email to add content to a website?

I have a website running a social network Buddypress. Users leave comments on other users "walls". What I would like to do is to allow users to reply to each other inside the email client, without ...
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1answer
85 views

Email and Black Hole List Submission? [duplicate]

I'm having trouble with a spammer and would like to begin submitting their messages to a few black hole lists. Unfortunately, I'm having trouble finding a list. For example mail-abuse.org now ...
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1answer
69 views

IP Address Same on Different Devices? [closed]

The IP address appears to be the same in the e-mail header even when e-mail is sent from different devices. Shouldn't the IP address reflect the device IP? The e-mail is set up through an exchange ...
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2answers
50 views

Is there any mail service accepting real id? [closed]

Most webmail services like gmail, facebook, yahoo,.. allow anonymous to create a mail address. If there is a security breach, user may lost important information on that address. They may add phone ...
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1answer
161 views

list of PKCS7 certificate file extensions

RSA (the company) devises and publishes the public key cryptography standards. In those standards PKCS #7 is a standard which defines how to encrypt and sign messages using PKI. PKCS#7 defines a ...
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2answers
310 views

Registration Password

Is it best to create an application that allows a user to sign up with username and email at the beginning and password once you click the generated email sent to you or should the password entering ...
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1answer
275 views

Emails are forwarded to wrong addresses and possible hacking?

Multiple email addresses for my domain have been compromised. My client forwarded me an old email which he sent me few days ago but I haven't received that email. That email was sent to an email ...
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1answer
209 views

Hack profile identification

What does it suggest about a "hack" when people I know get emails from me, but my email password hasn't been changed to lock me out? (Not a spoofed sender - I see some in my sent folder). If my ...
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1answer
82 views

How to pass an email address securely to a web application X embedded inside a web application Y

The scenario I'm trying to address is this: There is a web application Y which has an authenticated user. Inside Y, web application X is hosted (which belongs to a different domain). When X is ...
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1answer
471 views

Invalid Certificate when adding Gmail account to Apple Mail

Trouble seemed to start after upgrading to OS X 10.9. I stopped receiving email in an account I'd set up over a year ago. I removed the account and when I attempted to add it again, I was served a ...
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1answer
667 views

How do I determine S/MIME encryption used?

From what I understand it seems that S/MIME uses PKCS #7 which can handle various different types of encryption. How is the choice of encryption method made by the e-mail client and how do I know what ...
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1answer
208 views

email on hosting company's site hacked?

I have a friend who's has a site hosted by a company in the states. They think that someone has gotten access to their email account because any requests for support submitted via their website ...
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1answer
247 views

Using a separate email address for each contact

A lot of the people I exchange emails with use services such as Google Mail. Recently it occurred to me that Google must maintain a social graph based on who exchanges emails with whom. It bogs me ...
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0answers
18 views

Raspberry IP email on boot bypass [migrated]

I have configured my Raspberry Pi2 B+ to send an email through SMTPS (smtp.gmail.com:587) after the boot with the IP address of eth0 and wlan0. So Usually the eth0 will obtain an IP address by the ...
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0answers
19 views

Metadata and Adding Files

If a person had files they wish to add to a computer and had physical access to the computer could the docs or emails be added with false metadata to indicate the documents had been added at a ...
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1answer
130 views

Correct way of dealing with spam via impersonation

I've been having a recurring problem at work: My boss's contacts keep receiving emails with links sent by a fake adress. The adress always has my boss's name + a different domain name every time. ...
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0answers
183 views

USA PATRIOT Act and Office 365

I have a local Exchange server, which has several spam and email reception issues (Due to an expired subscription to a spam filtering system). I was looking at the Office 365 Exchange Online ...
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0answers
115 views

How can secure email be used while avoiding government attention?

Presumably all unencrypted email is available to federal agencies including IP addresses, header information, and email content (eg, through SMTP with or without SSL and TLS -- thunderbird has an ...
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2answers
457 views

Authenticating Hotmail's certificate and connection security

I've recently received the following error message from hotmail.com (or live.com) after I have logged in using Chrome browser, consistent using different accounts and computers (regardless of 2FA or ...
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0answers
76 views

Webmail for both deepnet and clearnet [closed]

I am looking for a free anonymous encrypted webmail I can access from both tor and the clearnet (i.e., no .onion) that is not based in the U.S., Canada, or in any way connected to a U.S. company.(I ...