# How your ISP store you Emails? **URL:** \ **Category:** How2's\ **Created:** [December 9, 2025, 11:00pm UTC](https://forum.gnoppix.org/t/how-your-isp-store-you-emails/3251 "2025-12-09T23:00:21Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![amu](https://forum.gnoppix.org/user_avatar/forum.gnoppix.org/amu/32/7_2.png) [@amu](https://forum.gnoppix.org/u/amu)\ **Post date:** [December 9, 2025, 11:00pm UTC](https://forum.gnoppix.org/t/how-your-isp-store-you-emails/3251/1 "2025-12-09T23:00:22Z")
**To make it short, in clear-text.** if you’re interested how, continue 🙂 # The early bird Back in the **1990s** , I was working at a really **huge ISP**. We dealt with **DDoS** and the usual attacks, along with a lot of abuse. On one occasion, a user was **blackmailing** the company daily. Our **Director came down to us**! and asked if I could take a look into the situation. I was lucky! I found out the email **used to send the blackmail** was hosted somewhere else in the world, and none of my friends had connections to the hoster. Suddenly, I had an idea based on the **used username**. People generally use the same email/username everywhere 🙂. So, I manually logged into this other account and tried to recover his user login on the other server. Yes, a few moments later, I had a **recovery link** in his mailbox (on our servers). I changed his **local mail account** and changed the password for the other access. It didn’t take **30 minutes** before my Director came again and asked how I did that. “ **This is magic!** ” he said. The guy had called, **apologized profusely** for the problem he caused, and asked to recover his password. You didn’t need to call the police, nor were they interested in such things. I didn’t give away any private information on the other account; I just changed the passwords. **Today, this properly would be a crime and you’re punished, but in 1995, no one cared.** My friends ask me why I am so **paranoid** about privacy. With **30+ years of experience** , it’s not because I’m selling drugs or doing bad things, but I have a lot of stories to share (which I can’t really) due to confidential cases. I’ve learned how to **set up and maintain a mail server** , and I’ve also learned about the **dark side**. Today, my things are **post-quantum encrypted**. Not that I have something to hide, but **just because I can do it**. **Furthermore, I also find it questionable when certain groups exploit my know-how for other purposes.** **On the other hand, I also find it questionable how the state monitors us and assumes we are all criminals.** But that is another topic.Back to Email ## RFC RFC 822 specification defines an electronic message format consisting of header fields and an optional message body. The header fields contain information about the message, such as the sender, the recipient, and the subject. If a message body is included, it is separated from the header fields by an empty line (`\r\n`). The following example illustrates a message in the RFC 822 message format: [Example] ```auto From: someone@example.com To: someone_else@example.com Subject: An RFC 822 formatted message This is the plain text body of the message. Note the blank line between the header information and the body of the message. ``` How we send emails manually: 1.) telnet [mail.mymailserver.com](http://mail.mymailserver.com) 25 Use the `HELO` command to tell the mail server which domain you are coming from: ```auto HELO gnoppix.org ``` 2.) Now we need to state from which address this email will be sent. ```auto RCPT TO: someone@example.com ``` 3.) we can start writing some subject and body. To do that we need to use the `DATA` command. First type `DATA` followed by `Subject:` and the body. Once done, enter `.` to send the email to be queued. ```auto DATA Subject: Sending an email using telnet Hello, Here is my body? Do you like it? cheers . ``` 4.) Do not forget “.” at the end of the message. To quit, type: ```auto quit ``` Now you can check your mailbox to ensure that it has sent correctly. ## How it looks like You log into the Mailserver as Admin, you look for something like this: ```auto root@mail:/var/mail/your-data-dir/data/domains/gnoppix.intern/username# ls -l total 8 drwxr-xr-x 9 mail mail 4096 Nov 7 00:36 Maildir drwxr-xr-x 2 mail mail 4096 Jul 26 09:51 sieve ``` We move into Maildir: ```auto total 372 drwxr-xr-x 9 mail 4096 Nov 7 00:36 . drwxr-xr-x 4 mail 4096 Jul 30 04:50 .. drwxr-xr-x 5 mail 4096 Jul 26 11:15 .Drafts drwxr-xr-x 5 mail 4096 Oct 6 06:28 .Junk drwxr-xr-x 5 mail 4096 Jul 26 11:15 .Sent drwxr-xr-x 5 mail 4096 Jul 31 06:29 .Trash drwxr-xr-x 2 mail 4096 Nov 21 02:38 cur -rw-r--r-- 1 mail 10796 Nov 7 00:36 dovecot-uidlist -rw-r--r-- 1 mail 8 Jul 26 09:51 dovecot-uidvalidity -r--r--r-- 1 mail 0 Jul 26 09:51 dovecot-uidvalidity.6884a540 -rw-r--r-- 1 mail 2584 Sep 26 22:40 dovecot.index -rw-r--r-- 1 mail 282700 Nov 7 00:36 dovecot.index.cache -rw-r--r-- 1 mail 7780 Nov 7 00:36 dovecot.index.log -rw-r--r-- 1 mail 2208 Sep 27 06:28 dovecot.list.index.log -rw-r--r-- 1 mail 1479 Nov 7 00:36 maildirsize drwxr-xr-x 2 mail 20480 Nov 7 00:36 new -rw-r--r-- 1 mail 23 Jul 26 09:51 subscriptions drwxr-xr-x 2 mail 4096 Nov 7 00:36 tmp ``` The interesting part is the **new** folder, this is where all new mails going in, the **cur** folder is if a user got the new email and read it. ## Sending a testmail ![test_mail](https://forum.gnoppix.org/uploads/default/original/1X/55b4ea7e42a83df2361dc0b525bbb46c9e73189e.png) Check on the other DST server, the email reached the box we can check the logfiles. `2025-12-09T21:02:35.988Z [12E5E763-137B-4544-AB40-AE83D8ACADE9.1] 7.112.28.96:53648%gnoppix.intern () -> - [-1.89][<35ebca53-1afe-4633-980b-959dbdc69de0@gnoppix.org>] 250 Message Queued (12E5E763-137B-4544-AB40-AE83D8ACADE9.1) (12E5E763-137B-4544-AB40-AE83D8ACADE9.1)` Yes, that **looks** cryptic, but the importance here is the **250 Message Queued** status. Unfortunately, we do not know now **if** the message is flagged as spam or **contains a virus** and has been moved **into quarantine**. Therefore, we can check if the email arrived in the recipient’s **inbox** (or the **new mail folder** ). ```auto ls -l -rw-r--r-- 1 mail mail 12640 Dec 9 21:02 '1765314156.M5581P1874745.9925427d1982,S=12640,W=12853' ``` that may work (it’s a read/only email only account, for this I removed the **delete all incoming emails** function) We can read the hole email now in plaintext with : ```auto more 1765314156.M5581P1874745.9925427d1982,S=12640,W=12853 ``` And here is the content, we’re looking for: ```auto Date: Tue, 9 Dec 2025 16:17:50 -0500 MIME-Version: 1.0 User-Agent: Betterbird (Linux) Content-Language: en-US To: selfservice@member.gnoppix.org From: Andreas Mueller Subject: testmail Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Haraka-Karma: score: 1, connections: 1, history: 0, asn_score: 1, asn_connections: 2, asn_good: 1, awards: 131, fail:rcpt_to X-p0f-Result: os="Linux 2.2.x-3.x" link_type="Ethernet or modem" distance=9 total_conn=5 X-Rspamd-Bar: / X-Rspamd-Report: DMARC_POLICY_ALLOW(-0.5) XM_UA_NO_VERSION(0.01) R_DKIM_ALLOW(-0.2) MIME_GOOD(-0.1) R_SPF_ALLOW(-0.2) X-Rspamd-Score: -0.99 X-Haraka-GeoIP: JP X-Haraka-GeoIP-Received: x.x.x.x (censored) Testmail ``` What also works, since I’m root/admin I can run > mutt -f Maildir and get: > i:Exit -:PrevPg :NextPg v:View Attachm. d:Del r:Reply j:Next ?:Help > Date: Tue, 9 Dec 2025 16:17:50 -0500 > From: Andreas Mueller [amu@gnoppix.org](mailto:amu@gnoppix.org) > To: [selfservice@member.gnoppix.org](mailto:selfservice@member.gnoppix.org) > Subject: testmail > User-Agent: Betterbird (Linux) > > Testmail I worked in my **early years** at ISPs, managing mail servers. Authorities **would come in** (with a court order) and request the content of **User X’s mailbox**. As an admin, you would **compress** the folder and put the **zip file** onto a USB drive. This took less than a minute. Also, surveillance was often requested, **especially** since the SMTP protocol became encrypted. **A common method was simply to add a so-called alias (a copy of all incoming/outgoing mail):** > `alias: user-x@domain.com, surveillance-target@isp-admin.com` In this case every incoming email to user-x went automatically to [surveillance-target@isp-admin.com](mailto:surveillance-target@isp-admin.com) without the user-x knowing emails are copied. ## Solution ? Today, I built a secure email server for a project that handles all the features modern mail servers require: checking for viruses, spam, RBL testing, **AND encrypting content**. Call me a freak but AI is included too, OSS AI of course. Instead of using the **almost 40-year-old solution** of saving emails in **cleartext** , the emails are now stored in a database, **completely encrypted**. ## I’ve sent an email to myself **take a look:** Message-ID: [9e211740-5062-489d-9b80-54be68a87d32@gnoppix.org](mailto:9e211740-5062-489d-9b80-54be68a87d32@gnoppix.org) Date: Tue, 9 Dec 2025 17:16:12 -0500 MIME-Version: 1.0 User-Agent: Betterbird (Linux) Content-Language: en-US To: [amu@gnoppix.org](mailto:amu@gnoppix.org) From: Andreas Mueller [amu@gnoppix.org](mailto:amu@gnoppix.org) This is an OpenPGP/MIME encrypted message (RFC 4880 and 3156) --------------WpiPkbXG9D7U6Inn2A8qy0e2 Content-Type: application/pgp-encrypted Content-Description: PGP/MIME version identification Version: 1 --------------WpiPkbXG9D7U6Inn2A8qy0e2 Content-Type: application/octet-stream; name=“encrypted.asc” Content-Description: OpenPGP encrypted message Content-Disposition: inline; filename=“encrypted.asc” -----BEGIN PGP MESSAGE----- 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content. This setup is basically a clone of your master disk; if one disk fails, a second disk goes active. This is another **easy possibility for someone to get data**. **Not with my mail system.** **Even if** you were able to decrypt my passphrase, you would **still need to do the same** for all the other users. Every email is encrypted individually using the **recipient’s unique keys**. **I cannot access the emails anymore** ## Key Generation and Trust Models Contrary to general standards, I decided to **generate the keys myself** and combine them with a login and a **private key phrase (passphrase)**. Someone could accuse me of having stored the passwords and private keys during the creation process, which is theoretically possible. This is not meant to be an accusation against providers like Proton, for example. After all, it is now possible to create and upload your own keys there. However, the average user thinks everything is secure, but it’s not: **Proton created your key and knows the password**. 😇 Again this is no offense against Proton. They concept is make money while we have fun, testing technologies. During the automated key creation, or change password process it’s possible for the data to be intercepted and stored elsewhere. So, what remains? **The user must take matters into their own hands and create their own key and enable end-to-end encryption.** ## Here is how: > **[Gnoppix GPG Encryption](https://wiki.gnoppix.org/features/keygen/)** > > Email and File Encryption > **[Gnoppix Post-Quantum Email Service](https://wiki.gnoppix.org/community/email/)** > > Post-Quantum Encryption > **[Post-Quantum\_Cryptography\_-\_\_A\_Comprehensive\_Guide.pdf](https://www.cnlab.ch/fileadmin/documents/Publikationen/2025/Post-Quantum_Cryptography_-__A_Comprehensive_Guide.pdf)** > > 2.55 MB