similar to: Can Dovecot reject unencrypted mail?

Hi, Is it possible to configure Dovecot to reject mail that is not encrypted. In other words: 1. If the user tries to send an unencrypted message from their MUA, the server rejects it. 2. If a third-party tries to send an unencrypted message to the user, the server rejects it. The end result would be that no mail stored on the server can be decrypted by the administrator. I am aware that: *

Am 11.06.2020 um 19:15 schrieb Ralph Seichter: > Generating backscatter is definitely not a good move, and it is even > prone to punish yourself. Better to reject the offending message with > a 5xx status code and some explanatory text or the URL. > > The various tests required to come to a decision about accepting or > rejecting the message can be executed in a milter.

* Andreas Born: > I meant the different stages when receiving mails over SMTP [...] I am well aware of the technical details of SMTP. Your comment is unclear to me because the OP did not make any limitations on when he wants to counter spam, so why would we artificially limit ourselves in this discussion? SMTP allows rejecting messages even after the whole body has been received (end of DATA

Am 09.02.2015 um 22:29 schrieb Leander Sch?fer: > I'm currently busy with a substiution of my current mail server. I'm > currently using > > * Clam-SMTP and > * SpamAssassin > > to fight Spam. I wonder if it is worth implementing AmaViS with > SpamAssassin backend instead and also using AmaViS to speak to clamd > directly. But I more and more wonder wether

* Marc Roos: > 3. system recognizes as this email never been seen before > 4. auto reply with something like (maybe with a wait time of x hours): > Your message did not receive the final recipient. You are sending > from a known spam provider Generating backscatter is definitely not a good move, and it is even prone to punish yourself. Better to reject the offending message

First thing first, this isn't necessary a Dovecot related thread and using a challenge-response system like the one suggested by the initiator ("click here if you're not yet another bloody SEO guru") is plain wrong for several reasons, having said that: On 12-06-2020 11:56, Andreas Born wrote: > Am 12.06.2020 um 02:03 schrieb Ralph Seichter: >> * Andreas Born: [...]

Hello List Quick overview of our set-up: Postfix / Dovecot (2.2.2.1) / MySQL Cluster on (at the moment) three Servers to create a HA environment where you could easily add additional servers as the demand or load grows. Circular dovecot replication is used so each server uses another one as replication partner and allowing one server to fail. Dovecot Proxy Feature being used, so we can use

Am 12.06.2020 um 02:03 schrieb Ralph Seichter: > * Andreas Born: > >> There exists one problem: at this stage of mail reception you have no >> body content nor header information on which a milter may perform >> deeper analysis, only envelope data. > > I am not sure what you mean by "this stage of mail reception", or what I meant the different stages when

Hi, we have following situation: I migrated our company mailserver from POP3 only to dovecot with IMAP and POP. We need to have unencrypted POP3 from our internal network, and the subnet our mailserver is in. Additionally, we now want to allow encrypted IMAP from the internet (for some defined accounts), preferably with TLS (which means I open Port 143 in our firewall). Now, how can I

I?m using dovecot to provide encrypted IMAP e-mail support for remote clients and it?s working great. However, I also need to set up a webmail front-end (Roundcube), which I?m hoping to have use unencrypted IMAP on port 143 (as only port 993 is available externally). The problem I?m running into is that I want to require client certificate authentication on port 993, but dovecot is apparently

https://bugzilla.mindrot.org/show_bug.cgi?id=1430 Summary: Restore support for "none" cipher, i.e., unencrypted connections Classification: Unclassified Product: Portable OpenSSH Version: 4.7p1 Platform: Other OS/Version: Other Status: NEW Severity: normal Priority: P2

On Jan 13, 2015, at 8:30 PM, Reindl Harald <h.reindl at thelounge.net> wrote: > > so what you want in your OP is just DISCARD in a sieve script and there is no point in "Using Dovecot LMTP it would be more optimal to kick a 5xx back" when the desired result is DISCARD > > why do you want the burden of keep the SMTP session with the client open until the mail is

Hi Folks, I have a couple of questions which I hope that you will be able to assist with, first some background. I run a few sendmail servers that run MailScanner/Spamassassin/sendmail (current versions) on Centos 5.4 and Centos 4.8 These boxes accept mail for a large number of domains (6000+) scan the mail removing spam and then forward the ham to another server for delivery. I am attempting to

Hi, I don't think this is a remote desktop issue. I can run the following code by remoting into both a Windows 7 machine and a Windows Server R2 machine. I can see the results on the Windows 7 machine but not the server. > library(grid) > grid.raster(1:10/11) Best regards, Terry Terry Seaward Risk Manager T +27 21 416 1923 terry.seaward@investecmail.com 36 Hans Strijdom

I've got an application that I can run under wine. It uses SSL to communicate with a server. Since it's using SSL I can't just sniff the network packets. What would be the best way to have wine be able to dump the unencrypted data to a file for analysis? If this requires modifying code, which files should I look at? -- Anish Mistry amistry at am-productions.biz AM Productions

Hi, Is there a way to make windows2000, xp and 2003 work with unencrypted passwords as a domain member in a domain with a Samba Server as PDC? Igor -- "F?r mich sitzen in deutschen Talkshows viel zu viele Leute mit einem Monatseinkommen von 20 000 Euro herum, die denen mit 2000 sagen, sie m?ssten den G?rtel enger schnallen" - Harald Schmidt

I am trying to use Samba between a RedHat Linux 9 system and several Win98 PC's. From the Win98 systems, I can see and access the Linux folders I have made available. I can see the Win98 PCs and their shared directories from the Linux box. Understanding that Win98 requires encrypted passwords, I have set the "encrypt passwords" keyword in the smb.conf file to "yes".

Hi, I am using dovecot 2.3.16, along with postfix and a PostgreSQL database for managing virtual accounts. I'd like to start using the mail-crypt plugin. However, I'm having a bit some difficulty understanding the documentation at https://doc.dovecot.org/configuration_manual/mail_crypt_plugin to reach my goal. I plan to ask questions about those issues by starting new threads in this

I'm running postfix + dovecot on my CentOS-7 home server. When I send myself a message I get this error message in /var/log/maillog: Aug 9 12:59:57 alfred postfix/lmtp[31336]: B0D02220748: to=<tim at localhost.gayleard.eu>, orig_to=<tim at localhost>, relay=alfred.gayleard.eu[private/dovecot-lmtp], delay=475, delays=474/0.03/0.02/0.09, dsn=4.3.0, status=deferred

Hi, everyone, I'm surprised how little exists on the Internet regarding this particular subject. Given the recent headlines, that is about to change, I'm sure. I have a need to send an automated response to all senders who attempt to send unencrypted and/or unsigned email to a specific mailbox on my system. (Messages originating from localhost should be exempt.) I would like for the