One recommended way to help secure your Postfix mail server is enabling TLS (Transport Layer Security) for connections to and from Postfix. You can search for more detailed descriptions of exactly how TLS works, but basically it. It relies on a key and a certificate to help accomplish its purposes, and this article will walk you through generating a key, getting your certificate, and installing everything on your Postfix system to enable TLS/SSL for SMTP connections. The link for this article located at Steve Jenkis is no longer available. . Enhance your Dovecot mail service by implementing SSL with a no-cost Let's Encrypt certificate for secure IMAP transactions.. Postfix TLS Configuration, StartSSL Certificate, Secure Email, SMTP Encryption. . LinuxSecurity.com Team
Vulnerabilities in implementations of the STARTTLS protocol for establishing an encrypted TLS connection could allow commands to be injected into a connection. According to a description by the discoverer of the problem, Postfix developer Wietse Venema, the key point is that commands are injected into the connection before it has been secured/encrypted, but are only executed once the secure connection has been established.. Venema illustrates the problem with an example involving securing SMTP with TLS. A client sends "STARTTLS\r\n"; using a man-in-the-middle attack an attacker changes this to "STARTTLS\r\nRSET\r\n". The client and server then establish a TLS connection. The server now regards the injected RSET command that was added during the unprotected phase as if it has been transferred subsequent to the TLS connection being established. The RSET command in this example is relatively innocuous as it is a harmless protocol reset command, but other commands could be injected in a similar fashion. The link for this article located at H Security is no longer available. . Postfix engineer Venema elaborates on the STARTTLS vulnerability opening doors for command injection prior to establishing TLS. Discover the potential consequences.. STARTTLS, Command Injection, SMTP Security, TLS Protocol, Encryption Risks. . LinuxSecurity.com Team
For diagnostic purposes, it can be very useful to talk directly to your SMTP or IMAP server. Things get a little more complicated when encryption rears its ugly head, but with the right tools, it doesn't have to be a black art.. Almost all mail servers offer the option of encrypting connections. Two different procedures are used The link for this article located at H Security is no longer available. . Investigate platforms and methodologies to evaluate and improve email cryptography for safe interactions using SMTP and IMAP protocols.. Email Encryption, IMAP Security, SMTP Communication, Diagnostic Tools. . LinuxSecurity.com Team
The spam situation is rapidly deteriorating. The percentage of inbound SMTP traffic classified as spam can be as high as 40 percent for some organizations. With no end in sight to rising spam volume, Meta Group believes companies must be . . . . The spam situation is rapidly deteriorating. The percentage of inbound SMTP traffic classified as spam can be as high as 40 percent for some organizations. With no end in sight to rising spam volume, Meta Group believes companies must be as aggressive in combating spam as they are in combating mail-borne viruses. The number-one headache for mail managers in 2002 has been spam. Mail managers are bombarded with complaints from end users frustrated with the volume and increasingly salacious content of spam. The spam tide is stronger due to a few basic developments: Spam blocking works, so spammers must send out even more messages to get the same results. The link for this article located at ZDNet is no longer available. . The rising issue of spam impacts entities severely, with nearly 40% of incoming SMTP data marked as unwanted.. Spam Management, Email Security, Anti-Spam Solutions, Mail Filtering, SMTP Traffic. . LinuxSecurity.com Team
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