Category: Mail relaying
FortiMail – Howto configure DLP
The previous post showed the steps necessary to enable DLP. This post describes the workflow to configure DLP. I needed DLP to relay outbound messages to a specific mail relay based on header information. At first I create a DLP rule to define the matching conditions. I match specific header information, which is added to a message … Read More
FortiMail – Howto enable DLP
FortiMail has the option to use Data Loss Prevention as enhanced security mechanism. This feature is introduced in firmware 5.3, according to the release notes. By default the DLP option is not visible on the GUI. DLP can be enabled via the CLI, but it is a well hidden feature. The option can be enabled … Read More
SMTP Auth testing via CLI
Just a quick note to describe the procedure for SMTP auth testing via the command-line. At first you need to encode username and password in Base64. This can be done in several ways. The easiest way would be via https://www.base64encode.org/. Next you can use the following commando’s via telnet to test SMTP AUTH. I always use … Read More
Export StartTLS certificate from SMTP server
While configuring Office365 as the messaging (SMTP) server within Aruba ClearPass, I needed to upload the certificate from the StartTLS session to the certificate trust list from ClearPass. I had to export the certificate for smtp.office365.com via the following OpenSSL command: openssl s_client -showcerts -starttls smtp -crlf -connect smtp.office365.com:587 After running the command, you will see … Read More
Barracuda – Mail Protocol Violation
A customer updated the firmware from a Barracuda SPAM &Virus 300 firewall. The firmware was upgraded from version 3.4 to version 3.5.12.024. After the upgrade no email was coming in or going out through the Barracuda firewall. All email was blocked and the following reason was visible in the message log: Mail Protocol Violation At … Read More
Secret Barracuda Spam firewall options
While troubleshooting a Barracuda Spam Firewall 300 I found a forum on internet, which shows you how to get an extra tab under the Advanced configuration of the Barracuda Spam Firewall. The “secret” configuration page is enabled with the following steps: Logon to the Barracude Spam Firewall 300; Click on the Advanced tab; Add &expert=1 … Read More