550 relay not permitted distribution group contact Symptoms When trying to add an external contact inside a Distribution group. A failure delivery mail with the
Read MoreYear: 2021
Script to delete all DPM 2019 recovery points
The Story I have DPM server deployed and I got couple of Exchange Servers and with about 2 TB of data. I scheduled DPM to
Read MoreTesting Office 365 SMTP relay
In order to test Office 365 SMTP relay you will have to create a user with an Exchange online license. After the email is activated
Read MoreSecuring and Testing your Exchange Server with Pfsense HAProxy
– Using the CVE-2021-26855 Payload After the recent vulnerabilities that hit Exchange Servers On-premises I found sometime to install KaliLinux and try to check what
Read MoreExchange Server backdoor investigation tools
The Story After the disastrous exploit that was found in Microsoft Exchange Servers lots of corporations started immediately patching their servers with the latest Cumulative
Read MoreZammad throws error csrf token verification failed! Apache 2.4.41 Ubuntu 20.4
Symptoms: Right after a fresh installation of Zammad you implement Let’s Encrypt and you are unable to login to your Zammad portal due to the
Read MoreSecure Zammad with LetsEncrypt Certıfıcate on Ubuntu 20.4 Apache
The Story after installing Zammad ticketing system I tried to implement Let’sEncrypt certificate to secure the system but there was nothing available on the internet
Read MoreSecure Your DNS Traffic with the outside world
DoH in Microsoft Windows OS Until this moment Microsoft Windows OS doesn’t support DNS over HTTPS, The feature will most likely be implemented in future
Read MoreMimecast trust cert hacked in Microsoft supply chain
The Threatpost.com and other cyber security news published articles claiming that A Mimecast-issued certificate used to authenticate some of the company’s products to Microsoft 365
Read More3- Migrate Users from Skype for Business 2015 to Teams
Hybrid Integration In my last post about Skype for Business / Office 365 Skype for Business Online/Teams migration article I discussed the steps of
Read More