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Tuesday, January 21, 2020
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Cisco ASA Disable ESMTP Inspection

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Problem Yesterday my colleague Ben called me over to the help-desk and asked “Have you ever seen this before?”...
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Mail Routing Issue ‘451 5.7.3 Cannot achieve Exchange Server authentication’

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Problem While putting in a New Exchange 2010 server today, I test moved a mailbox to this new site,...

Why do you see XXXXXXXA after EHLO and “500 #5.5.1 command not recognized” after...

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Introduction This document describes why you see "XXXXXXXA" in mailserver communication and TLS failures associated with the Cisco Email Security...

Cisco Bug: CSCsh33982 – (E)SMTP Multiple Content-Type headers check is wrong

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Last Modified Sep 23, 2017 Products (1) Cisco ASA 5500-X Series Firewalls
Viettechgroup Exchange2019

Exchange 2013 / 2016 Enabling TLS 1.2

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I have recently been working with a customer to upgrade to Exchange Server 2016, one...
Viettechgroup Exchange2019

Exchange Server TLS guidance Part 3: Turning Off TLS 1.0/1.1

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Overview In part 3 of our Exchange Server TLS Guidance series, we introduce how to turn off TLS 1.0...
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Exchange Server TLS guidance Part 2: Enabling TLS 1.2 and Identifying Clients Not Using...

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Overview In part 2 of our Exchange Server TLS Guidance series we focus on enabling and confirming TLS 1.2...

Exchange Server TLS guidance, part 1: Getting Ready for TLS 1.2

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Update: With the Office 365 deadline to have TLS 1.2 enabled being moved from March 2018 to October 2018 we have changed the timing...
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Exchange TLS & SSL Best Practices

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Note: for more up to date guidance on TLS, please see this post.Whether you are running Exchange on-premises, in the cloud, or somewhere...
Transfer Roles Ad2019 Demote

Downgrade Instructions (Demote) Active directory from the system after converting WS2008 R2 FSMO AD...

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Continuing Part 1 Conversion Guide WS2008 R2 FSMO AD to WS2019 (ADDS) P1. I will guide part 2. ...