Skip to main content

Add DNS record to enable DKIM in O365

When you try to enable DKIM in O365 you get yellow warrning line saying you need to provide two DNS records.

What you need to do is copy those two names from that yellow line and create CNAME record in external DNS:

Hostname:selector1._domainkey (THIS IS ALWAYS THE SAME FOR EVERY TENANT)
Points to address or value: **selector1-**._domainkey.YourTenantName.onmicrosoft.com (You paste first of the copied values here)
TTL: 3600

Hostname:selector2._domainkey (THIS IS ALWAYS THE SAME FOR EVERY TENANT)
Points to address or value: **selector2-**._domainkey.YourTenantName.onmicrosoft.com (You paste second of the copied values here)
TTL: 3600

In Windows DNS you would do:



Which later looks like:




Popular posts from this blog

Change SMTP port 25 in Exchange 2007, 2010

For some reason you might want to change default SMTP port number 25 Exchange 2007 is using. Exchange 2007 uses RECEIVE AND SEND connectors, one for receiving mails and other for sending mails (obviously ;) So you need to change ports on those connectors. I will not say those two, because you might be using more than two. You change Receive connector port by opening the connector properties in Exchange Management Console --> Hub Transport --> RECEIVECONNECTORNAME --> Properties --> Network --> Local IP Addresses (Edit Receive Connector Binding) Just to clarify what "Local IP Addresses" and "Remote Servers" are (from Exchange 2007 help), because I find it little bit confusing: Use these local IP Addresses to receive mail Use this list to specify the IP addresses and port numbers on which this Receive connector listens for incoming mail. Receive mail from remote servers which have these IP addresses Use this list to specify the

Netscaler vs Exchange 2019 "time out during ssl handshake stage

If you are using Citrix Netscaler as load balancer in front of Exchange 2019 server you must know this: Microsoft Exchange 2019 is secured by default and allows only TLS 1.2. Therefore default schannel settings are as follows (using IISCrypto tool from Nartac Software): While Citrix Netscaler offers following Cipher Suites: TLS_RSA_WITH_AES_256_CBC_SHA TLS_RSA_WITH_AES_128_CBC_SHA TLS_DHE_RSA_WITH_AES_256_CBC_SHA TLS_DHE_RSA_WITH_AES_128_CBC_SHA TLS_DHE_DSS_WITH_AES_256_CBC_SHA TLS_DHE_DSS_WITH_AES_128_CBC_SHA TLS_RSA_WITH_DES_CBC_SHA TLS_RSA_EXPORT_WITH_DES40_CBC_SHA TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 TLS_DHE_DSS_WITH_DES_CBC_SHA TLS_DHE_DSS_EXPORT1024_WITH_DES_CBC_SHA TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA TLS_DHE_RSA_WITH_DES_CBC_SHA TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA TLS_RSA_EXPORT1024_WITH_RC2_CBC_56_MD5 TLS_DH_anon_WITH_DES_CBC_SHA TLS_DH_anon_WITH_AES_128_CBC_SHA TLS_DH_anon_WITH_AES_256_CBC_SHA TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA Now, you will fi

The attempt to connect to http://yourserver/PowerShell using "Kerberos" authentication failed

The error you get: The attempt to connect to http://yourserver/PowerShell using "Kerberos" authentication failed: Connecting to remote server failed with the following error message : WinRM cannot process the request. The following error occured while using Kerberos authentication: The network path was not found If you removed Exchange server from the machine and installed it again, you can get following error when you open Exchange Management Console: The following error occurred while attempting to connect to the specified Exchange server 'yourserver.domain.com': The attempt to connect to http://yourserver.domain.com/PowerShell using "Kerberos" authentication failed: Connecting to remote server failed with the following error message : WinRM cannot process the request. The following error occured while using Kerberos authentication: The network path was not found. Possible causes are:   -The user name or password specified are invalid.   -Kerbero