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Mike_Garczynski's avatar
Mike_Garczynski
Copper Contributor
Jul 27, 2023

Having issues connecting on prem smtp server to exchange online

I have an on-prem SMTP server which is being used by an application to email invoices.  The on prem server was setup with a connector and was working successfully.   Recently I had to change ISP whic...
exchange
Kidd_Ip's avatar
Kidd_Ip
MVP
Jul 28, 2023

Mike_Garczynski 

 

Please take a look at Connector to see whether an update needed such as IP address

  • Mike_Garczynski's avatar
    Mike_Garczynski
    Copper Contributor
    Jul 28, 2023

    Kidd_Ip 

    Thanks.  Yes I updated the connector with the new IP address.  I didn't do the original setup, so I'm not sure if there was a CA or not.  My documentation indicates I need a CA from the exchange online server, however, MS documentation indicates I need a CA from my onprem server

    • Mikeg0210's avatar
      Mikeg0210
      Copper Contributor
      Aug 02, 2023

      Mike_Garczynski 

      I needed to download M365 certs to my on prem server and delist the new IP from Microsoft.  Then is worked

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