How to change SMTP banner? (Exchange 2019)

Question

Hello! Please help me with a SMTP banner for Exchange 2019 - I already changed banner for 220 response but also need to change it after HELO command:

How to change server name from mail.corp.company.com to mail.company.com? Thank you for support.

Answer 1

Hi @Evgeny Shupik

Agree with the reply above from Andy, this error indicates you are modifying the default receive connector.

It is not recommended and supported to modify the Default Receive Connector Authentication mechanism and FQDN. Since this would have direct impact on the internal mail flow between your mailbox servers.

If there is any special requirement of modifying FQDN and Authentication settings, a new receive connector must be created, rather than modifying the default. (Additionally, this is also applicable for Send-Connectors)

Take a reference at the similar error here: Rename the FQDN of default receive connector

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Answer 2

The only things you can change on a custom receive connector are the SMTP banner and the FQDN of the receive connectot?

Have you done both?

https://learn.microsoft.com/en-us/powershell/module/exchange/set-receiveconnector?view=exchange-ps

Answer 3

Seems to me I changed SMTP banner only:

Tell me please how to change FQDN - need to receive a real server name (mail.company.com) in 250 response. It shows local server name at this moment.

Just dont make this change if this is the default receive connector as mentioned above.

Answer 4

Set-ReceiveConnector -Identity "Default FrontEnd MAIL"  -FQDN "mail.contoso.com"  

Prob need to restart transport service after that

Answer 5

You know - something is wrong: