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

Hi there, as I mentioned above, You can't make this change to a default receive connector. You should only do this for a custom receive connector from the internet really.

Answer 3

Thank you for support!

Answer 4

Hello again! I'd like to ask a little more detail if you please - there are 5 receive connectors and only one of them (Client FrontEnd MAIL) have a correct FQDN - "mail.company.com". For another connectors this value is "mail.corp.company.com" (and not available to change). Also I already changed banner for Default FrontEnd MAIL (220 response). Is it enough to normally receive messages from any sender to domain "company.com" using Exchange server "mail"?