How to change Exchange Mailbox SMTP Port

 

1. In the EAC, go to Mail flow > Receive connectors.

2. In the list of Receive connectors, select Client Frontend <Server name>, and then click Edit ().

3. In the Exchange Receive Connector page that opens, click Scoping.

4. In the FQDN field, enter the SMTP server FQDN that you want to use for authenticated SMTP client connections (for example, mail.contoso.com) and then click Save.