POP3 and IMAP
Status: offline Clients like IMAP and POP3 uses the Client <servername> Receive -Connector. In order to allow clients to submit messages via this connector, you need to issue below command:
get-receieveconnector Client <servername> | add-adpermission -user AU -extendedrights ms-Exch-SMTP-Accept-Authoritative-Domain-Sender
RE: 550 5.7.1 Client does not have permissions to send as this sender
In adsiedit under : Configuration - Services - Microsoft Exchange -
<organization name> - Administrative Groups - Exchange Administrative Group
- Servers - <Servername> - Protocols - SMTP Receive Connectors - Client <servername>
Right click and click properties, click the security tab and grant the Authenticated users group the Accept Authoritative Domain Sender allow permission.
Other settings can be checked is as follows
We checked the settings on the Outlook and is correct. SPA is unchecked.
In Advanced we have IMAP port as 993- SSL.
In outgoing server we have "use same server as incoming server" checked.
Tested mail flow but incoming IMAP passes the test and Sending mail SMTP fails.