I'm trying to allow the authenticated relay (Client Frontend connector) to process requests from LAN and internet, but I'm struggling so far.
First, I have linked this connector to my SSL wildcard certificate (so far so good, openssl starttls on 587 OK)
Then, when I execute an SMTP diag on port 587 from the LAN with a mailbox account, I get :
Error: SMTP protocol error. 504 5.7.4 Unrecognized authentication type.
Failed to send message
So, I disabled "offer basic authentication only after starting tls" in the ECP, and it's working a little better, but I'm not OK with that because, I want the connections from the internet to be secured.
Furthermore, It still doesn't work because now, I get the following message :
Error: SMTP protocol error. 550 5.7.60 SMTP; Client does not have permissions to send as this sender.
Failed to send message
I'm using the same email in the from field as the one from the mailbox account I'm filling the credentials in.
Any help appreciated, regards