Answer
GMS has returned an error to the remote server’s DATA command because GMS has been configured to only accept messages encrypted by the secure socket layer (SSL ) from this remote system. No communication between the remote server/client and GMS will be possible until the remote server correctly negotiates a secure connection. GMS uses the standard secure transport specified in RFC2487 to ensure compatbility with other messaging servers.
In this case, session Undefined is processing a connection from Undefined which was processing email apparently from Undefined for Undefined (if there are multiple receipts for the message, this is the first recipient). The remote server gave the SMTP command
Undefined
GMS rejected the command with
Undefined Undefined
To resolve this problem, make sure that
- GMS has the correct certificate installed;
- the remote server or client conforms t the SSL or STARTTLS standard; and
- the remote server or client is correctly configured.
See Also:
- What are the benefits of protocol level encryption?
- How do I set up Secure SMTP (STARTTLS)?
- How do I contact the owner of a client?
- Which Type of SSL Certificate should I choose?
- What is the SMTP MAIL clause?
- Can I provide secure access to email?
- How do I contact the owner of a remote server?
- What is SMTP Response Code Theory?
Keywords:secure DATA connection STARTTLS RFC2487