Article This indicates rejection due to lack of relay permission.
- For
incoming connections, relay will be allowed automatically unless
explicitly rejected through the access control list.
- For outgoing connections, relay will be allowed only if explicitly
granted by authentication or by the access control list. If
authentication is required, verify that the SMTP client is configured
to authenticate.
If you receive a "5.7.1" error message that does not mention relay
access, and sender reputation or MSISDN reputation is enabled, verify
that the SMTP client has not exceeded the reputation score threshold
for rejection.
