MXroute
MXroute is an email host obsessed with high IP reputation. Their offer a low-cost, no-frills solution that guarantees delivery of your corporate emails.
Codes
- 550↑
550 Unauthenticated mail not allowed from this range
The sending IP is in a range of IPs that are considered low reputation or should not be sending emails. If you believe this to be a false positive, request a review at https://whitelistrequest.mxrouting.net
550 No such recipient here
The email address does not exist. Check to make sure there are no typos or other mistakes with the address.
550 Relay not permitted
You are sending an email to a server that has not been configured to receive email for that domain.
550 Authentication Required
You are sending an email to a server that has not been configured to receive email for that domain. Read the link below for possible fixes.