ERROR: 550 5.4.312 Message expired, DNS query failed(ServerFailure)

Last Modified

Thu Sep 10 14:08 GMT 2020

Description

• Inbound / Outbound Messages are bounced back with error "550 5.4.312 Message expired, DNS query failed(ServerFailure)"

Environment

• Mail Assure
  • Incoming
  • Outgoing

Solution

• There is an issue with the recipient mail server's DNS records
• When the Mail Assure servers attempted to look up the recipient mail server's DNS records, it was unable to query one or all of them (MX records, A record, etc.)
• The recipient will need to publish/update their DNS records to ensure that their email can be delivered to them.