Email bounce backs
Posted on 2014-11-14
We recently migrated to Office 365. Using Mimecast as a failover. We hit problems with DNS when 123-Reg MX record dropped. Re-instated the MX record but still getting random bounce backs from clients. Deleted cached email addresses but still getting host not found. Suspect that it is a local DNS issue. WHat is the standard TTL on DNS records for MX records.