A name server will no longer consider itself Authoritative if it hasn't been able to refresh the zone data in the time limit declared in this value.
MxToolBox will issue a warning if your value is less than 2 weeks or more than 4 weeks, which are suggested values.
Why you need authoritative servers
Additional Information
Each DNS host has their own interface, but you are looking for either a setting labeled Expire Value or you might have to enter your SOA details manually. If you have to enter your SOA then the Expire value will be second to last number in the SOA.
Your DNS records are hosted on two or more DNS servers that are supposed to be in regular contact with each other so that they have up to date copies of your DNSrecords. The Expire Value setting tells each slave server how long it is allowed to continue giving out authoritative replies after it has no longer heard from the master server.
RFC 1912 recommends 1209600 - 2419200 seconds (14-28 days).
How long a secondary will still treat its copy of the zone
data as valid if it can't contact the primary.This value
should be greater than how long a major outage would typically
last, and must be greater than the minimum and retry
intervals, to avoid having a secondary expire the data before
it gets a chance to get a new copy.After a zone is expired a
secondary will still continue to try to contact the primary,
but it will no longer provide nameservice for the zone.2-4
weeks are suggested values. [RFC1912]
Example SOA
@ IN SOA nameserver.example.com. postmaster.example.com. (
1; serial number
3600 ; refresh [1h]
600; retry [10m]
1209600 ; expire[14d]
3600 ) ; min TTL [1h]
Your Email Deliverability is in Jeopardy!
Blacklisting is a sign that you are not actively managing your email deliverability. Other technologies - SPF, DKIM and DMARC are now just as important to get your email placed in the Inbox of your recipients. If you aren’t managing email deliverability, your message may never be heard.
MxToolbox Delivery Center Features:
- Insight into your SPF, DKIM and DMARC configuration to ensure your sending email properly
- DMARC Compliance checks for all of your reported email
- Adaptive Blacklist Monitoring of all your email senders
- Recommendations for improving DMARC compliance and DMARC policies
- Event-based reminders for emergent issues and on-going maintenance
DMARC is a necessity for your business!
Learn More about Email Delivery