How can DNS affect deliverability speed or reliability?

DNS affects deliverability in several ways:

Lookup speed: Slow DNS responses delay delivery as sending servers wait for lookups.

Availability: If authoritative DNS is down, receivers cannot verify authentication. Mail may defer or reject.

Timeout handling: Some receivers reject mail if DNS lookups time out during authentication checks.

Cache efficiency: Well-configured TTL reduces lookup frequency and improves reliability.

Redundancy: Multiple authoritative nameservers prevent single points of failure.

Use reliable DNS hosting with good uptime and global distribution. Test DNS response times from multiple locations.

Fast, accurate navigation charts keep ships moving. Outdated or missing charts cause delays and accidents.