Do DNS propagation delays affect real-time sending?

• Myth: DNS propagation delays cause immediate problems with email sending.
• Reality: Cached records continue working during propagation.

How caching helps:

• Old records remain valid until TTL expires
• Most receivers use cached data
• Sending continues normally

When propagation matters:

• Emergency changes needing immediate effect
• Fixing broken authentication urgently
• New sending service needing authorization

Planning strategy:

• Lower TTL before planned changes
• Make changes during low-volume periods
• Allow propagation time before relying on new records
• Propagation is usually seamless. Plan for it when timing matters.

Old schedules remain valid until they expire. New instructions phase in gradually.