What is DNS propagation

Key points

• DNS changes spread across the internet gradually
• Usually minutes to a few hours
• TTL controls how fast changes propagate
• Your old provider keeps mail until MX updates everywhere

How to do it

1. Lower TTL before switching if possible
2. Make the MX change
3. Wait for propagation
4. Verify from multiple networks

Common mistakes

• Expecting instant switchover
• Panicking during normal propagation
• Not planning overlap with old provider