# Domain Warming

### We're now warming up your domains automatically for the best deliverability.

Dec 7, 2025

We've added automatic domain warming to protect your email deliverability. When you connect a custom domain or start using our platform, we gradually increase your sending volume to build sender reputation with email providers.

The system automatically routes emails between domains during warm-up to ensure nothing gets dropped. No configuration needed. It just works in the background to keep your emails landing in inboxes, not spam folders.

## Recent updates

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**Campaign scheduling**\
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Feb 11, 2026](https://letterby.com/explore/campaign-scheduling) \
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**Email Verification**\
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Dec 2, 2025](https://letterby.com/explore/email-verification) \
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**Zapier integration v2**\
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Nov 26, 2025](https://letterby.com/explore/zapier-integration-v2)