# Customizing delivery for large mailbox providers

To send your mail using [Velocity MTA delivery policy settings](/docs/velocity-mta-basics/creating-an-mta-delivery-policy.md) customized for prominent mailbox providers such as Gmail, Yahoo, Outlook, etc:

First, create [domain groups](/docs/advanced-postal-route-configuration/contact-list-domain-routing.md) for your postal routes, then use postal route [load balancing](/docs/advanced-postal-route-configuration/load-balancing.md). 

Alternatively, you can break large domains such as Gmail out into their own broadcasts or email funnels using a separate postal route, and create a second broadcast or funnel for the rest of your list. 

This could be accomplished by sending through separate postal routes using contact list [segments](/docs/segmenting/what-you-can-do-with-segments.md). 


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