1  # Transaction Relay Policy
 2  
 3  **Policy** (Mempool or Transaction Relay Policy) is the node's set of validation rules, in addition
 4  to consensus, enforced for unconfirmed transactions before submitting them to the mempool. These
 5  rules are local to the node and configurable, see "Node relay options" when running `-help`.
 6  Policy may include restrictions on the transaction itself, the transaction
 7  in relation to the current chain tip, and the transaction in relation to the node's mempool
 8  contents. Policy is *not* applied to transactions in blocks.
 9  
10  This documentation is not an exhaustive list of all policy rules.
11  
12  - [Mempool Design and Limits](mempool-design.md)
13  - [Mempool Replacements](mempool-replacements.md)
14  - [Packages](packages.md)
15