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haraka-plugin-recipient-routes

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haraka-plugin-recipient-routes

Haraka plugin that validates and routes mail based on recipient domain or address


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rcpt_to.routes

Recipient Routes does recipient validation and MX routing.

Build Status Code Climate NPM

Recipient Validation

Recipients can be listed in the [routes] section of the config file config/rcpt_to.routes.ini or in Redis. If Redis is enabled and available, it is checked first. Then the config file is checked.

Entries can be email addresses or domains. If both are present, email addresses are favored.

If no route is discovered, recipient processing continues, allowing other recipient plugins to vouch for the recipient. If none does, the recipient is rejected.

  1. Redis email
  2. Redis domain
  3. File email
  4. File domain

MX Routing

NOTE: MX routing by default routes only based on domains. To route for email addresses, you must set the preference always_split=true in 'config/outbound.ini'.

Each entry in the [routes] section of config/rcpt_to.routes.ini or in Redis must specify a MX record. The MX record is the same format as outbound.js. Examples:

* hostname
* hostname:port
* ipaddress
* ipaddress:port
* { priority: 0, exchange: hostname, port: 25 }

Configuration

The following options can be specified in config/rcpt_to.routes.ini:

Redis

The [redis] section has optional settings (defaults shown):

[redis]
host=127.0.0.1
port=6379
db=0
enabled=true

Routes

The [routes] section can include routes for domains and email addresses:

[routes]
example.com=mail.example.com:225
matt@example.com=some.where.com
spam@example.com=honeybucket.where.com:26

You may also use URI format to specify SMTP vs LMTP:

[routes]
aaron@example.com=lmtp://mail.example.com:2525
matt@example.com=smtp://127.0.0.1:4242

Performance

File based

Routes from the config file are loaded into an object at server startup. If the config file changes, the routes automatically update. Key lookups in the object are extremely fast. In 2014, the author measured 450,000 qps against a 92,000 key object on a Xeon E5-2620 @ 2.10GHz.

Redis

The benchmarks published by the author(s) of the Node 'redis' module are about 30,000 qps.

Author

Matt Simerson.

Underwritten and graciously donated to the Haraka community by Serious Mumbo, Inc.

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Last updated on 29 Mar 2023

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