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How to configure incoming MX/SMTP servers

In some situations you will want 1 or more incoming smtp servers, there are some settings you can use to optimize performance in this situation:

Backend server ip address

Incoming MX server address

On the backend system ( set:

g_spam_allow "" (Version 3.0 and earlier)
g_gateway_allow "" (Version 3.1 and later)
g_spf_skip "" (Version 3.0 and earlier)
g_received_name "your.domain"

On the incoming MX server set:

g_received_name "your.domain"
g_vanish_bad_bounces "true"
g_send_max "40"
g_send_nolimit "true" (version 3.1 and later)
g_send_max_perdom "20" (Version 3.0 and earlier)