Postfix กับการส่ง email ด้วยหลาย ๆ Relay

---+------------------------+

---| relay ISP

---| 202.25.25.25:25

---+------------------------+

----------^

----------|

----------|

+-------------------------+

| 202.25.25.24

| postfix

| 10.0.0.1

+------------------------+

----------|

----------|

----------v

---+-------------------------+

---| relay LOCAL

---| 10.0.0.25:25

---+-------------------------+

Normally when you need to send massive emails via shared gateway. The possibility way is to set your gateway to relay to ISP's smtp. But what happen if a huge destination emails is in local network. You have to send every local email by local relay?

Please try this

# Create a hash transport map

# touch /etc/postfix/transport

# Add this lines to /etc/postfix/transport

mydomain.com relay:10.0.0.25:25

# Create Map

#postmap /etc/postfix/transport

# Add your transportation to /etc/postfix/main.cf

# postconf -e "transport_maps = hash:/etc/postfix/transport"

# Then reload your postfix

#/etc/init.d/postfix reload