The Theory

Postfix support multiple transports by lookup mapping table. I need to setup a mapping table for IP->Country->Transport lookup. Continue reading →

Sending email to all over the world, especially to China, is a big challenge. How to deliver email safely and lower the bandwidth consumption?

Here is my recipes.

QMQP:
Standard SMTP need a lot of conversations, to finish ONE email message. So, for long distance transaction, I’ll make use of QMQP (Quick Mail Queueing Protocol) which is a lot faster than standard one.

GeoIP:
To identify country, I’ll use GeoIP Continue reading →