Kenwood TH-D72A/E - Manual (Page 64)

7 APRS NETWORKS
56 CONTENTS TH-D72A/E
Figure 7-4 Transmission Flow for Email
Note:

You cannot send email from a personal computer to a mobile station.
 Just like other APRS packets, the content of the email you sent can be monitored by other stations
 2-byte codes cannot be sent.
 In case the Email Server is down, Email is not delivered.
Internet
APRS Server
TM-D710A/E
APRS software
Email software
From IGate to Server
Server to Internet
Digipeater
Email transmission
Email has been received!