Hi!
The problem: I can't get my Grandstream UCM64102 VoIP router to successfully
send me automatically generated emails for errors, warnings, etc. All test emails
to date have failed.
Grandstream says that ports 109-110 have to be enabled for the UCM's email app to work.
But I can't get it to work.
I'm not at all a router or VoIP techie!! Just to make that known :-)
So please make any suggestions in real plain english with exact, detailed, instructions on how to do them! 
Thanks!
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All my devices are set to Static IP addresses in my Tomato router:
Static DHCP/ARP/IPT TomatoUSB
MAC Address Bound to IP Address IPTraffic Hostname
__:**:--:((:)):00 Enabled 192.168.1.30 Enabled ROUTER-GRANDSTREAM
(MAC address masked for security)
(192.168.1.30 is the address of my Grandstream VoIP router.)
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Here's what I set up (as best as I could) in an attempt to follow Grandstreams's instruct
to enable ports 109-110 in my Tomato router:
Port Forwarding
On Protocol Src Address Ext Ports Int Port Int Address Description
On Both 192.168.1.30 109-110 192.168.1.30 4 Grandstream RTR 2 email messag
As recommended by Grandstream, I tried "Both" as the first Protocol setting.
"Both" protocol resulted in a failed "test" email by the Grandstream UCM6102 Router:
Email Generated Time Email Send Module Receivers Last Send Time Last Send Address Send Result Return Code Options
2018-08-18 13:07:00 Test xxxxxx@gmail.com 08-18 13:07:04 xxxxxx@gmail.com deferred 534-5.7.14
Setting the Protocol to UDP also failed, but with a different Return Code:
Email Generated Time Email Send Module Receivers Last Send Time Last Send Address Send Result Return Code Options
2018-08-18 13:05:04 Test xxxxxx@gmail.com 08-18 13:05:09 xxxxxx@gmail.com deferred none
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Here are the email app settings in the Grandstream UCM6102 router:
Client
HTML
What do I need to do so that my UCM6102 can successfully send me email notifications?
I thank you in advance for studying this and giving me any advice!
Thanks!