For the last several weeks I too was having difficulty with MMS delivery by Verizon and US Cellular; this after a couple of years of trouble free performance. Nothing had changed at all in my set up.
I am using a Gmail account and sending out MMS via BCC to about 30 members of our fire department. I could see the emails in Gmail’s Sent folder, yet they were not arriving on the cell phones, or, sometimes they would arrive after a lengthy delay.
After struggling on my own I contacted Andy directly via email. He was most helpful in helping me confirm TTD was working appropriately; we agreed that I should try a Yahoo email. Tried it and it did not work at all – no delivery of MMS at all.
A few days ago I saw a your post number 3066. After reading the post I checked my IP address at Blacklist Check to see if a spam service had it Blacklisted. Turns out it was by several services.
My solution was to get new IP address from my ISP. My service, Charter, dynamically assigns IP addresses; their tech support says numbers are tough to change, even if they reprovision the modem. Tech support suggested I swap out my modem with a replacement from Charter. However, after a little tinkering I realized that a new IP address could be forced by changing my router MAC address (using DD-WRT which allows for MAC Address cloning) and rebooting the cable modem.
After getting a new IP address from the ISP I rechecked for blacklisting and none was found. For the last 3 days all MMS are being promptly transmitted and received by all 30+ members.
I hope this helps others who are having similar difficulties.
(Andy – thank you for a great program!)
Bruce