Conclusions:
- Emails will bounce with far less than ten recipients per message
- Sending from gmail via the web interface seems to work ok
- Sending from gmail using a local email client (TTD, Thuderbird, etc.) appears to bounce
- Sending from a non-gmail (twotonedetect.net) account with TTD seems to work ok, at least for up to 3 Verizon users
Andy
Before I continue this conversation Andy I must give you major props for testing through all of that. That took dedication and I thank you for it. Testing is often underappreciated but this answers a fair bit.
The outcome, unfortunately, is less than ideal. Must be the fact that we are sending THROUGH gmail that they don't like. This leaves us with 4 choices.
1) Figure out a way to get around the block using some trickery or web scripting.
2) Work with Verizon to implement a solution. Enterprise messaging somehow?
3) Use alternate delivery methods. Upload files to a server then send a link to the sound that can be listened to.
4) Abandon sending MMS messages to Verizon users and hope that a plain text message alerts them to something. IF the vtext portal still works.
I have built a few tools that can upload the specified file (usually MP3) to a server then use Pushover to send out a link. You can easily click the link but that requires data for the device. Older, plain phone, users would be left out. I have also started looking into Twilio as they can send MMS. Problem is Twilio is 2cents per message per user. That adds up quickly.
Guess we press on looking for a solution or workaround. The most obvious is to switch from gmail to something else.