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Please note: this account is receiving mail when I send manually to firstname.lastname@example.org but not when the autoforward is in place through Gmail. Sending from Gmail is fine - only breaks as an autoforward.
Does tmomail.net use SPF checking?
Seems like a lot of people are having this problem (including me) is it's listed on other support tickets as well. Given that this works on competitors phones (i.e. AT&T) it's probably time to forward this problem up the chain to technical engineers to see for sure what the problem is.
Lot's of people need to be immediately notified by automatically occurring events (i.e. server alerts and security systems) so it's important to get this fixed.
I work in T-Mobile Technical Care as a supervisor and have had this call several times. I have reached out to our engineering department and filed a trouble ticket for the issue for SMS -> Tmomail.net and Tmomail.net -> SMS. Our engineering department has since rectified the issue and came back with this resolution for our customer:
"Subscriber mm3 attempts were being throttled by spam clusters due to DHA and invalid recipient percentage. Customer's email email@example.com fails with bounceback with 421 final SMTP delivery failure, which is sign for overutilized connectivity. I disabled SMTP throttling and we sent 30 bulk messages, all were received. Will followup with ProofPoint on SMTP throttling settings."
Thanks for the update. For what it's worth, I was having delivery issues when trying to use tmomail.net as well. Just yesterday (7/10/2014), I was on Live Chat trying to get the issue resolved. All of the sudden, a whole bunch of SMS and MMS were delivered all at once, as-if they were queued up somewhere. Perhaps that throttling thing uncorked everything.
So far, since yesteday, tmomail seems to be reliable again. So far so good!
Many of us (in the IT community) rely on Email to SMS functionality, and expect 100% deliverability. Please permanently remove all such throttling, and/or get enough servers to handle the traffic, and/or perform close automated monitoring to tell when your throttling is failing to deliver messages. I know this feature may seems simple or unimportant, but we need it for system monitoring and alerting, etc. It's a MUST-have feature!