all major US carriers received text messages overnight that appear to have been sent around Valentine's Day 2019

Fri Nov 8 19:18:08 UTC 2019

Jared Mauch wrote on 11/8/2019 12:33 PM:
>
>> On Nov 8, 2019, at 1:26 PM, Matt Hoppes <mattlists at rivervalleyinternet.net> wrote:
>>
>> “During an internal maintenance cycle last night, 168,149 previously undelivered text messages were inadvertently sent to multiple mobile operators’ subscribers," Syniverse said in a statement.
>>
>>
>> how do you inadvertently send messages that were supposed to be sent but worked and sent? Isn’t that the desired outcome?
> I run mailing lists.  I’ve had times where I find something stuck in the system and instead of just deleting it, I actually try to make sure it goes out based on the original intent.  This has resulted in me sending out e-mails a year or two later at times.
>
> - Jared
>

Timing can be critical, which is why SMTP servers often expire and 
return queued messages after 12-72hrs (maybe a week at most). Any 
messages that can't be returned are eventually discarded and a message 
is sent to the mail server's administrator. Sounds like none of that 
actually happens within Syniverse's TXT/SMS delivery system. Someone is 
asleep at the wheel if 100-200k messages are stuck in queue for months.