This is new as the past few days and rather odd.

Mail sent through the Verizon email-to-text gateway is fine during
the day when the relay is:

relay=vrz-mms.mx.a.cloudfilter.net. [52.37.233.84]

or

relay=vrz-mms.mx.a.cloudfilter.net. [35.169.108.175]

but starting somewhere around 5pm MST, mail sent to vtext.com,
vzwpix.com or mypixmessages.com is deferred:

relay=smtpin02-mms.vzw.a.cloudfilter.net. [52.33.196.155], 
dsn=4.0.0, reply=421 vrz-ibgw-6003a.ext.cloudfilter.net

Mail sent from gmail makes it through.

Sometime around 5am the following day, a resend of the mail makes
it through again, but then it's hitting one of the two other servers
listed above.

I'm not the only one seeing this:

https://community.verizon.com/t5/Verizon-Messages/Vtext-messages-Severe-Delay/td-p/1240767/page/7

Going the other way, text-to-email seems to work fine and it arrives from 
(in one test) twbgohaavzwvcmta-c-nk-x-00-sms-02.vtext.com [63.55.64.200] 
after first going through m04.vzwpix.com (unknown [63.59.66.15])

If anyone from Verizon or cloudfilter.net is listening, please
advise.

Cheers,
Zube
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