Getting this error message when attempting to use the email to text feature tonight. I don't believe the sending mail server is blacklisted, I've re-created the problem with completely separate mail systems. Looks like this service may be experiencing an outage. Good luck getting in touch with anyone at Verizon to confirm...
host smtpin01.vzw.a.cloudfilter.net[34.199.121.51] refused to talk to me: 421 vrz-ibgw-5003a.ext.cloudfilter.net cmsmtp <source IP redacted> server temporarily unavailable