office 365 users can't send messages to vtext addresses

[soeffinger]

get this delivery report when trying to send text messages to vtext address from office 365

Reason: [{LED=450 4.4.317 Cannot connect to remote server [Message=421 vrz-ibgw-5002a.ext.cloudfilter.net cmsmtp too many sessions from 40.107.91.41 AUP#CNCT] [LastAttemptedServerName=vtext.com] [LastAttemptedIP=34.199.121.51:25] [DM3GCC02FT008.eop-gcc02.prod.protection.outlook.com]};{MSG=421 vrz-ibgw-5002a.ext.cloudfilter.net. OutboundProxyTargetIP: 34.199.121.51. OutboundProxyTargetHostName: vtext.com

[vzw_customer_support]

We certainly want to make sure all your texts go through, soeffinger! Are you able to receive texts? Can you send the texts to the vtext address when using your phone or the Message+ on My Verizon?-Nikki