vtext working very intermittently

I am having issues sending texts via email either not being delivered or very delayed.  This is service that had been working.  The emails are forwarded by sendingrid , I have a verified domain, a verified sender.  I send out 15 emails individually at a time.  some, one , none receive the messages.  [email address removed per the Verizon Terms of Service]

the following error is returned:

552 5.2.0 is listed on Cloudmark CSI-Global. Please visit https://csi.cloudmark.com/en/reset?ip= AUP#BL

It appears the spam filter is randomly blocking the texts.

This has been a very valuable service and needs to be corrected.

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