What is the Twilio SMS blacklist error ?

If you are using Workiz with Twilio as you SMS provider you might have come across an error saying that your SMS message is violating the blacklist rule.

No need to worry, there is an easy fix for this.
Simply have the person / tech you are messaging to send your Twilio number the word “START”.
Must be all in capital letters.

The reason for this is:
The Twilio API will return this message if you attempt to send an SMS or MMS to a recipient who has previously replied STOP, STOPALL, UNSUBSCRIBE, CANCEL, END, or QUIT to you. You will not be charged for the message attempt.
Read about this rule on Twilio’s blog.

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