OK. First, I really don’t like receiving spam texts. That said, sometimes there’s a good reason to do this for internal company contacts. if you have everyone’s text “email address” you could do it as a mail merge from Outlook or Gmail using YAMM or another add-in. Get rid of the signature if one is defaulted and use plain text. https://www.dialmycalls.com/blog/send-text-messages-email-address.