Is it illegal to text someone to look for your missing husband?

No offense. According to information from the Civil Code, in the process of publishing a missing person notice, if it is a well-intentioned missing person notice and the content does not infringe his legitimate rights and interests, it is not illegal. Sending text messages to others to search for the missing husband is a A well-intentioned missing person notice that does not infringe the rights of others is not illegal and is a normal and legal act of publishing a missing person notice.