I work in the research group of one of the professors in my college. My professor keeps forwarding mails which he receives regarding some webinars/seminars being organized in college/companies or articles related to our work. However, those mails are just forwarded and don't contain any message personally written by him.
In such a situation, should I thank him for every such mail? (which I receive thrice per week) or will such frequent thank-you mails be deemed funny and spam by him? but if I don't respond in any way, I fear he will think I am ignoring his mails and may stop doing so in future. What is common practice in such situation?