Hi there, I manage an email address used for both our regular client communication and sending out occasional newsletters. While our newsletter service has built-in anti-spam features, I'm worried about ending up in my clients' spam folders due to blacklisting. I know some people personally check for spam before sending, or check if IP-address so I was curious if you do this and, if so, what tools or methods you find most effective. I'm particularly interested in some online tools, but I'm open to any suggestions! Thanks for your insights!