There are several tools available to check and monitor your sender reputation. Some popular options include:
Sender Score: A free tool provided by Return Path that gives you a score between 0 and 100 based on your sending practices. Google Postmaster Tools: Offers insights into your email performance specifically for Gmail users. Microsoft SNDS: Provides data on your sending reputation for Outlook.com, Hotmail, MSN, and Live.com users. MXToolbox: Allows you to check if your domain or IP address is blacklisted.