Founded in 2007 and based in the United States, Temp Mail is one of the earliest temporary email services, offering disposable anonymous email addresses without registration that auto-destruct after expiration to protect privacy.
Founded in 1998 and headquartered in the UK/Luxembourg, Spamhaus is the world's largest anti-spam DNSBL organization. Its ZEN composite blocklist is queried by 3+ billion mail servers daily, making it an essential spam filtering reference for email infrastructure.
AuthSMTP is a UK-based SMTP relay specialist founded in 2004, operating for over 20 years. Starting at $8.25/month with 5 GB traffic, it offers lean and reliable outbound email forwarding for users who need SMTP relay without analytics.