Hosting Mamu reserves the right to block incoming email from any remote SMTP relay at any time for any reason. If a remote SMTP relay is misconfigured, spammers will often exploit the remote relay to send thousands (sometimes millions of spam). If a spammer is abusing a remote SMTP relay to mail bomb domains at Hosting Mamu, Hosting Mamu will immediately block the IP of the SMTP relay that the spammer is abusing. Hosting Mamu also subscribes to multiple RBLs (real-time blocking lists. to automatically block known open SMTP relays and known spamming relays. While this policy dramatically reduces the amount of spam sent to Hosting Mamu, this may inadvertently block some legitimate email.