Reverse DNS Blacklisting
Every email is checked against a database of blacklisted mail servers. When an email is sent from a blacklisted server, it's treated as Spam and rejected before it has a chance to clutter your mailbox.
Every email is checked against a database of blacklisted mail servers. When an email is sent from a blacklisted server, it's treated as Spam and rejected before it has a chance to clutter your mailbox.