There are two standards to check the sender's identity: SPF and DKIM. RealSender provides both of them.

SPF declares which are the authorized smtp servers for a certain domain. DKIM digitally signs each message sent from a certain domain and its related smtp server. All the informations used to check the messages, are saved and locked within the domain DNS settings.

RealSender provides
"secure smtp with email authentication":

> secure smtp <

• the server accepts only messages sent with SMTP authenticated over secure connection using TLS or SSL (the communications are encrypted using a dedicated digital certificate)
• the server accepts only the sending of messages from senders that have been configured and authorized
  

  > email authentication <

• all messages sent through the server are authenticated using the standard protocols: SPF + Sender ID, DKIM + Domain Keys
  

  > additional protection <

• each customer has a dedicated IP address
• the IP address is monitored daily over 75+ blacklists

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