Frequently Asked Questions

Sender authentication is the evolving way of providing a way for you to protect your reputation as an email sender.  Four major factors exist today, but new ones are being developed all the time.

• Sender-ID
  
  An email authentication technology developed by Microsoft which validates the authenticity of your domain name by verifying the IP address of the sender. This technology is based on the IETF standard: RFC4406
  
  
• SPF
  
  Sender Policy Framework is a standard for verififying the domain of the sender. It is based on RFC4408 and consists of adding an SPF or TXT field to the domain DNS, which contains the list of IPs authorised to send emails from this domain.
  
• Reverse DNS
  
  Reverse enables your IP to be "translated” into your domain. That allows the domain associated with the IP address to be found.
  
  
• DKIM
  
  DKIM This standard is described in RFC4871. AOL, Google (Gmail) work on this basis. Official website: DKIM
  

Configuring as many of these as possible in your mail system will result in fewer occurences of being tagged as a spammer, however, there is always a human element involved, and there is little you can do to help that.