Getting Started with Outgoing Filtering

Mail Assure's outgoing filtering solution operates independently from the incoming email filtering and is used to relay outgoing mail from your server, through Mail Assure and to the recipient.

Requirements & Limitations

Relaying through the outbound filter has some requirements for mail to be accepted:

In addition to the configuration of relay addresses and outbound authentication, the SMTP From addresses used to send mail must also be able to receive mail. If a sender address returns a failure to an inbound recipient callout, the outbound message/connection will be rejected.

Steps to Configure

Outgoing mail filtering includes several aspects that require configuration:

  1. Create the Outgoing User - Create an outgoing authentication user/method to authenticate all outgoing mail against
  2. Configure the Abuse Report Address - Set up an abuse report address to be informed every time an outgoing sender's message is rejected
  3. Set up SPF - Configure the Sender Policy Framework used to restrict which mail servers are allowed to send email for your domain name
  4. Set up DMARC - Set up the DMARC record on the DNS to choose the policy or action taken to messages that fail the DMARC check
  5. Set up DKIM - Set up a DKIM record to sign messages and help authenticate the senders as much as possible
  6. Outbound Filtering Hostnames - Configure your SMTP Hostname to use the correct ports and SPF records