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Yes, we check SPF (Sender Policy Framework) DNS records before a message is accepted.
Messages that pass the SPF check, or messages that “soft fail” the SPF check (i.e. no SPF DNS record for the domain exists) will be delivered.
Messages that “hard fail” the SPF check (i.e. are sent from e-mail servers not specified in their SPF record) will be rejected before they can enter Rhombic Networks’ mail processing queue, reducing the amount of spam our users get.
Rhombic Networks uses the following fairly conservative RBLs when checking incoming messages:
Our anti-spam countermeasures can be divided into two types: pre-acceptance and post-acceptance. Pre-acceptance methods are used before our systems accept an e-mail—if the check fails, you do not receive the e-mail. Post-acceptance methods are used after a system accepts an e-mail—if the check fails, it will be marked as spam and placed into your inbox’s “Spam” folder.
The pre-acceptance methods we use include:
For post-acceptance spam filtering, we use SpamAssassin and Bogofilter.
If you are only forwarding mail to an e-mail account hosted elsewhere from Rhombic Networks, e-mail will only go through pre-acceptance checks. If your mail arrives to a Rhombic Networks-hosted Inbox, it will also go through post-acceptance checking.
