Sender Policy Framework (SPF)

OpenSRS's email service is provided through two clusters, cluster A and cluster B. For both the clusters, please include _spf.hostedemail.com in the SPF record. 

v=spf1 include:_spf.hostedemail.com ~all

If you need help creating the SPF record, please refer to the SPF creation wizard.  After creating the SPF record as a TXT entry on the domain, you can validate the record here.

Email cluster A

  • All outbound email for both regular deliveries and filter-only deliveries originates from 216.40.44.0/24
  • All outbound forward and autoresponder traffic originates from 216.40.42.17 (the IP address has matching forward and reverse DNS of forward.hostedemail.com).
  • All migration traffic originates from 216.40.42.15 (fetchmail-snat.a.hostedemail.com).

Email cluster B

  • All outbound email for both regular deliveries and filter-only deliveries originates from 64.98.42.0/24.
  • All outbound forward and autoresponder traffic originates from 64.98.36.17 (the IP address has matching forward and reverse DNS of forward.b.hostedemail.com).
  • All migration traffic originates from 64.98.36.15 (fetchmail-snat.b.hostedemail.com).

Email notifications to registrants

To allow outbound email notifications from OpenSRS sent to registrants on behalf of the reseller, please include registrarmail.net in the SPF record of the domain configured as the technical email address of a reseller account. 

include:registrarmail.net

Note: While the single IP addresses above can also have /32 at the end (noting a single IP address in CIDR format), if there is no prefix-length provided with a listed IP address, /32 is assumed. As a TXT record can only be 255 characters in length, this method saves on unnecessary characters.

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1 Comments

  • Avatar
    Li Cheng
    _spf.hostedemail.com can now be used in place of the IP ranges listed for Cluster A and B above. The SPF record should look similar to the following: v=spf1 include:_spf.hostedemail.com ~all
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