Sender Policy Framework (SPF)

Sender Policy Framework (SPF) is a technical standard and email authentication technique that helps protect email senders and recipients from spam, spoofing, and phishing. Specifically, it defines a way to validate that an email message was sent from an authorized mail server in order to detect forgery and to prevent spam.

SPF record

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

As of June 8th, 2021, cluster A will use the following new IPs in addition to the existing ones.

   Existing IPs 

Updated IPs

All outbound email for both regular deliveries and filter-only deliveries originates from 216.40.44.0/24

 64.99.140.1/24

 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).

 64.99.140.10/32

 216.40.42.17

All migration traffic originates from 216.40.42.15 (fetchmail-snat.a.hostedemail.com).

 64.99.140.16/29

 216.40.42.15

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Email cluster B

  IP address
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
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2 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
  • Avatar
    Tugboat Group

    Hello,
    We have the following ip configured on all domains DNS MX A record: 216.40.42.4
    It is not clear to me to which ip address to migrate.
    We are on cluster A as far as I know.

    I'll appreciate your help.

    Thanks.

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