The IPs listed here are egress traffic.
For development and preview sites, traffic will originate from one of these IP addresses.
208.124.170.242
178.128.233.75
Production, Staging and Beta
For production and staging sites, traffic will originate from one of these IP addresses.
209.217.117.82
159.203.14.67
SPF Records for Email
Tomahawk mail servers and Mailgun mail service are used for email delivery.
Tomahawk mail services are being phased out and replaced with Mailgun services.
The following is a sample TXT record from DNS.
"v=spf1 include:spf.tomahawk.ca include:mailgun.org ~all"