auster.no is a relay domain
@auster.no is not an actual email address.
This domain is used for privacy email addresses. These are just a way to hide your real email address.
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Where is this email from?
It's from mailgun.com, an email forwarding service.
DNS Details for auster.no
A record
194.63.248.52
MX records
Hostname
IP
auster-no.mail.protection.outlook.com
52.101.68.16
mxa.eu.mailgun.org
34.111.145.192
mxb.eu.mailgun.org
34.111.145.192