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Domain footprint: zixcorp.com
Resolved live just now — where this domain's services actually run, with each address attributed by OrgIndex. A DNS observation, not registry data: many organisations run entirely on providers' networks and hold no IP space of their own.
Web:
199.30.234.249 → Zix Corporation
Mail:
zixcorp-com.mx1.arsmtp.com → Level 3 Parent, LLC ·
zixcorp-com.mx2.arsmtp.com → Level 3 Parent, LLC
SPF sends via:
spfa.zixcorp.com · spfb.zixcorp.com
Separately, 1 organisation whose name resembles “zixcorp.com” — these may be unrelated to the domain above.