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Domain footprint: suddenlinkmail.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.
Mail:
mx.altice.prod.cloud.openwave.ai → Openwave Messaging US Inc
SPF sends via:
suddenlink.net
Separately, 1 organisation whose name resembles “suddenlinkmail.com” — these may be unrelated to the domain above.