IPv6 Outbound Pool
20 IPv6 addresses rotated per connection to distribute mail reputation across /64 subnet.
2403:bf40:13f::23 ... 2403:bf40:13f::42
IPv4 Dedicated Relay
Dedicated static IPv4 gateway for domains with missing/invalid IPv6 MX records.
45.119.82.219 (smtp-relay.hitechcloud.vn)
Smart Transport Protocol
Auto-detects IPv6 MX endpoints and signs all outbound mail with 2048-bit DKIM keys per domain.
IPv6 FirstAuto-Fallback
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