Private email infrastructure & deliverability engineering
northboundmail.net
NorthboundMail Systems
Est. 2011 — SMTP infrastructure & deliverability
Infrastructure

Dedicated IPs

Dedicated IPv4 allocations in multiple regions, with reverse DNS, SWIP assignment, PTR alignment and warm-up plans. Suitable for senders whose reputation must not be diluted by other tenants.

Overview

A dedicated IP is only useful if the reputation attached to it is under your control. Northbound issues IPs from address space we announce ourselves, with clean history, proper WHOIS attribution and rDNS aligned to the sending domain.

Allocations range from single IPs for low-volume transactional senders to /24 blocks for high-volume programs that need per-stream separation. Warm-up plans are calibrated to volume, vertical and content.

Benefits

  • Clean allocations from address space we operate directly
  • PTR and forward-confirmed reverse DNS aligned to the sending domain
  • SWIP attribution to the client where required
  • Warm-up curves tailored to the sending profile
  • Rotation and retirement policies documented in writing

Technical specifications

Address familyIPv4 primary; IPv6 available on request
RegionsUS, UK, NL, DE, CH, SG
Allocation sizes/32, /29, /28, /27, /26, /25, /24
rDNSClient-controlled, one PTR per IP

Use cases

  • — Marketers moving off shared IPs due to noisy neighbours
  • — Regulated senders requiring attribution transparency
  • — Multi-brand programs needing per-brand IP separation

Questions

How many IPs do I need?
It depends on daily volume, message-to-domain distribution and vertical. As a rough guide, plan on one IP per 100k-250k daily recipients for a warmed program. We size the allocation in the proposal.
What if an IP gets listed?
We monitor major blocklists continuously and remediate listings. Repeated listings from a single IP trigger a root-cause review with the client.

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