Do I need dedicated IPs for cold email?

Not necessarily. Teams sending under 50,000 emails a month can do well on shared IPs with solid warmup practices through Sendbox. Once you're past that volume, dedicated IPs start providing meaningful reputation protection.

Can I start with Maildoso and switch to dedicated IPs later?

Not directly — Maildoso has no dedicated-IP product of its own. Moving to dedicated IPs means switching to Infraforge or InboxKit. InboxKit provides Google Workspace mailboxes on US-based IPs across three tiers (Professional $31, Agency $81, Enterprise $250 for the corresponding 10/30/100 mailbox slots), and it comes out cheaper than the equivalent Infraforge setup once you factor in Infraforge's IP fee and domain masking.

Do both work with Sendbox?

Yes, both connect into Sendbox for AI warmup, sequencing, and deliverability monitoring.

Maildoso vs Infraforge: What You Actually Pay

A comparison of Maildoso and Infraforge on price, shared versus dedicated IPs, and features, to help you decide which fits your cold email setup.

By Ritesh Chauhan

3 min readUpdated Mar 2026

The Verdict

Maildoso has the cheapest mailboxes in this pairing, starting at $1.90/mo on shared IPs. Infraforge charges $3-$4/mo for dedicated-IP SMTP, plus a $99/mo fee for the IP itself. Pick Maildoso if budget efficiency is the priority; pick Infraforge if sender isolation is.

Worth a look as a third option: InboxKit's tiered plans (Professional $31 for 10 slots, Agency $81 for 30, Enterprise $250 for 100) pair Google Workspace with bundled deliverability tooling.

Maildoso vs Infraforge

Feature	Maildoso	Infraforge
Pricing
Price per Mailbox	$1.90-$2.50/mo SMTP starts at $1.90; the Combo option runs $2-$3.	$3-$4/mo SMTP mailboxes on dedicated IP infrastructure.
Dedicated IP Cost	Not available No dedicated IP option exists.	$99/mo The dedicated IP is a $99/mo add-on.
Cost for 100 Mailboxes	$190-$250/mo 100 mailboxes at $1.90-$2.50 each, no fees on top.	$350-$499/mo 100 mailboxes averaging $3.50 each, plus the $99 IP fee.
Infrastructure
IP Infrastructure	Shared IPs Runs on shared IP pools.	Dedicated IPs Dedicated IPs, billed at $99/mo extra.
Multi IP Provisioning	No Not offered on a shared-IP setup.	Yes You can provision multiple dedicated IPs.
Deliverability
Pre-warmed Domains	No Warmup needs to come from your sending tool.	Yes Domains arrive pre-warmed.
Scale
Scale Track Record	400K+ mailboxes 400K+ mailboxes managed, 10M+ emails sent daily.	Part of Salesforge Scale figures come from the wider Salesforge ecosystem.
Social Proof
G2 Rating	4.7 (159 reviews) Backed by verified G2 reviews.	Not listed No G2 rating of its own.
Automation
API Access	API + MCP Full API access plus MCP protocol support.	Yes API access is available.

Shared vs Dedicated IPs

At its core, this comparison comes down to shared versus dedicated IP infrastructure. Maildoso mailboxes send from IPs shared with other Maildoso customers, while Infraforge gives you IPs that belong exclusively to you. Shared IPs work fine for plenty of cold email teams, particularly ones pairing them with solid warmup and sending discipline through Sendbox.

The risk is that another sender sharing your IP pool can drag down the shared reputation. Dedicated IPs remove that risk entirely, but at a meaningfully higher price. For teams sending under 50,000 emails a month, shared IPs with proper warmup are usually enough.

Past that volume, dedicated IPs start to matter more for protecting deliverability.

Key takeaways

Maildoso: shared IPs, workable for most teams under 50K emails/mo
Infraforge: dedicated IPs, worth it for high-volume senders
Dedicated IPs remove the risk that other senders on your pool pose
Both pair well with Sendbox's AI warmup and monitoring

Cost Comparison

The cost gap between them is substantial. At 100 mailboxes, Maildoso runs $190 to $250/mo. Infraforge runs roughly $350 to $400 for the mailboxes plus $99 for the dedicated IP, totaling $449 to $499/mo — close to double.

For teams that want Google Workspace or Microsoft 365 mailboxes with deliverability tooling bundled in, InboxKit's Enterprise tier offers 100 mailbox slots at $250/mo (an effective $2.50 per mailbox), with US-based IPs and the verifier, placement testing, and blacklist checker all included. Email Warmup remains a separate $3/mailbox add-on if you want it.

Key takeaways

At 100 mailboxes: Maildoso ~$220/mo against Infraforge's ~$450/mo
The dedicated IP add-on roughly doubles Infraforge's bill
InboxKit sits in between: $250/mo with dedicated IPs and GWS included

Maildoso vs Infraforge: Which One Fits Your Use Case

Go with Maildoso if the cheapest infrastructure is the goal and shared IPs don't worry you. Pairing it with Sendbox for warmup and monitoring helps offset the shared-IP risk. Go with Infraforge if you need dedicated IP isolation for high-volume campaigns or sensitive domains — the extra spend buys genuine reputation protection.

InboxKit is worth weighing as a third path: tiered pricing (Professional $31 for 10 mailboxes, Agency $81 for 30, Enterprise $250 for 100), US-based IPs, and Google Workspace or Microsoft 365 mailboxes. It undercuts Infraforge at every comparable tier and bundles in more than Maildoso does (verifier, placement testing, and blacklist checker included; warmup is a $3/mailbox add-on).

Key takeaways

Maildoso: cheapest path, shared IPs, pair with Sendbox for warmup
Infraforge: dedicated IPs for high-volume sender isolation
InboxKit: best value if you want dedicated IPs plus deliverability tooling

Pros & Cons

Maildoso

Strengths

Cheapest per-mailbox pricing, starting at $1.90/mo
400K+ mailboxes managed, a genuine scale record
4.7-star G2 rating from 159 verified reviews
API and MCP support for automation
A Google Workspace Combo tier is available

Limitations

Runs on shared IPs only
No dedicated IP option on offer
Domains aren't pre-warmed
No native deliverability tooling

Infraforge

Strengths

Dedicated IPs deliver genuine sender isolation
Domains arrive pre-warmed for a faster ramp
Supports multi-IP provisioning
API access plus a masterbox console
A natural upgrade path from Mailforge

Limitations

Notably more expensive at scale
The dedicated IP adds $99/mo on its own
SSL and domain masking cost another $2 per domain
SMTP-only, with no Google Workspace
No native deliverability tooling

Keep reading

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Yes, considerably so. Maildoso starts at $1.90/mailbox with no extra fees, while Infraforge starts at $3/mailbox plus $99/mo for the dedicated IP. At 100 mailboxes, that's roughly $220/mo on Maildoso versus $450/mo on Infraforge.

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