Maildoso vs. Cold Email Agency (2026 Pricing Compared)

Maildoso sells pre-warmed sending domains and Google Workspace mailboxes for cold email, priced from $0.49 to $2.50 per mailbox a month. It is infrastructure, not an outbound team. A cold email agency builds the list, writes the copy, runs the sequences, and triages replies. Pick Maildoso if you already have those pieces in place and just need inboxes that land.

What does Maildoso actually do?

Maildoso provisions and maintains the sending layer of a cold email campaign: domains, Google Workspace mailboxes, SPF/DKIM/DMARC records, and warmup. That is the entire product. Per Maildoso's homepage, mailboxes come with self-healing replacement when one gets burned, IP rotation, CAPTCHA domain protection, and inbox placement testing roughly every 3 days.

Mailboxes plug into sending tools you already run, like Instantly, Smartlead, or Saleshandy, through one-click connections or CSV export. Maildoso also offers an API and MCP server so a technical team can spin up domains and mailboxes programmatically instead of clicking through a dashboard. None of that touches who you send to or what you say. See our domain warmup guide for what happens after the mailboxes are live.

What does Maildoso cost in 2026?

Per Maildoso's pricing page, monthly plans run from $75/month for 30 mailboxes up to $499/month for 1,000 mailboxes, with per-mailbox cost dropping as volume climbs. Domain registration is a flat $12/year. There is no free trial, but new monthly subscribers get a 30-day money-back guarantee.

That price covers infrastructure only. A cold email agency's fee covers infrastructure plus the list, the copy, the sending, and the follow-up, which is why agency pricing is priced as a retainer or a charge per booked meeting rather than a per-mailbox rate.

What Maildoso doesn't do

Maildoso is explicit that it is a mailbox and domain provider, not a full-service outbound shop. It does not build your prospect list. It does not write your sequences. It does not send or schedule campaigns beyond the sequencer integration. It does not triage replies or book meetings. It does not set your ICP or targeting strategy.

Every one of those gaps has to be filled by someone on your team or by another vendor. Teams that skip list building often end up sending clean emails to the wrong accounts, which is a targeting problem no amount of mailbox infrastructure fixes. Our list building guide covers what a good list looks like before it ever reaches a Maildoso mailbox.

When should you pick Maildoso vs. a cold email agency?

Pick Maildoso when you have an internal marketer or SDR who already knows how to write copy, build lists, and run a sequencer, and the only thing missing is a reliable supply of warmed mailboxes. At $0.49 to $2.50 per mailbox, it is cheap relative to hiring, and the self-healing and IP rotation features solve a real deliverability headache for teams sending at volume.

Pick a cold email agency when you don't have the time, the in-house skill, or the appetite to run list building, copywriting, sending, and reply management yourself. Modern Inbound has delivered 6,000+ warm leads running that full stack for clients, and the mailbox layer Maildoso sells is one small piece of what that takes. If you're evaluating agencies generally, our guide to picking a cold email agency lays out the questions worth asking before you sign.

FAQ

Is Maildoso a cold email agency?

No. Maildoso is an infrastructure provider. It sells pre-warmed domains and mailboxes and handles deliverability upkeep, but it does not build lists, write copy, run campaigns, or manage replies. Those tasks stay with you or with a separate agency.

How much does Maildoso cost per month in 2026?

Per Maildoso's pricing page, monthly plans start at $75/month for 30 mailboxes ($2.50 each) and scale down to $0.49 per mailbox at 1,000 mailboxes ($499/month). Domain registration is a separate $12/year charge.

Can I use Maildoso and a cold email agency together?

Yes. Many agencies provision mailboxes through infrastructure vendors like Maildoso as part of a managed campaign, then handle list building, copy, sending, and replies on top. The two aren't mutually exclusive, one is a supplier and the other is the operator.

What does a cold email agency charge instead of a per-mailbox fee?

Cold email agencies are typically priced as a retainer or a charge per booked meeting, rather than by mailbox count. That price bundles infrastructure with strategy, list building, copywriting, sending, and lead delivery, which is why it isn't directly comparable to Maildoso's per-mailbox rate.

If you'd rather not manage domains, mailboxes, lists, copy, and replies as four separate vendor relationships, that's the gap Modern Inbound fills. See our setup page for how the execution layer works, or get in touch to talk through your specific setup.

By Rishabh Ambasta, Founder, Modern Inbound.