Aerosend Alternative: Microsoft 365 Inboxes at Scale

Aerosend provides private SMTP infrastructure at $4/mailbox with isolated servers and dedicated IPs. MailDeck offers native Microsoft 365 tenants at $0.30/inbox and Private SMTP at $0.50/inbox. The core difference: Aerosend runs custom SMTP servers while MailDeck provides real Microsoft 365 accounts plus comparable SMTP infrastructure at lower cost.

We manage 650K+ Microsoft 365 and Google Workspace inboxes across 1,500+ outbound teams at MailDeck. This comparison covers pricing at every scale, infrastructure differences between private SMTP and native Microsoft 365, and where each provider fits best.

Aerosend pricing verified on aerosend.io as of April 2026.

Quick Comparison

Pricing at Every Scale

Aerosend Pricing (from their website)

Aerosend uses volume-based pricing. Each server includes 10 domains with 3 mailboxes per domain (30 mailboxes per server).

What's included:

• Private, isolated SMTP infrastructure
• Dedicated servers with aged IPs
• Managed warmup (ESP-tailored)
• Bi-weekly inbox placement tests
• 5-metric burn detection
• 24/7 monitoring + intervention
• Monthly performance reports
• 20-25 cold emails daily per mailbox

Scaling with Aerosend:

MailDeck Pricing

Microsoft 365 - Outlook Normal Licence:

• $30/tenant (100 inboxes per tenant) = $0.30/inbox
• 3-5 cold emails per inbox per day

Microsoft 365 - Outlook Premium Licence:

• $40/tenant (100 inboxes per tenant) = $0.40/inbox
• 8-10 cold emails per inbox per day

Private SMTP:

• $0.50/inbox with dedicated IP
• 250K emails/month capacity

Google Workspace:

• Start Up: $3.90/inbox (1-249 inboxes)
• Growth: $3.30/inbox (250-1,249 inboxes)
• Enterprise: $2.99/inbox (1,250+ inboxes)

Pre-Warmed Outlook:

• $50/tenant (100 inboxes) = $0.50/inbox

Diversified Stack:

• Starter: 226 inboxes for $99/month ($0.43/inbox)
• Growth: 933 inboxes for $400/month ($0.42/inbox)
• Enterprise: 9,330 inboxes for $3,500/month ($0.37/inbox)

Cost Comparison: SMTP vs SMTP

Both Aerosend and MailDeck offer private SMTP infrastructure with dedicated IPs. Here's how they compare directly.

At 300 mailboxes, Aerosend costs $1,200/month. MailDeck Private SMTP costs $150/month. Both include dedicated IPs and private infrastructure.

Cost Comparison: Microsoft 365 Option

Aerosend does not offer Microsoft 365 inboxes. If you want native Microsoft 365 infrastructure, MailDeck is the direct path.

At 300 mailboxes, Aerosend costs $1,200/month for private SMTP. MailDeck costs $90/month for native Microsoft 365 with the same inbox count.

Infrastructure Differences

Aerosend: Private SMTP with Isolated Clusters

Aerosend builds custom SMTP infrastructure for each customer. Every 10-domain batch receives dedicated servers and aged IPs. Your sending reputation is isolated from other Aerosend customers.

Key characteristics:

• Private servers per 10-domain cluster
• Aged IPs from day one
• Dynamic IP rotation for deliverability
• Premium warmup included via Warmupinbox.com integration
• Domain Burn Alerts monitoring 5 metrics
• Bi-weekly inbox placement tests

This approach gives you infrastructure isolation and managed deliverability services bundled together. The tradeoff: you're sending from custom SMTP domains rather than Microsoft or Google infrastructure.

MailDeck: Native Microsoft 365 + Private SMTP

MailDeck provisions dedicated Microsoft 365 tenants, Google Workspace accounts, and Private SMTP inboxes. Each Outlook tenant includes 100 inboxes with automated DNS configuration (SPF, DKIM, DMARC).

Microsoft 365 advantage: Your emails route through Microsoft's native infrastructure. When your recipients use Microsoft Exchange, Microsoft-to-Microsoft email receives higher trust from corporate spam filters. Based on Q1 2026 platform data, clients send 3-5 cold emails per inbox per day across domains with a minimum interval of 61 minutes between sends.

Private SMTP option: MailDeck also offers Private SMTP at $0.50/inbox with dedicated IPs and 250K emails/month capacity. This competes directly with Aerosend's infrastructure at 8x lower cost.

MailDeck's 48-hour onboarding exists because we wait for complete DNS propagation and verify authentication end-to-end before activating any inbox. For DNS configuration details, see our SPF, DKIM, DMARC setup guide.

Sending Volume Comparison

Aerosend

Aerosend recommends 20-25 cold emails daily per mailbox.

MailDeck

MailDeck sets per-inbox limits that scale with your infrastructure.

Microsoft 365:

Private SMTP:

MailDeck Private SMTP includes 250K emails/month capacity per account. Daily limits depend on your sending patterns and reputation.

Volume per Dollar

Where MailDeck Falls Short

To give you an honest comparison, here's where Aerosend has advantages:

Bundled services. Aerosend includes premium warmup via Warmupinbox.com, Domain Burn Alerts, and bi-weekly placement tests in their pricing. MailDeck does not include warmup tools. You'll need to use warmup through your sequencer (Instantly, Smartlead) or a dedicated service.

Managed deliverability. Aerosend actively monitors your infrastructure with 5-metric burn detection and 24/7 monitoring. They provide monthly performance reports. MailDeck provides infrastructure, but deliverability management is your responsibility or your sequencer's.

Where MailDeck Wins

Lower per-inbox cost. MailDeck's Outlook Normal Licence costs $0.30/inbox. Private SMTP costs $0.50/inbox. Aerosend costs $3.10-$4.00/mailbox. At 300 mailboxes, MailDeck costs $90-$150/month vs Aerosend's $1,200/month.

Native Microsoft 365 infrastructure. MailDeck provisions real Microsoft 365 tenants. Corporate spam filters trust Microsoft-to-Microsoft email more than custom SMTP. For B2B outbound targeting enterprise accounts, this infrastructure advantage matters. Aerosend does not offer Microsoft 365.

Lower minimum purchase. MailDeck's minimum is 2 Outlook tenants (200 inboxes, $60/month) or 50 SMTP inboxes ($50/month). Aerosend requires 30 mailboxes minimum at $120/month.

Provider diversity. MailDeck offers Microsoft 365, Google Workspace, and SMTP under one provider. Aerosend offers private SMTP only. If you need a mixed infrastructure stack, MailDeck's Diversified Stack bundles Outlook + SMTP + Google from $0.37/inbox. To calculate how many inboxes you need, see our inbox calculator.

Scale economics. At 600 mailboxes (20 servers), Aerosend costs $2,250/month. MailDeck Outlook Normal costs $180/month. MailDeck Private SMTP costs $300/month. The gap widens as you scale.

More inboxes per dollar. For $120/month, Aerosend provides 30 mailboxes. MailDeck provides 400 Microsoft 365 inboxes or 240 Private SMTP inboxes for the same price.

MailDeck Pricing

Outlook Normal Licence

Outlook Premium Licence

Pre-Warmed Outlook

Private SMTP

Google Workspace

Diversified Stack

All plans include automated DNS configuration (SPF, DKIM, DMARC).

FAQ

How much does Aerosend cost?

Aerosend uses volume-based pricing at $120/month per server (10 domains, 30 mailboxes), which equals $4/mailbox. Volume discounts apply as you scale: Growth tier at $105/server ($3.50/mailbox) for 101-300 domains, Scale tier at $93/server ($3.10/mailbox) for 301+ domains. Minimum purchase is 1 server (30 mailboxes).

Does Aerosend use Microsoft 365 or Google Workspace?

No. Aerosend uses private, isolated SMTP infrastructure with dedicated servers and aged IPs. They do not provide Microsoft 365 or Google Workspace accounts. MailDeck offers native Microsoft 365 tenants at $0.30/inbox, Google Workspace accounts from $2.99/inbox, and Private SMTP at $0.50/inbox with dedicated IPs.

Can I use Aerosend with Instantly or Smartlead?

Yes. Both Aerosend and MailDeck are infrastructure-only providers. Aerosend integrates with Instantly, Smartlead, and other sequencers via SMTP credentials. MailDeck provides SMTP credentials that work with Instantly, Smartlead, Saleshandy, Apollo, Lemlist, and any SMTP-compatible tool.

Which is better for enterprise B2B cold email?

For enterprise B2B recipients using Microsoft Exchange, MailDeck's native Microsoft 365 infrastructure receives higher trust from corporate spam filters. Microsoft-to-Microsoft email delivery has inherent advantages with corporate email systems. Aerosend's private SMTP performs well but lacks the native provider trust benefit for enterprise targets.

What is Aerosend's minimum purchase?

Aerosend requires a minimum of 10 domains (30 mailboxes) at $120/month. MailDeck's minimum is 2 Outlook tenants (200 inboxes, $60/month), 50 SMTP inboxes ($50/month), or 10 Google inboxes ($39/month). MailDeck has lower minimums with more inboxes included.

Does Aerosend offer Microsoft 365 inboxes?

No. Aerosend exclusively uses private SMTP infrastructure with dedicated servers and IP rotation. They position themselves as an alternative to Microsoft 365 and Google Workspace. If you need native Microsoft 365 inboxes for better enterprise deliverability, MailDeck provides dedicated Microsoft 365 tenants at $0.30/inbox with 100 inboxes per tenant.

Methodology

Data sources: MailDeck platform data (650K+ managed inboxes, 1,500+ clients). Aerosend pricing verified on aerosend.io and cross-referenced with G2, Salesforge directory, and Primeforge review as of April 2026. MailDeck pricing from published rates. Check aerosend.io for current Aerosend rates.

Last updated: April 2026

Written by Sabo Nagy

Founder & CEO

Built email infrastructure managing 650K+ inboxes for 1,500+ clients. Specializes in cold email infrastructure at scale.

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