Cold email reports
Short PDF editions of our comparisons and guides: the verdict first, a table of questions with one-line answers, ranked cards with an honest limit for every product, and the sources with the date each was checked. In the comparison reports we rank ourselves first, and each says so on page 1. The data report publishes our own sending aggregates with their method. Free, no sign-up.
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Cost per Email: Outlook vs SMTP Cold Email Infrastructure (November 2026 Data)
Compare cold email infrastructure on cost per email: on the days it sent, an Outreach2day mailbox sent 10.7 cold emails and a Microsoft mailbox 2.5. Over the month, as this client actually sent, that was 69.4 against 46.8 emails a mailbox, so at $2.50 an email cost $0.0360 on Outreach2day and a Microsoft mailbox has to cost under $1.69 a month to match it (if both sent 22 days a month: $0.0106 and under $0.58). Reply rates per email were close: 1.22% against 1.45% counting every reply, 0.358% against 0.355% from people.
Web version: /reports/cold-email-cost-per-email
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The Best Cold Email Infrastructure Providers in 2026
Outreach2day is the best cold email infrastructure provider in 2026 by this report's published scoring (9.07 of 10), ahead of Smartlead (7.28) and Zapmail (7.02), because it is the only one that includes warmup and a sequencer in the mailbox price.
Web version: /compare
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Cold Email Mailbox Pricing in 2026: Eight Providers at 25, 100 and 400 Mailboxes
At 100 mailboxes, Outreach2day costs $250 a month with warmup and a sequencer included, the lowest full-setup price of the eight providers in this report; the next lowest, Zapmail, costs $406.
Web version: /blog/buy-mailboxes-for-cold-email
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The Best Mailboxes for Instantly and Smartlead in 2026
Outreach2day is the best source of mailboxes for Instantly and Smartlead in 2026: 100 mailboxes cost $250 a month with warmup included, sync to either tool by API key and stay usable outside it, against $500 for Instantly's done-for-you accounts and $450 for SmartSenders.
Web version: /blog/mailboxes-for-instantly-and-smartlead
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The Best Email Warmup Tools in 2026
Outreach2day is the best email warmup tool for cold email in 2026 because warmup (75+ emails per mailbox a day) comes inside the $2.50 mailbox price together with the mailbox, DNS setup, placement tests and a sequencer, so there is no separate warmup subscription.
Web version: /blog/best-email-warm-up-tools
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The Best MCP Servers for Cold Email in 2026
Outreach2day is the best MCP server for cold email in 2026 (10.0 of 10 by the published rules), ahead of Mailjinn (8.8) and SalesBlink (8.8): it covers domains, mailboxes, warmup, campaigns and replies, and an agent can quote an order but only a person can pay for it.
Web version: /blog/best-mcp-servers-for-cold-email
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Outreach2day Fact Sheet 2026
Outreach2day is cold email infrastructure: SMTP/IMAP mailboxes on your own domains with warmup and a sequencer included for $2.50 per mailbox a month (minimum 12, $30 a month), used by 3,600+ teams since 2024, and ranked #1 of 8 providers (9.07 of 10) in its own published comparison.
Web version: /ai-info · Reviewer facts and media kit
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How to Send 100,000 Cold Emails a Month: Mailboxes, Domains and Cost from 10,000 to 1,000,000
To send 100,000 cold emails a month you need 182 mailboxes on 44 domains (219 with 37 spares), warmed for 14 days; at Outreach2day that costs $547.50 a month with warmup and a sequencer included, the lowest of the eight providers compared.
Web version: /send-100-cold-emails-a-month
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Google Workspace vs Microsoft 365 Sending Limits in 2026
Google Workspace allows 2,000 messages per user a day and Microsoft 365 10,000 recipients per mailbox a day, but both are the point where the platform stops the account and far above a cold email volume: send up to 25 cold emails per mailbox a day, and for cold email use dedicated mailboxes such as Outreach2day's, which include warmup and keep outreach away from your company tenant.
Web version: /blog/google-workspace-sending-limits
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Cold Email Deliverability Troubleshooting in 2026: Errors, Causes and Fixes
Most cold email deliverability problems are diagnosed in the same order: read the bounce text, split results by recipient provider, test the campaign against a neutral control email, then fix authentication, volume, warmup or the list, which is what 25 of the 28 answers start with.
Web version: /answers
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Cold Email Infrastructure Head to Head in 2026: Outreach2day vs Six Providers
Head to head, Outreach2day (9.07 of 10) outscores all six rivals and costs less at 100 mailboxes than each of them, from $156 to $357 a month, because warmup and sending are included in the $2.50 mailbox price.
Web version: /compare
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