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Buy Outlook accounts for cold email the safe way: new Microsoft 365 mailboxes on your own domains through PureMail, a Microsoft 365 reseller, from $2.90 an inbox. We configure MX, SPF, DKIM and DMARC and connect every inbox to your sequencer.
Price comparison
Microsoft 365 Business Basic costs $7.00 a user a month on an annual plan ($5.40 without Teams; the mailbox-only Exchange Online Plan 1 is $4.00), and leaves the setup to you. Here is what the same number of cold email inboxes costs through PureMail, setup included and billed monthly.
100
You save
56%
Saved per month
$390.00
Saved per year
$4,680
| Inboxes | Retail / mo | PureMail / mo | Saved |
|---|---|---|---|
| 10 | $70.00 | $33.00$3.30 each | 53%$444 a year |
| 30 | $210.00 | $93.00$3.10 each | 56%$1,404 a year |
| 50 | $350.00 | $155.00$3.10 each | 56%$2,340 a year |
| 100 | $700.00 | $310.00$3.10 each | 56%$4,680 a year |
| 150 | $1,050.00 | $435.00$2.90 each | 59%$7,380 a year |
| 200 | $1,400.00 | $580.00$2.90 each | 59%$9,840 a year |
| 500 | $3,500.00 | $1,450.00$2.90 each | 59%$24,600 a year |
Retail is Business Basic at $7.00 a user on the annual plan ($5.40 without Teams), from Microsoft 365's own pricing page, checked October 8, 2026; see our Microsoft 365 profile. PureMail prices include setup; retail does not.
Setup
Every domain needs these records before a Microsoft 365 inbox can send cold email safely. We add them at your DNS host, switch on DKIM signing in Microsoft 365 and verify each one.
DNS records · yourdomain.com
5 of 5 verified| Type | Host | Value | Status |
|---|---|---|---|
| MX | @ | yourdomain-com.mail.protection.outlook.com (priority 0) | ✓ MX verified |
| TXT | @ | v=spf1 include:spf.protection.outlook.com -all | ✓ SPF verified |
| CNAME | selector1._domainkey | selector1-yourdomain-com._domainkey.<tenant>.onmicrosoft.com | ✓ DKIM verified |
| CNAME | selector2._domainkey | selector2-yourdomain-com._domainkey.<tenant>.onmicrosoft.com | ✓ DKIM verified |
| TXT | _dmarc | v=DMARC1; p=none; rua=mailto:[email protected] | ✓ DMARC verified |
Example values; we set the exact records for each of your domains. New to these records? Read how to set up SPF, DKIM and DMARC for cold email.
Sending limits
Microsoft publishes per-mailbox and per-tenant limits (checked October 8, 2026). New tenants are throttled for their first 60 days.
Recipients Microsoft allows per mailbox per day
10,000
30 a day is a typical cold email day per inbox: just 0.3% of what Microsoft allows.
What we recommend for cold email
Keep each Microsoft 365 inbox to 20–40 cold emails a day after a two- to three-week warm-up, with up to five inboxes per domain, and ramp slowly while the tenant is new. Sending 1,000 cold emails a day takes about 34 inboxes on 7 domains.
Work out your inboxes and domains →Messages per minute
30
Per mailbox
New tenants
10% → 25%
Of the tenant’s external-recipient cap for the first 30 days, then until day 60
Trial tenants
500 a day
External recipients
Default onmicrosoft.com domain
100 a day
External recipients per organisation; use your own domain
SMTP AUTH basic authentication
Off from Dec 2026
Sending tools must connect over OAuth
Reseller
Microsoft 365
The mailboxes and the servers that send your mail
P PureMail, the reseller
Your sequencer
Instantly, Smartlead, ReachInbox, lemlist and more, ready to warm up
A Microsoft 365 reseller sells and manages Microsoft 365 subscriptions on Microsoft’s behalf. You get the same Outlook mailboxes, sending through Microsoft’s Exchange Online servers, while the reseller handles provisioning, billing and support.
PureMail is a reseller built for outbound. We create many cold email inboxes across your domains, configure DNS and DKIM signing for each one and connect them to your sending tool, the work that takes an hour or more per tenant by hand, on monthly billing instead of an annual commitment.
Pricing
The same price for Google Workspace and Microsoft 365. Monthly billing, cancel from your dashboard, and the price per inbox drops at 30 and 101 inboxes.
Your monthly receipt
Billed monthly · USD
Total per month
$93.00
Renews monthly · cancel from your dashboard
FAQ
Straight answers about Microsoft 365 inboxes for cold email.
01
Yes. PureMail provides Microsoft 365 accounts as a reseller and sets them up for cold email on domains you own. You get real Microsoft 365 (Outlook) mailboxes that send through Microsoft's Exchange Online servers, at $3.30 to $2.90 an inbox a month, with DNS and sequencer setup included.
02
Only if they are new Microsoft 365 mailboxes on domains you own. Aged or second-hand Outlook.com accounts break Microsoft’s terms, are tied to someone else’s history and get blocked. PureMail creates fresh Microsoft 365 accounts on your domains and configures them for outbound.
03
Yes. Bought direct, Business Basic costs $7.00 a user a month ($5.40 without Teams) and Exchange Online Plan 1 costs $4.00, both on annual plans (checked October 8, 2026), and you set them up yourself. Through PureMail, Microsoft 365 inboxes cost $3.30 to $2.90 each, monthly, with setup included.
04
Each Microsoft 365 mailbox can send to 10,000 recipients a day and 30 messages a minute. The whole tenant also has an external-recipient cap based on its licence count, and new tenants get only 10% of it for the first 30 days and 25% until day 60. For cold email, stay at 20 to 40 emails a day per inbox.
05
Server smtp.office365.com, port 587, with STARTTLS (TLS 1.2 or 1.3), signing in as the mailbox you send from. SMTP AUTH has to be enabled for that mailbox, because it is off by default on tenants created since January 2020. Microsoft recommends OAuth over a password, and most sequencers connect that way.
06
Microsoft is switching off basic authentication (username and password) for SMTP AUTH by default on existing tenants at the end of December 2026, and it will not be available on tenants created after that. Sending tools need to connect over OAuth, which Instantly, Smartlead and the other major sequencers support.
07
Instantly, Smartlead, ReachInbox, lemlist, Reply.io, Snov.io and every other major sequencer connect to Microsoft 365. PureMail connects your inboxes to the tool you use as part of setup.
08
Send from the provider your prospects use. Microsoft 365 suits enterprise, finance, healthcare, manufacturing and public-sector lists, where Outlook dominates; Google Workspace suits startups and tech. Both cost the same at PureMail, so many teams split their list and run both.
Still have a question? [email protected] · contact us
Google Workspace and Microsoft 365 inboxes from $2.90 a month, set up and connected to your sequencer today.