From the Email Users page, click "Add Email User." Pick the domain, enter the local part (the "sam" in sam@yourdomain.com), and confirm. Winnr provisions the mailbox and generates a strong password automatically. Total time — 5-10 seconds per mailbox. Up to 10 mailboxes per domain.
A quick note on names
Winnr uses a few words for the same thing. Email user, mailbox, and email account all mean one sending inbox on your domain (for example sam@yourdomain.com). The sidebar meter shortens it to "Emails," and Settings calls it "Email Accounts." Wherever you see any of these, it's the same object.
Naming rules
The name matters for cold-email deliverability.
Use:
- Real first names — sam@, alex@, jordan@
- First + initial — samj@, alexb@
- First + last — samchen@, alexbaker@
Avoid:
- sales@, marketing@, info@ — generic labels flag as bulk sending.
- noreply@ — obvious automated sender.
- Numbers — sam123@ looks generated.
What you get with each mailbox
- SMTP host, port, username, password (for sending)
- IMAP host, port, username, password (for reading replies)
- SPF/DKIM/DMARC alignment inherited from the domain
- Optional row in the universal inbox (if enabled in Settings)
Standard IMAP-compatible — works with any mail client, sending tool, or automation.
What's next
Step-by-step
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1. Open Email Users
App sidebar → Email Users.
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2. Click Add Email User
Dialog opens. Pick the domain (only Active domains are listed).
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3. Enter the local part
The "sam" in sam@yourdomain.com. First names beat generic labels for deliverability — sam@ works, sales@ doesn't. The Configure Users step pre-fills real-sounding names with a live address preview; edit any of them, click Randomize All to reshuffle, or Add User for more.
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4. Optionally set the display name
What shows in the From field. Blank defaults to the local part.
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5. Confirm
Mailbox provisions immediately. Password is generated and shown once — copy it now, or retrieve it later via Export or the mailbox detail panel's Reveal button.
Frequently asked questions
Can I set the password myself?
Not in the app UI — Winnr auto-generates for guaranteed strength, and you can view or rotate later. If you provision via the API or MCP server, you can pass a custom password.
How many mailboxes per domain?
10, standard cap. Going past 10 on one domain increases spam-filter suspicion.
Should I use the same local part across domains?
Yes if it makes sense — sam@domain-a.com, sam@domain-b.com, sam@domain-c.com is a standard pattern for one SDR sending from multiple domains.
What if I run out of mailbox slots?
Buy email-user credits from Settings → Subscription, or upgrade to Enterprise for 200 base mailboxes.