Setting up cold outreach mailboxes is a core part of managing your domains in Icemail. Whether you're adding a few mailboxes or uploading them in bulk for scale, this guide will walk you through both single and bulk creation workflows.
Before You Begin
Make sure:
You have already connected your domain(s) to Icemail.
You know which mailbox type you need â use the [Icemail Mailbox Calculator](https://icemail.ai/cold-email-mailbox-calculator) to estimate how many mailboxes and domains you'll need based on your sending goals.
- Google Workspace â Licensed Google Business Starter (Icemail is an official Google Partner). US IP mailboxes. $2.50/mailbox/month. Recommended: 2â3 mailboxes per domain. - Microsoft 365 â Microsoft 365 Business Starter plan. US IP mailboxes. $2.50/mailbox/month. Recommended: 2â3 mailboxes per domain. - SMTP â Dedicated IP per domain. Up to 10 mailboxes per domain. 50 emails/day/mailbox. - Azure â 100 mailboxes per domain. $30/domain/month. Up to 10 emails/day/mailbox (5 cold + 5 warm).
Creating a Single Mailbox in Icemail
Follow these steps to create and assign a single mailbox:
Step 1: Navigate to the Mailbox Dashboard
Log in to your Icemail account
From the left-hand menu, click on âMailboxes.â
Step 2: Click on âAssign Mailboxâ
This button allows you to manually create and link a mailbox to a domain.
Step 3: Fill Out the Mailbox Details
Enter the following:
- Email address (e.g., jane@yourdomain.com) - Domain to associate the mailbox with - Password (if youâre creating mailboxes directly through Icemail) - Optional Tags for grouping (e.g., SDR1, Campaign A)
Note: Ensure all fields are accurate. Typos can cause login issues and domain conflicts.
>
Step 4: Click âAssign Mailboxâ
The mailbox will be created and linked to your selected domain.
Creating Multiple Mailboxes (Bulk Upload)
For scaling your campaigns, bulk mailbox creation is the most efficient option.
Step 1: Click on âUpload Bulk CSVâ
In the Mailboxes section, youâll find the Bulk Upload option. Click it to begin.
Step 2: Download the Sample CSV
Click âDownload Sample CSVâ to understand the exact structure required.
The sample file includes fields like:
- Email - Domain - Password - Tag (optional)
Step 3: Prepare Your CSV File
Fill in your mailbox data following the format exactly.
Double-check for typos and make sure all domains listed are already connected in Icemail.
Step 4: Upload the CSV & Click âAssign Mailboxesâ
Once your file is ready, upload it and hit âAssign Mailboxes.â
Icemail will automatically generate and assign all listed mailboxes to their respective domains.
Mailboxes will now appear in your dashboard, ready to be used for warmup or cold outreach.
Pro Tips
Use tags to organize mailboxes by campaign, SDR, or region.
Enable auto warmup after mailbox creation to improve deliverability.
If you're using third-party services (like Google or Microsoft), complete manual login after mailbox setup for proper verification.
đ§ Sending Recommendations
For best deliverability, follow these guidelines per mailbox per day:
| Mailbox Type | Cold Emails/Day | Warmup Emails/Day | Ratio | | --- | --- | --- | --- | | Google Workspace | 15 | 15 | 1:1 | | Microsoft 365 | 15 | 15 | 1:1 | | SMTP | 15 | 15 | 1:1 | | Azure | 5 | 5 | 1:1 |
Parallel warmup is always recommended alongside outreach. Run warmup and cold outreach simultaneously in equal portions.
Related Articles
Need Help?
Need assistance with mailbox setup or CSV formatting? Reach out to our team â weâre here to help.
Email: **team@icemail.ai** Your data is always safe and encrypted.