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Microsoft Azure Inbox Limits

This article outlines recommended limits, best practices, and important considerations for Microsoft Azure Inboxes

Written by plusvibe.ai Support Team

PlusVibe - Azure Inboxes

For Azure/Microsoft setups with up to 99 inboxes per domain, we recommend a safe limit of 5 campaign emails and 5 warmup emails per day per inbox, with a combined daily limit of 10 emails. These limits are intended to minimize the risk of tenant bans. However, we recommend consulting your infrastructure provider to determine the optimal sending limits for your specific setup.
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Warm-Up Phase (Days 1–14)

  • Daily Sending Volume: 5 warm-up emails per day

  • Ramp-Up Strategy: Increase volume by 1 email per day

  • Target Reply Rate: 65%–75%

  • Send Interval: Minimum 20–60 minutes between emails

  • Email Type: Natural, short, reply-friendly emails (not promotional)

⚠ Avoid links, images, attachments, and tracking pixels during warm-up.

Post Warm-Up Phase (Day 15+)

Once the inbox has completed warm-up successfully:

  • Cold Outreach: 2–5 emails per day

  • Warm-Up Maintenance: 5 warm-up emails per day (ongoing)

  • Time Gap Between Sends: 20–60 minutes

Maintaining warm-up emails even after launch helps stabilize reputation and prevent sudden drops in inbox placement.

Importance of Official Microsoft Azure Licenses

Using an official Microsoft Azure license is strongly recommended.

Why It Matters:

  • Better trust scoring at Microsoft’s server level

  • Full support for IMAP, SMTP, and OAuth

  • Reduced risk of account throttling or suspension

  • Compatibility with app passwords and secure authentication

đŸš« Avoid cracked, shared, or non-licensed inboxes — these are commonly flagged and blocked during cold outreach.

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