Review warmup send/reply history and ESP breakdown

Below the headline metrics on a mailbox's Warm up tab, OutreachFox shows the day-by-day history of warm-up emails sent and replies received, and a breakdown of placement by receiving email service provider (ESP). Use these to confirm the ramp is running as planned and to see whether one provider is filtering you.

Prerequisites

• A mailbox with warm-up enabled for at least a day.

Steps

1. Go to Mailbox, select the mailbox and click Warm up.
2. Scroll down to view the exact history of sent emails and replies for that mailbox.

1. Scroll further to see the ESP (Email Service Provider) breakdown.

Reading the send/reply history

The history lists, per day, how many warm-up emails the mailbox sent and how many replies it received.

• Sent should rise in line with the profile's ramp (for example 5, 8, 11, 14 … up to the max). A flat line at 0 means warm-up is paused or the mailbox cannot send.
• Replies should track the profile's reply rate (30–40% of sent). Replies are the strongest positive signal; a day with sends but no replies is worth a second look.
• The first day is often partial because warm-up started mid-day.

Reading the ESP breakdown

The breakdown groups warm-up recipients by provider — Google, Microsoft, and others — and shows inbox versus spam placement for each.

• Placement is rarely uniform. A mailbox can be 98% inbox at Google and 80% at Microsoft.
• Compare the breakdown with your prospect list. If most of your leads are on Microsoft 365 and Microsoft placement is weak, fix that before launching, or route those leads to Microsoft mailboxes with Auto match leads.
• A single provider dropping while others stay high usually points to that provider's filtering (Microsoft is stricter with new domains) rather than a domain-wide problem.

Tips

• Screenshot or note the day-14 numbers as a baseline. After launch, compare weekly; a drop of more than 10 points at any ESP is your early warning.
• Use the history to confirm a profile change took effect: the next day's send count should match the new profile.
• If you enable Auto match leads in a campaign, the ESP breakdown tells you which mailbox types you need more of.

Troubleshooting

• History shows sends but health is not improving. Check the ESP breakdown; one provider may be putting everything in spam.
• Replies far below the profile's reply rate. The warm-up network replies to your mail; a low rate can mean your mailbox's inbound is broken (MX or IMAP). Send a test email to the mailbox and confirm it arrives.
• ESP breakdown empty. Not enough warm-up volume yet. Check again after 3–4 days.

Related articles

• Read the warmup health dashboard
• Troubleshooting warmup (paused, low health score, high spam placement)
• Enable Auto match ESP
• Warmup best practices: how long, how fast, and when to launch
• Inbox placement