Smartlead Warm-Up Settings

Integrations

Key takeaway: Azure and Google need different warm-up settings. And in Smartlead there is one setting you must switch off, or it will scale your inboxes into a provider block on its own.

These are the exact numbers we run on Frostmailer inboxes in Smartlead. Turn warm-up on per account by clicking the flame icon, then match the block below to the mailboxes you bought.

Microsoft Azure, per inbox

Days 1 to 14: 5 warm-up emails per day, increasing by 1 per day. Target reply rate 65 percent.

Day 15 onwards: 2 cold emails per day, warm-up maintenance at 5 daily, 60 to 80 minutes between sends, hold 65 percent reply rate.

Azure is a breadth play. Volume per inbox stays deliberately low and you scale by adding inboxes and domains, never by pushing these numbers up.

Google Workspace, per inbox

Sending limit: 15 emails per day. Warm-up limit: 20 emails per day, increasing by 2 per day.

Reply rate: 35 percent. Spacing: 20 minutes between sends.

Google tolerates far more per inbox than Azure, which is what the higher per-inbox price buys. Never apply these numbers to an Azure tenant.

The setting that gets accounts blocked

Disable "Enable Auto-Adjust Warmup/Sending Ratio". This is not optional. Left on, Smartlead scales an inbox up to 100 emails a day by itself, which triggers provider blocks. It is the single most common reason a Smartlead account dies on infrastructure that was otherwise healthy.

Two more things worth setting

Set a custom warmup identifier tag so warm-up mail filters cleanly out of the inbox and never gets confused with real replies.

Keep daily sending patterns regular. Burst sending, several hundred emails inside an hour, reads as automation to every provider worth landing in.

Want this done for you?

Our Build and Release service stands up your entire cold email infrastructure: domains, mailboxes, authentication, warm-up, and tracking, all authenticated and ready to send. You skip the weeks of setup and start with campaigns.

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