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Cold Email Mailbox Settings Checklist

A checklist of mailbox configurations to maximize cold email deliverability

From the Xiry library · Updated 11 October 2026

This list outlines key mailbox and sending configurations to prevent cold outbound campaigns from landing in spam folders. It covers technical settings, daily send thresholds, and formatting adjustments for outbound inboxes. Use it as a quick audit checklist when provisioning new sender domains and mailboxes.

The list

  1. Profile picture on every account
  2. Custom tracking domains
  3. Dedicated US-based IPs
  4. Open/click tracking OFF
  5. 10-20 cold sends per mailbox per day
  6. 20-30 warm-up sends at 60% reply rate
  7. Plain text signature only

What it's for

  • Configure new email inboxes before launching outbound outreach campaigns
  • Audit existing sender accounts experiencing low inbox placement or deliverability drops
  • Set safe warmup and daily send limits across cold email sender fleets

Key points

  • Profile picture added to every sender account
  • Setup of custom tracking domains
  • Usage of dedicated US-based IP addresses
  • Disabling open and link-click tracking pixels
  • Daily sending limits capped at 10 to 20 cold emails per inbox
  • Warmup schedules targeting 20 to 30 emails daily with a 60% reply rate
  • Signatures restricted to plain text without images or excessive HTML

Pricing

Free

Details

Type
List
Category
Marketing & Sales
Topic
Cold Email
Open source
No
Platforms
other
For
Cold emailers, sales development reps, and outbound growth marketers
Tags
cold email, deliverability, email outreach, sales ops, email warmup

Why it was saved

  • @Seannywilson, 24 March 2026: A checklist of mailbox settings the author claims make cold email campaigns reliable

Related

Updated