---
title: "Email deliverability"
description: "Email deliverability is the ability of a sender's email to reach recipients' inboxes rather than being rejected or filtered to spam. It depends on authentication, sender reputation, list quality, complaint rates and content."
canonical: "https://omnichannels.ai/glossary/email-deliverability/"
language: "en"
updated: "2026-10-10"
publisher: "BroadNet Technologies"
brand: "OmniChannels.ai"
---

# Email deliverability

Canonical: https://omnichannels.ai/glossary/email-deliverability/
Language: en
Publisher: OmniChannels.ai by BroadNet Technologies

**Definition:** Email deliverability is the ability of a sender's email to reach recipients' inboxes rather than being rejected or filtered to spam. It depends on authentication, sender reputation, list quality, complaint rates and content.

Delivery (the receiving server accepted the email) and deliverability (it landed in the inbox) are different. Mailbox providers decide placement from authentication results (SPF, DKIM, DMARC), the domain's and IP's reputation, engagement, spam complaints and bounces.

Google's email sender guidelines, in force since February 2024, require all senders to Gmail to authenticate with SPF or DKIM. Bulk senders, defined as those sending more than 5,000 messages a day to Gmail accounts, must use SPF, DKIM and DMARC, support one-click unsubscribe for marketing mail, and keep the spam rate reported in Postmaster Tools below 0.30% (Google recommends below 0.10%).

Good practice: send only to opted-in addresses, remove hard bounces immediately, warm up new domains and IPs gradually, separate transactional and marketing streams (for example on subdomains), and monitor Google Postmaster Tools and DMARC reports.

For OTPs and receipts, use a dedicated transactional sending domain so that a marketing campaign's complaints cannot delay critical messages.

## Sources

- [Email sender guidelines — Gmail Help](https://support.google.com/mail/answer/81126)