Email Deliverability Concepts
Authoritative definitions and explanations for key email deliverability concepts used throughout InboxAlly documentation.
16 articlesEmail Deliverability
Email deliverability is the ability of an email to reach the recipient's inbox rather than being filtered to spam, bounced, or blocked.
Updated March 10, 2026Inbox Placement
Inbox placement is the percentage of sent emails that successfully land in the recipient's primary inbox rather than spam, promotions, or other folders.
Updated March 9, 2026Seed Emails
Seed emails are real email addresses used to test and improve inbox placement by generating authentic engagement signals with mailbox providers.
Updated March 9, 2026Engagement Signals
Engagement signals are recipient interactions — opens, clicks, replies, and reading time — that mailbox providers use to evaluate sender quality.
Updated March 10, 2026Sender Reputation
Sender reputation is the score mailbox providers assign to email senders based on engagement, complaint rates, and sending behavior.
Updated March 10, 2026Spam Filters
Spam filters are automated systems used by mailbox providers to evaluate incoming emails and determine whether they should reach the inbox or be blocked.
Updated March 10, 2026Mailbox Providers
Mailbox providers are services like Gmail, Yahoo, and Microsoft Outlook that host email accounts and make inbox placement decisions for their users.
Updated March 9, 2026Spam Complaints
Spam complaints occur when email recipients mark a message as spam, directly damaging the sender's reputation with mailbox providers.
Updated March 9, 2026Open Rate
Open rate is the percentage of delivered emails that recipients open, serving as a key engagement metric and deliverability signal.
Updated March 9, 2026Engagement Rate
Engagement rate is the overall measure of how actively recipients interact with your emails, combining opens, clicks, replies, and other interactions.
Updated March 9, 2026Email Authentication
Email authentication is the set of protocols — SPF, DKIM, and DMARC — that verify a sender's identity and protect against spoofing.
Updated March 10, 2026Reputation Recovery
Reputation recovery is the process of rebuilding sender reputation after a deliverability setback such as blocklisting, high complaint rates, or spam folder placement.
Updated March 10, 2026Spam Folder Placement
Spam folder placement occurs when mailbox providers route an email to the recipient's spam or junk folder instead of the inbox.
Updated March 10, 2026Email Warmup
Email warmup is the process of gradually increasing sending volume on a new or dormant email domain or IP to establish sender reputation with mailbox providers.
Updated March 10, 2026List Hygiene
List hygiene is the practice of regularly cleaning and maintaining email lists to remove invalid, inactive, and risky addresses that damage sender reputation.
Updated March 10, 2026Spam Traps
Spam traps are email addresses used by mailbox providers and blocklist operators to identify senders with poor list practices.
Updated March 10, 2026