Sender reputation is the standing a sending IP address and domain have with mailbox providers, built from how recipients and receiving systems have reacted to past mail. It strongly influences whether new messages reach the inbox, the spam folder or are rejected.
Why it matters
Providers do not publish exact formulas, but the signals are well known: spam complaints, bounce rates, hits on spam traps, whether recipients open, reply or delete unread, and whether SPF, DKIM और DMARC pass. Reputation is tracked separately for the IP and the domain, and each provider keeps its own view, so you can be fine at one and poor at another. Shared IPs inherit the behaviour of other customers on the same pool.
Example
Two senders mail the same 100,000 recipients. Sender A has 0.05% complaints and removes hard bounces immediately. Sender B has 0.5% complaints and keeps mailing dead addresses. Sender B's mail will drift to spam first even though the content is identical.
Many providers offer free dashboards for senders (for instance Gmail Postmaster Tools) that show domain and IP reputation trends.
Common mistakes
- Judging reputation by one blocklist; each receiver uses its own data.
- Changing sending domains or IPs frequently, which resets you to unknown.
- Sudden volume spikes; see IP warm-up.
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