How Email Infrastructure Impacts OTP and Magic Link Authentication Success Rates
ID: aa342816-bce3-5404-8da4-7351df286506
STIX ID: report--aa342816-bce3-5404-8da4-7351df286506
Feed Name: Security Boulevard
Date Published: 2026-04-28
Date Updated: 2026-04-28
Author: MojoAuth Blog - Passwordless Authentication & Identity Solutions
This blog post argues that email deliverability is the weakest link in OTP and magic-link authentication, describing causes (spam filters, delivery delays, low engagement, poor sender reputation, missing SPF/DKIM/DMARC, cold domains) and recommending fixes such as domain/IP warm-up, proper email authentication records, avoiding shared-IP pitfalls, and monitoring delivery rate, time-to-inbox, bounce rate, and spam placement.
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