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Reputation & IP Warming
Microsoft SNDS and JMRP in 2026: Post-Migration Setup, REST API, and Reputation Signals
Microsoft SNDS and JMRP 2026 guide covering the June 8 migration from sendersupport.olc.protection.outlook.com to the Substrate portal, the new REST API with OAuth 2.0, JMRP privacy trim to ARF header-only, the 30-day…
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Reputation & IP Warming
Yahoo Sender Hub in 2026: CFL, Insights, and Deliverability Signals for Senders
Yahoo Sender Hub 2026 guide covering the Complaint Feedback Loop (per-message ARF reports), Insights aggregate metrics (added late 2025), DKIM-domain enrollment flow, the August 2024 migration from legacy postmaster.yahoo.com, coverage of Yahoo…
smtpedia.com/yahoo-sender-hub -
uncategorized
How to Add a Smartlead Unsubscribe Link: The Complete 2026 Guide
Smartlead is a modern cold outreach platform focused on high-volume multi-mailbox sending for agencies and sales teams that rotate through hundreds of sender addresses to maximize deliverability. The unsubscribe mechanism uses a…
smtpedia.com/smartlead-unsubscribe-link -
Mail Transfer Agents
Haraka MTA: Everything You Need to Know (2026 Guide)
Haraka is a high-performance, open-source Node.js-based Mail Transfer Agent (MTA) built around a plugin architecture that lets you write mail-handling logic in JavaScript. This guide covers architecture, plugin ecosystem, deployment patterns, when…
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Reputation & IP Warming
Cold IP Recovery: Diagnostic, Playbook and When to Abandon a Damaged IP
Cold IP recovery guide: diagnosis phase using Postmaster Tools, SNDS, Sender Score, and blocklist checks; root cause categorization (list quality, content, authentication, blocklist, volume, compromise); recovery playbook step by step; timing expectations…
smtpedia.com/cold-ip-recovery-guide -
Reputation & IP Warming
Email Warmup Calculator: Formulas, Ready-Made Schedules and Python Code
Email warmup calculator complete guide: the exponential formula (volume_day_N = initial * growth_rate^(N-1) capped at target), four ready-made schedules for 10k/100k/500k/1M target volumes, growth rate selection (30% conservative to 50% aggressive), provider-specific…
smtpedia.com/email-warmup-calculator-guide -
Reputation & IP Warming
IP Warmup Schedule: The 30/60/90 Day Ramp That Actually Works in 2026
IP warmup schedule for 2026: complete 30/60/90 day volume ramp with exact daily numbers, engagement tier segment selection (7d/30d/60d/90d), KPI checkpoints (bounce, complaint, delivery, open rates), provider-specific tolerance (Gmail permissive, Microsoft strict,…
smtpedia.com/ip-warmup-schedule-guide -
Bounce Handling
Feedback Loops (FBL) and ARF: Complaint Reports Signup, Parsing and Suppression (RFC 5965)
Feedback Loops (FBL) complete guide covering the ARF format (RFC 5965), signup process for Google Postmaster, Microsoft JMRP, Yahoo, Comcast, and La Poste, per-provider coverage, ARF parsing code in Python, integration with…
smtpedia.com/feedback-loops-fbl-arf-guide -
Bounce Handling
Bounce Categorization: Beyond Hard vs Soft (ESP Schemes and RFC 3463 Mapping)
Bounce categorization guide going beyond hard vs soft. Covers the five practical categories (address, mailbox, policy, content, technical) plus complaint, how to derive them from RFC 3463 enhanced status codes, ESP normalization…
smtpedia.com/bounce-categorization-beyond-hard-vs-soft -
Email Verification
Role-Based Email Addresses: Detection, Risks and Handling (2026)
Role-based email addresses (info@, support@, admin@, sales@) are shared mailboxes that pose specific deliverability and consent risks for marketers. This guide covers the RFC 2142 standard, common role prefixes, detection methods, when…
smtpedia.com/role-based-emails
