E-Warmup
E-Warmup is an AI-powered email deliverability and automated inbox warmup platform built to keep campaigns out of spam and the promotions tab.
Backed by 10+ years of manual deliverability consulting for 4,000+ clients, E-Warmup pairs your mailboxes with a peer-to-peer network of 40,000+ real inboxes to secure 98% primary inbox placement.
Key capabilities:
• AI Read Emulation: Simulates authentic human reading speeds, scroll pauses, and multi-language replies instead of detectable bot opens.
• Real-Copy Warmup: Train spam filters using your actual sales sequences and niche topics.
• Multi-ESP Support: Route warmup through Gmail, Outlook, Zoho, SendGrid, Amazon SES, or custom SMTP.
• 24/7 Reputation Shield: Continuous DNS health tracking (SPF, DKIM, DMARC), bounce monitoring, and automated blacklist removal across 100+ lists.
• Seed List Warmup: Protect non-SMTP platforms like Klaviyo and Mailchimp.
Start warm up & fix your deliverability free in 25 sec.
Learn more
WillItInbox
WillItInbox is an email deliverability and validation platform for SaaS teams, developers, agencies, marketers, and newsletter operators that depend on outbound email.
Teams can generate a unique test inbox, send a real message from their app or ESP, and receive a practical deliverability report across SPF, DKIM, DMARC, BIMI, DNS, reverse DNS, blocklists, TLS, headers, content, links, reputation, and sender infrastructure.
WillItInbox also validates individual emails and bulk CSV lists using syntax, DNS/MX, disposable, role, typo, provider, catch-all, SMTP, suppression, and confidence signals. It includes domain monitoring, DMARC report analysis, sending source visibility, provider reputation checks, API keys, webhooks, scheduled checks, incident diagnostics, inbox placement checks, team workspaces, and exportable reports.
Paid plans start at $39/month. PAYG credits are available for extra email validation and deliverability testing usage.
Learn more
InboxGreen
InboxGreen is a free email deliverability checker that tests SPF, DKIM and DMARC records for any domain instantly, no account required. It shows exactly which DNS records pass, fail, or are missing, and explains what each result means for inbox placement.
The platform includes 28 free DNS tools: DMARC analyzer, DMARC policy tester, SPF generator, SPF tester, DKIM generator, DKIM checker, DKIM selector finder, blacklist checker, email header analyzer, MX lookup, TXT lookup, WHOIS lookup, reverse DNS, DNS propagation checker, SMTP port checker, IP address info, and more.
For teams that need to fix issues, the FixKit provides step-by-step DNS fix instructions for every problem found. The Monitoring plan watches up to 5 domains and sends alerts the moment SPF, DKIM or DMARC breaks. The Agency plan covers up to 30 domains with white-label PDF reports.
Built for developers, marketers, and anyone who sends email and needs it to actually reach the inbox.
Learn more
GlockApps
Where are your emails delivered?
Receive reports with an in-depth understanding of what your emails are doing and how to increase your reputation and deliverability before you hit Send!
In your reports you can:
❖ Check to see if your sending IPs or Domains are listed within 50+ major email blacklists.
❖ Protect your identity by identifying, monitoring, and rejecting unauthenticated outgoing emails.
❖ Identify whether your email’s content or reputation is being flagged as Spam by all major B2B and B2C email marketing providers.
❖ Fix HTML errors and identify “risky” content before sending.
❖ Get instantly notified when issues occur by email, Slack, or Telegram.
Want to speak with an expert?
Book a 1-hour consulting call to get all your email marketing and deliverability questions answered. We also offer comprehensive Email Deliverability Audits with personalized recommendations for companies looking to maximize their revenue with email.
Learn more