Sparkpost
Mailgun
Brevo
Twilio
Mailjet
MailChimp
Postmark
Mandrill
InboxStack
GlockApps
Email Testing By Inbox Pirates
Validity LLC
MxToolBox
Folderly
HetrixTools
Inbox AI
InboxStack is an email deliverability intelligence platform built for teams who need to know why their emails aren't reaching the inbox โ not just that they aren't. At its core is Brain, a proprietary causal AI engine trained on a 22-year deliverability knowledge base, which correlates signals across your ESP, DNS authentication records (SPF, DKIM, DMARC), Google Postmaster Tools, Microsoft SNDS, and 50+ blocklists to pinpoint root causes instead of surfacing raw metrics.
Most deliverability tools stop at monitoring: they show you a drop in inbox placement or a blocklist hit and leave you to investigate. InboxStack goes further, tracing the actual causal chain โ a DKIM misalignment, a reputation dip on a specific sending IP, a content trigger โ so you can fix the real problem instead of guessing.
Setup takes minutes with no migration required: forward your email headers for an instant DNS/authentication audit, or connect your existing ESP and Postmaster accounts for ongoing monitoring. Optional seed testing gives you real inbox-vs-spam placement data across major providers.
Built for agencies managing multiple client domains and growing companies who've outgrown basic authentication checkers, InboxStack turns deliverability from a black box into a diagnosable, fixable system.
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Based on our record, Sparkpost seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Sparkpost. Good deliverability and a robust set of analytics tools make this a solid choice. - Source: dev.to / almost 3 years ago
One of our staff was following up on orders to vendors via phone, and several said they didn't get our email with the PO. Someone said that sparkpost.com, Netsuite's email sender, was blacklisted. Blacklistings are hard (for me) to track down, especially since they clear up quickly. But blacklistings can trump most client's SPF/DKIM/whitelist guards. We are getting pushed by management to help ensure... Source: over 4 years ago
Yes pretty much. In theory, you could use godaddy directly but sending emails through your web host is not something you want to do (They won't help much other than telling you to live with it). For better delivery of emails, you need transactional email providers. Not sure of your budget but my top choices are mandrillapp.com, sparkpost.com and sendgrid.com (in that order). Source: almost 5 years ago
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GlockApps - G-Lock Apps is an interesting tool that might seem simple to some, but is quite essential to most online marketers.
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