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Best Mailbox Infrastructure Providers: Recommendations Needed | Clay

Discuss Anything

Best Mailbox Infrastructure Providers: Recommendations Needed

·Dec 01, 2025 11:20 PM·

Hey 🚀 What is the best mailboxes infrastructure provider, and why? Thanks for the recommendations.

5 comments

· Sorted by Oldest

Hunain F.
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I’d recommend instantly or smartlead both offer strong deliverability automatic warmup scalable sending and easy domain rotation overall the best infrastructure for high volume outreach
Casper M.
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Hunain F. Appreciate the reply! I meant the mailbox infrastructure itself (SMTP/IMAP providers like Pager.ai or https://www.inboxkit.com/), not the sequencers.
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Hunain F.
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Casper M. in that case I’d recommend looking at Pager.ai or InboxKit Both provide stable SMTP/IMAP infrastructure, high-deliverability IPs, automated warmup and built in monitoring so your domains stay healthy they’re designed specifically for scaling sending without relying on traditional sequencers.
Casper M.
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Have you tested it? Any thoughts on which is better?
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Hunain F.
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Yes I’ve tested both. Pager.ai has been more stable and consistent for inboxing overall better performance than InboxKit in my experience.