Email/Outreach Directory

Amazon SES

AWS cloud email service for sending transactional and marketing messages via API or SMTP at pay-per-use pricing.

Cloudflare Email Routing

Free email routing service that forwards custom domain addresses to any inbox with optional Workers processing.

Inboxy

Email warmup service that uses AI and a private inbox network to boost domain reputation and deliverability.

Instantly

Cold email and outreach platform with built-in email warmup and AI-powered campaign automation.

IPWarmup

Provides pre-warmed SMTP servers with established sender reputation so campaigns can start at full volume.

MailReef

Dedicated cold email sending infrastructure with private SMTP servers, dedicated IPs, and unlimited mailboxes.

Reply.io

Multichannel sales engagement platform that automates outreach across email, LinkedIn, SMS, and calls.

Resend

Developer-first email API for sending transactional and marketing email, with multi-language SDKs, a CLI, and React Email templating.

Smartlead

Cold email platform with unlimited mailbox warmup, AI-driven sending patterns, and deliverability monitoring.

Verifalia

Email validation service that identifies invalid and undeliverable addresses to reduce bounce rates and protect sender reputation.