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It is an advanced MTA built to handle the most critical reliability, performance, security, and deliverability requirements. | It offers a simple REST-based JSON API enabling you to thoroughly check and verify email addresses right at the point of entry into your system. |
Deliverability Engine; High Performance; Authentication; Bounce processing; Input interfaces; Management; Data generation | Syntax & typo check;
Real-time SMTP;
Role check;
Separate addresses using free email providers like "Gmail" or "Yahoo!" from individual domains;
Separate addresses using disposable email providers like "mailinator.com" from individual domains |
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Free email verifier & checker to validate email addresses instantly. Reduce bounces and verify emails in real time.

Protect your domain with Dmarclytics. Run free DMARC, SPF, and DKIM checks to stop spoofing, enhance email authentication, and improve deliverability with powerful monitoring tools.

Use AI to find prospects that need you, automatically craft personalized cold emails for each, and scale effortlessly

It is a free and open-source mail transfer agent that routes and delivers electronic mail. It is Wietse Venema's mail server that started life at IBM research as an alternative to the widely-used Sendmail program. Now at Google, Wietse continues to support it.

It is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with security primarily in mind. It is an excellent choice for both small and large installations. It's fast, simple to set up, requires no special administration and it uses very little memory.

It adds scheduled sending and the easiest, most integrated email reminders to Gmail, helping you reach Inbox Zero.

250ok is an email deliverability tools company that produces a Software‐as‐a‐Service (“SaaS”) platform to monitor and measure the deliverability of email networks. These networks consist of companies sending various forms of messages including marketing, transactional, share, and others from various platforms.

It helps build lasting business relationships, right from your inbox. A sales engagement platform designed for sales professionals and account managers.

It is an all-in-one tool for email deliverability to make your Email Channel Reliable. It raises your sender reputation by interacting with real people in any language and helps you to hit the inbox of your prospect. Full automation.
Your transactional email should NOT trigger spam or marketing filters. Flute Mail plugs into your existing API provider to properly isolate segments, boost inbox rates, and safely store your transactional email data.