PostStack

Extra Credit builds an outline of PostStack's docs the first time your work uses it. Until then, start at the official documentation.

• mailfloss Stop spam signups: block disposable and invalid emails and suggest typo fixes. 500 free a month
• Mailfornet Disposable inboxes for end-to-end signup tests, with long-polling and HMAC-signed webhooks
• MailRambo Verify email deliverability with a strict yes/no, disposable and catch-all detection
• MailSenpai DNS Check Check a domain's SPF, DKIM, DMARC and MX records and get what to fix, with the values to publish
• Mailtrap Email API and SMTP for sending transactional and bulk emails, with email testing sandbox for safe development
• Nitrosend Send marketing and transactional email; manage contacts, segments and flows
• RankFabrik Verify Validate email addresses for deliverability, syntax and disposable detection
• Sendinblue A service that provides solutions relating to marketing and/or transactional email and/or SMS
• SendRaven Email for AI agents: send email, receive replies as threads, with per-key send limits and approvals
• SMTPfast Send transactional email, manage contacts and broadcasts, free 3,000 emails/month
• TempMailGrab Disposable inboxes for email testing with OTP extraction and webhooks
• uchecker Bulk email verification with full SMTP server responses