menu_book9 provider guides · Updated May 2026

SMTP setup guides.

Step-by-step instructions to send email through Gmail, Outlook, Yahoo, Zoho, SendGrid, Mailgun, Resend, Brevo, or your own server. Server settings, App Passwords, DNS records, and fixes for the 535 / 550 errors that everyone hits.

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Illustration of a Gmail envelope unlocked by a golden key

Beginner3 min setup

Gmail SMTP Setup: How to Get an App Password (2026 Step-by-Step Guide)

Free Google account. App Password required. 3 minutes.

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Illustration of an Outlook envelope inside a glowing shield

Intermediate5 min setup

Outlook & Microsoft 365 SMTP Setup (2026 App Password Guide)

Personal or business account. App Password + Authenticated SMTP.

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Illustration of a Yahoo envelope with a key in purple tones

Beginner3 min setup

Yahoo Mail SMTP Setup: App Password & Server Settings (2026 Guide)

Free Yahoo Mail. App Password mandatory. 3 minutes.

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Beginner4 min setup

Zoho Mail SMTP Setup for Custom Domains (2026 Step-by-Step Guide)

Best free option for custom domains. Pick the right region.

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Illustration of a rocket carrying envelopes upward in SendGrid blue

Intermediate6 min setup

SendGrid SMTP Setup: API Key Authentication Step-by-Step (2026)

100 emails/day free forever. API key, not password. Username = 'apikey'.

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Illustration of a Mailgun orange delivery truck carrying envelopes

Intermediate10 min setup

Mailgun SMTP Setup: Domain Verification & DNS Records (2026 Guide)

Transactional pro. Pay-as-you-go after trial. Verified domain required.

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Minimalist illustration of an envelope with a sharp forward arrow for Resend

Beginner5 min setup

Resend SMTP Setup: API Key, DNS, and Send in 5 Minutes (2026)

3,000 emails/month free. Username is literally 'resend'. Developer-first.

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Illustration of a Brevo envelope with abstract hearts and graphs in cyan

Beginner5 min setup

Brevo (Sendinblue) SMTP Setup: Free 300/day Forever (2026 Guide)

300 emails/day free forever. Marketing + transactional + chat in one.

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Illustration of a custom-configured email envelope with floating gears and connection lines

Intermediate8 min setup

Custom & cPanel SMTP Setup: Self-Hosted Email Servers (2026)

Any SMTP server works. Match host, port, and encryption — the rest is identical.

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