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phpBB + MailKite

phpBB is one of the most widely used open-source forum platforms. Point its SMTP at MailKite and every notification, topic alert, and private message goes out over your own DKIM-signed domain.

What you need

A verified domain with SPF + DKIM published
Your API key (mk_live_…)
A phpBB installation

Configure SMTP

Open the phpBB Administration Control Panel (ACP) and navigate to Board settings → Email settings. Set the transport method to SMTP and enter the MailKite details.

SMTP Host	`smtp.mailkite.dev`
SMTP Port	`587`
Encryption	TLS (STARTTLS)
Username	`mailkite`
Password	Your API key (`mk_live_…`)
From Address	`hello@yourdomain.com` (on a verified domain)

ACP → Board settings → Email settings

# ACP → Board settings → Email settings

Use SMTP:           Yes
SMTP server:        smtp.mailkite.dev
SMTP port:          587
SMTP encryption:    TLS
SMTP authentication: PLAIN
SMTP username:      mailkite
SMTP password:      mk_live_...
Email from address: hello@yourdomain.com

Test it

Register a new user account or use ACP → Maintenance → Send statistics to trigger an outgoing email. Check your MailKite dashboard to confirm delivery.

Troubleshooting

Emails not sending — confirm the From address is on a verified domain.
535 Authentication failed — your password must be your mk_live_… API key, not a separate SMTP password.
Settings not applying — phpBB caches SMTP settings. Clear the cache after changes via ACP → Maintenance → Purge cache.

See the SMTP relay docs for the full connection reference, or all integrations for other platforms.