Switch email transport to nodemailer direct (no SMTP relay)

[Copilot]

Drops the MailerSend SMTP relay in favour of nodemailer's built-in direct transport, which resolves recipient MX records via DNS and delivers mail without third-party credentials.

Transport change

// Before — requires EMAIL_USERNAME / EMAIL_PASSWORD env vars + external relay
createTransport({ host: 'smtp.mailersend.net', port: 587, auth: { ... } })

// After — no credentials, delivers directly
createTransport({ direct: true, name: 'mail.qbreader.org' })

EMAIL_USERNAME and EMAIL_PASSWORD are no longer used.

Optional DKIM signing

If DKIM_PRIVATE_KEY and DKIM_SELECTOR env vars are set, the transporter automatically signs all outgoing mail.

Required DNS records

Documented in the file header — five records needed before direct delivery will be accepted by major receivers:

Record	Name	Value
TXT (SPF)	@	v=spf1 ip4:<IP> ~all
TXT (DKIM)	<selector>._domainkey.qbreader.org	DKIM public key
TXT (DMARC)	_dmarc.qbreader.org	v=DMARC1; p=quarantine; …
A + PTR (rDNS)	mail.qbreader.org ↔ <server IP>	Must match the name in transport config
MX	@	mail.qbreader.org (for receiving replies)

Original prompt

Use nodemailer direct transport to send emails, and leave instructions for what DNS settings I need to chafe

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