New

• dashboard: add admin DNSBL blacklist checker #324
• subscribe: use customer tracking domain for confirm links
• signup-forms: add configurable from_address per signup form
• subscribe: route confirmation emails through pipeline with branding

Fixed

• infra: set SMTP EHLO hostname to mail3.euromail.dev for FCrDNS match #326
• infra: route outbound SMTP through 204.168.195.152 to bypass Microsoft S3140 #325
• api: remove duplicate /confirm route registration
• migration: use IF NOT EXISTS for from_address column
• api: properly isolate subscribe routes from restrictive global CORS