https://resend-bshciky61.preview.resend-staging.com/migrate/customer-io 2026-08-12T15:47:33.013Z https://resend-bshciky61.preview.resend-staging.com/migrate/mailchimp 2026-08-12T15:47:33.013Z https://resend-bshciky61.preview.resend-staging.com/migrate/mailgun 2026-08-12T15:47:33.013Z https://resend-bshciky61.preview.resend-staging.com/migrate/postmark 2026-08-12T15:47:33.013Z https://resend-bshciky61.preview.resend-staging.com/migrate/sendgrid 2026-08-12T15:47:33.013Z