I run three separate CodeIgniter-based donation sites that share the same SMTP credentials. Since a recent malware incident (now fully cleaned) none of the transactional emails are leaving the servers—no enquiry-form alerts, donation receipts, or certificate mails. I need you to trace the break in the mail flow, restore the correct SMTP configuration, and confirm that every site can again send all three kinds of notifications without touching or disrupting any of the custom code we already rely on. Deliverables • Repair and verify SMTP settings on all three installations • Prove successful delivery of enquiry-form notifications, donation receipts, and certificate emails from each site (test addresses provided) • Brief change log so I know exactly what was adjusted Acceptance criteria • All tests hit the inbox (not spam) on first attempt • No new PHP errors or warnings in CodeIgniter logs • Core and custom functionality of each site remains unaffected