diff --git a/scripts/workers/email_verifier.py b/scripts/workers/email_verifier.py
index 64cab33..61398b8 100644
--- a/scripts/workers/email_verifier.py
+++ b/scripts/workers/email_verifier.py
@@ -40,6 +40,8 @@ logging.basicConfig(
 DATABASE_URL = os.environ.get("DATABASE_URL", "postgresql://pw:pw@localhost:5432/performancewest")
 OUR_DOMAIN = "performancewest.net"
 OUR_EMAIL = f"verify@{OUR_DOMAIN}"
+# Bind SMTP probes to secondary IP so campaign sending IP (.71) stays clean
+VERIFY_SOURCE_IP = os.environ.get("VERIFY_SOURCE_IP", "207.174.124.72")
 
 # Regex for basic email validation
 EMAIL_RE = re.compile(r"^[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}$")
@@ -108,7 +110,7 @@ def verify_email(email: str) -> tuple[bool, str]:
     # Step 4: SMTP handshake + catch-all detection
     for mx_host in mx_hosts[:2]:  # Try first 2 MX servers
         try:
-            with smtplib.SMTP(timeout=10) as smtp:
+            with smtplib.SMTP(timeout=10, source_address=(VERIFY_SOURCE_IP, 0)) as smtp:
                 smtp.connect(mx_host, 25)
                 smtp.helo(OUR_DOMAIN)
                 code, _ = smtp.mail(OUR_EMAIL)