Index: src/alerts.c
==================================================================
--- src/alerts.c.orig	2023-02-25 19:23:39 UTC
+++ src/alerts.c
@@ -617,7 +617,7 @@ AlertSender *alert_sender_new(const char *zAltDest, u3
     if( zRelay ){
       u32 smtpFlags = SMTP_DIRECT;
       if( mFlags & ALERT_TRACE ) smtpFlags |= SMTP_TRACE_STDOUT;
-      p->pSmtp = smtp_session_new(p->zFrom, zRelay, smtpFlags);
+      p->pSmtp = smtp_session_new(smtp_domain_of_addr(p->zFrom), zRelay, smtpFlags);
       smtp_client_startup(p->pSmtp);
     }
   }
--- src/smtp.c.orig	2023-02-25 19:23:39 UTC
+++ src/smtp.c
@@ -581,7 +581,7 @@ int smtp_send_msg(
 ** The input is a base email address of the form "local@domain".
 ** Return a pointer to just the "domain" part.
 */
-static const char *domainOfAddr(const char *z){
+const char *smtp_domain_of_addr(const char *z){
   while( z[0] && z[0]!='@' ) z++;
   if( z[0]==0 ) return 0;
   return z+1;
@@ -625,12 +625,12 @@ void test_smtp_send(void){
   zFrom = g.argv[3];
   nTo = g.argc-4;
   azTo = (const char**)g.argv+4;
-  zFromDomain = domainOfAddr(zFrom);
+  zFromDomain = smtp_domain_of_addr(zFrom);
   if( zRelay!=0 && zRelay[0]!= 0) {
     smtpFlags |= SMTP_DIRECT;
     zToDomain = zRelay;
   }else{
-    zToDomain = domainOfAddr(azTo[0]);
+    zToDomain = smtp_domain_of_addr(azTo[0]);
   }
   p = smtp_session_new(zFromDomain, zToDomain, smtpFlags, smtpPort);
   if( p->zErr ){