From 663c6be564efdb355598b34b8f083f79a38c726d Mon Sep 17 00:00:00 2001
From: Manuel Mausz <manuel@mausz.at>
Date: Fri, 26 Jun 2026 13:53:30 +0200
Subject: Implement plus addressing for locals

---
 qmail-send.c | 7 +++++++
 realrcptto.c | 9 ++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/qmail-send.c b/qmail-send.c
index caa5b39..168d190 100644
--- a/qmail-send.c
+++ b/qmail-send.c
@@ -147,6 +147,13 @@ char *recip;
   at = byte_rchr(addr.s,addr.len,'@');
 
   if (constmap(&maplocals,addr.s + at + 1,addr.len - at - 1)) {
+    /* sub-addressing for local domains */
+    for (i = 1; i < at - 1; ++i) {
+      if (addr.s[i] == '+') {
+        addr.s[i] = '-';
+        break;
+      }
+    }
     if (!stralloc_cat(&rwline,&addr)) return 0;
     if (!stralloc_0(&rwline)) return 0;
     return 1;
diff --git a/realrcptto.c b/realrcptto.c
index 5ae9684..8f4d50e 100644
--- a/realrcptto.c
+++ b/realrcptto.c
@@ -269,7 +269,7 @@ int depth;
         && extension && !str_diffn(extension, "mailbox-", 8))
       username = extension + 8;
 
-    /* remove plus-addressing */
+    /* remove sub-addressing */
     username[str_chr(username, '+')] = '\0';
 
     env_put2("DTUSER", username);
@@ -316,6 +316,13 @@ int depth;
   if (constmap(&maplocals,localpart.s + at + 1,localpart.len - at - 1)) {
     localpart.len = at;
     localpart.s[at] = '\0';
+    /* sub-addressing for local domains */
+    for (i = 1; i < localpart.len - 1; ++i) {
+      if (localpart.s[i] == '+') {
+        localpart.s[i] = '-';
+        break;
+      }
+    }
   } else {
     unsigned int xlen,newlen;
     char *x;
-- 
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