From 919ee46ba4a0c7180d86712467a3179ca8705df5 Mon Sep 17 00:00:00 2001
From: Aine <aine@etke.cc>
Date: Wed, 16 Nov 2022 10:25:26 +0200
Subject: [PATCH] do not leak domain in multi-domain mode

---
 smtp/manager.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/smtp/manager.go b/smtp/manager.go
index 217886d..db94d32 100644
--- a/smtp/manager.go
+++ b/smtp/manager.go
@@ -58,13 +58,16 @@ func NewManager(cfg *Config) *Manager {
 	cfg.Bot.SetSendmail(mailsrv.SendEmail)
 
 	s := smtp.NewServer(mailsrv)
-	s.Domain = cfg.Domains[0]
 	s.ReadTimeout = 10 * time.Second
 	s.WriteTimeout = 10 * time.Second
 	s.MaxMessageBytes = cfg.MaxSize * 1024 * 1024
 	s.AllowInsecureAuth = !cfg.TLSRequired
 	s.EnableREQUIRETLS = cfg.TLSRequired
 	s.EnableSMTPUTF8 = true
+	// set domain in greeting only in single-domain mode
+	if len(cfg.Domains) == 1 {
+		s.Domain = cfg.Domains[0]
+	}
 	if log.GetLevel() == "DEBUG" || log.GetLevel() == "TRACE" {
 		s.Debug = os.Stdout
 	}