From 20cf6e98f1362be06db9b3d83e758ca3af5df8a2 Mon Sep 17 00:00:00 2001
From: Samuel Cochran <sj26@sj26.com>
Date: Wed, 18 Jul 2012 11:27:27 +0800
Subject: [PATCH] Discard periods prefixing SMTP data per RFC 821 4.5.2

---
 examples/dotmail         | 14 ++++++++++++++
 lib/mail_catcher/smtp.rb |  5 ++++-
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 examples/dotmail

diff --git a/examples/dotmail b/examples/dotmail
new file mode 100644
index 0000000..46d72d4
--- /dev/null
+++ b/examples/dotmail
@@ -0,0 +1,14 @@
+To: Blah <blah@blah.com>
+From: Me <me@sj26.com>
+Subject: Whatever
+Content-Type: text/plain
+
+Plain text mail
+
+With some dot lines:
+
+.
+
+...
+
+Done.
diff --git a/lib/mail_catcher/smtp.rb b/lib/mail_catcher/smtp.rb
index eb60231..6088013 100644
--- a/lib/mail_catcher/smtp.rb
+++ b/lib/mail_catcher/smtp.rb
@@ -34,7 +34,10 @@ class MailCatcher::Smtp < EventMachine::Protocols::SmtpServer
 
   def receive_data_chunk(lines)
     current_message[:source] ||= ""
-    current_message[:source] += lines.join("\n")
+    lines.each do |line|
+      # RFC821 4.5.2 says leading periods should be stripped from the body data.
+      current_message[:source] << line.sub(/\A\./, "") << "\n"
+    end
     true
   end