fix: Software caused connection abort errors due fast open and close connections

Author: TomFreudenberg

lib/midi-smtp-server.rb

@@ -189,7 +189,7 @@ def serve(io)
       # handle connection
       begin
         # reply welcome
-        io.print "220 #{Thread.current[:ctx][:server][:local_host]} says welcome!\r\n"
+        io.print "220 #{Thread.current[:ctx][:server][:local_host]} says welcome!\r\n" unless io.closed?
         # while data handle communication
         begin
           loop do
@@ -224,7 +224,7 @@ def serve(io)
                 # log smtp dialog // message data is stored separate
                 logger.debug(">>> #{output}")
                 # smtp dialog response
-                io.print("#{output}\r\n")
+                io.print("#{output}\r\n") unless io.closed?
               end
 
             end

midi-smtp-server.gemspec

@@ -1,7 +1,7 @@
 Gem::Specification.new do |s|
   s.name        = 'midi-smtp-server'
-  s.version     = '2.1.2'
-  s.date        = '2015-09-12'
+  s.version     = '2.1.3'
+  s.date        = '2018-04-19'
   s.summary     = "MidiSmtpServer Class"
   s.description = "A small and highly customizable ruby SMTP-Server."
   s.authors     = ["Tom Freudenberg"]