diff --git a/lib/postal/smtp_server/client.rb b/lib/postal/smtp_server/client.rb
index 2f01e74..8ff2615 100644
--- a/lib/postal/smtp_server/client.rb
+++ b/lib/postal/smtp_server/client.rb
@@ -430,6 +430,7 @@ module Postal
           end
         end
         transaction_reset
+        @state = :welcomed
         '250 OK'
       end