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-rw-r--r--actionmailer/lib/action_mailer/base.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index cd9bbd2d7b..aea2498d4d 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -593,6 +593,8 @@ module ActionMailer #:nodoc:
end
end
+ m.content_transfer_encoding = '8bit' unless m.body.only_us_ascii?
+
@mail = m
end