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-rw-r--r--lib/action_mailbox/mail_ext/addresses.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/action_mailbox/mail_ext/addresses.rb b/lib/action_mailbox/mail_ext/addresses.rb
index f64c3ef5df..377373bee6 100644
--- a/lib/action_mailbox/mail_ext/addresses.rb
+++ b/lib/action_mailbox/mail_ext/addresses.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
class Mail::Message
def from_address
header[:from]&.address_list&.addresses&.first