Breaking changes:
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Message#without_attachments! now deletes nested attachments. (TylerRick)
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Sendmail and exim delivery now raise DeliveryError when the command exits with a nonzero exitstatus. (benmmurphy, CoolElvis)
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Sendmail and exim delivery :arguments option must be an array of string args. (benmmurphy)
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Passing unparsed headers to Mail::Field.new is no longer supported. Use Mail::Field.parse. (jeremy)
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Removed long-deprecated features: Message#register_for_delivery_notification, #has_transfer_encoding?, #add_transfer_encoding, #transfer_encoding, #message_content_type, #mime_parameters, #encode!, and Part#inline_content_id. (jeremy)
Compatibility:
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Handle a wide variety of non-RFC Message-ID formats. (peterkovacs)
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Gracefully parse invalid dates in Date and Received headers. (okkez)
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Converting to multipart moves Content-* headers to the new part. (kirikak2)
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Multipart Content-Type no longer includes a needless charset param. (kirikak2)
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Replies prefix subject with “Re: ” instead of “RE: ” per 5322 3.6.5. (mashedcode)
Features:
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Message#inspect_structure and PartsList#inspect_structure pretty-print the hierarchy of message parts. (TylerRick)
Please check [2-7-stable](github.com/mikel/mail/blob/2-7-stable/CHANGELOG.rdoc) for previous changes.