- receivers (mailthon.envelope.Envelope attribute)
- (mailthon.headers.Headers attribute)
- rejected (SendmailResponse attribute)
- resent (mailthon.headers.Headers attribute)
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- Response (class in mailthon.response)
- response_cls (Postman attribute)
-
RFC
- RFC 2821
- RFC 2822, [1]
- RFC 3490
- RFC 6531, [1]
- RFC 6532
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