Phantse iminyaka emibini emva kohlaziyo lokugqibela, ukukhutshwa kweseva ye-Sendmail 8.17.2 SMTP kwagqitywa. Ukongeza kulungiso lwe-bug, inguqulelo entsha iphucula inkxaso yeedilesi ze-imeyile ezinobumba bealfabhethi zesizwe (EAI, Idilesi ye-imeyile yamazwe ngamazwe), yongeza inkxaso kwiinguqulelo ezintsha ze-macOS, iphucula ukusebenza kwe-DANE (i-DNS-based Authentication of Named Entities) ihlola , kunye nepharamitha ye-MaxMimeHeaderLength yokuthintela ukuthotywa kokusebenza ngokungagqibekanga imiselwe kwi-2048/1024.
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