This means that the server you were trying to connect to responded, but stopped talking to you. The analogy is a phone call - you ring someone, they answer, you say "hello" and they hang up.
Either your network is not allowing the connection or you've got a setting wrong and the email server doesn't like it. You'll need to do one or more of:
Selam Döndü,
Büyük olasılıkla Jira Server'dan smtp.gmail.com'a çıkışınız yoktur. Örneğin Jira Server dışarıya proxy ile çıkabiliyordur sadece. Network bağlantısında sorun olup olmadığını, network ekibi Jira Server'ın üstünde aşağıdakine benzer bir komutla kontrol etse iyi olur.
telnet smtp.gmail.com 587
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