Alex Lumpov commented on Bug LOGBACK-909

expected result
2 different message

subject=Message1
ERROR ? - Message1

subject=Message2
ERROR ? - Message2

but it seems that there is a race condition which leads to the fact that
either 1st thread sends 2 equal messages or second thread sends 2 equal messages

to avoid this problem either
create MimeMessage mimeMsg per thread in SMTPAppenderBase

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