Issue Type:	Bug
Affects Versions:	1.0.6
Assignee:	Logback dev list
Components:	logback-core
Created:	05/Jul/12 9:36 PM
Description:	sendBuffer method reuses mimeMsg field to send emails. Sending emails is done asynchronously in threads. This results into sending invalid messages, for example subject may come from a different message. As a quick and dirty fix the "sendBuffer" method can be declared as synchronized. A better approach would be to create an instance of MimeMessage for every email to be sent. P.S. While scrutinizing this module I also noticed that "cb.asList();" line in the "append" method seems to be doing nothing and hence brings an unnecessary minor performance impact.
Project:	logback
Priority:	Major
Reporter:	Yuri Cherio

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