I'm using Amazon SES with SSL to send emails via Logback's SMTPAppender. It usually works, but sometimes I receive the following error:

0:01:51,863 |-ERROR in ch.qos.logback.classic.net.SMTPAppender[EMAIL] - Error occurred while sending e-mail notification. com.sun.mail.smtp.SMTPSendFailedException: 554 Transaction failed: Illegal header 'Caused by'.

        at com.sun.mail.smtp.SMTPSendFailedException: 554 Transaction failed: Illegal header 'Caused by'.

        at      at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2114)
        at      at com.sun.mail.smtp.SMTPTransport.finishData(SMTPTransport.java:1900)
        at      at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1122)
        at      at javax.mail.Transport.send0(Transport.java:195)
        at      at javax.mail.Transport.send(Transport.java:124)
        at      at ch.qos.logback.core.net.SMTPAppenderBase.sendBuffer(SMTPAppenderBase.java:395)
        at      at ch.qos.logback.core.net.SMTPAppenderBase$SenderRunnable.run(SMTPAppenderBase.java:690)
        at      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
        at      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at      at java.lang.Thread.run(Thread.java:679)


I'm aware that Amazon only allows emails with legal headers through SES, but I have no idea where Amazon is getting this header from. Has anyone else seen this?

jason


--
Jason Bennett, jasonab@acm.org
E pur si muove!
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