com.fsck.k9.mail.MessagingException: Unable to send message

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com.fsck.k9.mail.MessagingException: Unable to send message
at com.fsck.k9.mail.transport.SmtpTransport.checkLine(SmtpTransport.java:649)
at com.fsck.k9.mail.transport.SmtpTransport.executeSimpleCommand(SmtpTransport.java:690)
at com.fsck.k9.mail.transport.SmtpTransport.executeSimpleCommand(SmtpTransport.java:654)
at com.fsck.k9.mail.transport.SmtpTransport.sendMessageTo(SmtpTransport.java:524)
at com.fsck.k9.mail.transport.SmtpTransport.sendMessage(SmtpTransport.java:495)
at com.fsck.k9.controller.MessagingController.sendPendingMessagesSynchronous(MessagingController.java:3563)
at com.fsck.k9.controller.MessagingController$20.run(MessagingController.java:3314)
at com.fsck.k9.controller.MessagingController.run(MessagingController.java:435)
at java.lang.Thread.run(Thread.java:818)

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