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com.fsck.k9.mail.transport.SmtpTransport$NegativeSmtpReplyException: Negative SMTP reply: 504 5.5.2 <android-8513f86d1377e753>: Helo command

rejected: need fully-qualified hostname	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)