2018-02-22 11:08:46,101 ERROR [org.ametys.core.schedule.AmetysJob$org.ametys.core.schedule.SendMail] (AmetysRuntimeScheduler_Worker-6;) An exception occured during the execution of the Schedulable 'org.ametys.core.schedule.SendMail'
javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
        com.sun.mail.smtp.SMTPAddressFailedException: 554 5.7.1 <unknown[54.36.103.88]>: Client host rejected: Access denied

        at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1862)
        at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1118)
        at org.ametys.core.util.mail.SendMailHelper$MailSender.sendMail(SendMailHelper.java:669)
        at org.ametys.core.util.mail.SendMailHelper.sendMail(SendMailHelper.java:284)
        at org.ametys.core.util.mail.SendMailHelper.sendMail(SendMailHelper.java:163)
        at org.ametys.core.util.mail.SendMailHelper.sendMail(SendMailHelper.java:139)
        at org.ametys.core.util.mail.SendMailHelper.sendMail(SendMailHelper.java:121)
        at org.ametys.core.util.mail.SendMailHelper.sendMail(SendMailHelper.java:102)
        at org.ametys.plugins.core.impl.schedule.SendMailSchedulable.execute(SendMailSchedulable.java:63)
        at org.ametys.core.schedule.AmetysJob.execute(AmetysJob.java:144)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
Caused by: com.sun.mail.smtp.SMTPAddressFailedException: 554 5.7.1 <unknown[54.36.103.88]>: Client host rejected: Access denied

        at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1762)
        ... 11 more