Event Type "File Downloaded" triggering without successful download.

We transfer files to an external client and during their maintenance window (of which we are not notified prior), the connection to their site is somewhat successful, but the transfer fails with a "Permission Denied" error. We have an event set up in Serv-U to send a notification when a file is downloaded which is triggered even when the file is not actually transferred. Each retry will send another email.

How do I stop the notification being sent if the file transfer is not successful? 

Serv-U 15.3.2.172 running on Windows Server 2016

Error:

2023-05-15 06:00:24 Host 'ftp.example.com' is known and matches the RSA host key
2023-05-15 06:00:24 SSH_MSG_NEWKEYS sent
2023-05-15 06:00:24 SSH_MSG_NEWKEYS received
2023-05-15 06:00:24 SSH_MSG_SERVICE_REQUEST sent
2023-05-15 06:00:24 SSH_MSG_SERVICE_ACCEPT received
2023-05-15 06:00:24 Authentications that can continue: publickey,keyboard-interactive,password
2023-05-15 06:00:24 Next authentication method: publickey
2023-05-15 06:00:24 Authentication succeeded (publickey).
2023-05-15 06:00:24 connection completed
2023-05-15 06:00:25 Skip remote directory check true
2023-05-15 06:00:25 sftp channel opened
2023-05-15 06:00:25
2023-05-15 06:00:25 Copying from INTERNAL.FTP to EXTERNAL.FTP
2023-05-15 06:00:25 copy /Outbound/File/FileExample.xlsx.pgp to /Inbound/FileExample.xlsx.pgp
Permission denied
com.uc4.ftpjob.DataTransferException: Unable to open file /Inbound/FileExample.xlsx.pgp for output on system EXTERNAL.FTP.
at com.uc4.ftpjob.commands.impl.CopyCommand.throwDataException(CopyCommand.java:711)
at com.uc4.ftpjob.commands.impl.CopyCommand.execute(CopyCommand.java:612)
at com.uc4.ftpjob.commands.impl.CopyCommand.execute(CopyCommand.java:443)
at com.uc4.ftpjob.commands.CommandProcessor.execCommand(CommandProcessor.java:308)
at com.uc4.ftpjob.commands.CommandProcessor.processCommands(CommandProcessor.java:164)
at com.uc4.ftpjob.commands.CommandProcessor$processCommands$0.call(Unknown Source)
at FtpJob.runJob(FtpAgent.groovy:320)
at com.uc4.extensibility.types.CITAgent.dispatchJob(CITAgent.java:258)
at com.uc4.ex.cit.CITJob.execute(CITJob.java:195)
at com.uc4.ex.Job.run(Job.java:463)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.uc4.ftpjob.DataTransferException: Permission denied
at com.uc4.ftpjob.commands.SFtpCommandImpl.getOutputStream(SFtpCommandImpl.java:268)
at com.uc4.ftpjob.commands.FtpFacadeCommandImpl.getOutputStream(FtpFacadeCommandImpl.java:106)
at com.uc4.ftpjob.commands.impl.CopyCommand.execute(CopyCommand.java:601)