Error invalid system flag during imap-backup copy

[realhik]

I receive the following error after backing up and copying my emails. The source is an IMAP account on hosteurope.de, and the destination is on all-inkl.com. imap-backup was installed with homebrew.

$ imap-backup version
imap-backup 16.0.0

$ imap-backup copy [...]
/opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/net-imap-0.5.8/lib/net/imap.rb:3455:in 'Net::IMAP#get_tagged_response': Error in IMAP command UID STORE: Invalid system flag \$NOTJUNK (0.001 + 0.016 + 0.016 secs). (Net::IMAP::BadResponseError)
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/net-imap-0.5.8/lib/net/imap.rb:3526:in 'block in Net::IMAP#send_command'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/3.4.0/monitor.rb:201:in 'Monitor#synchronize'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/3.4.0/monitor.rb:201:in 'MonitorMixin#mon_synchronize'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/net-imap-0.5.8/lib/net/imap.rb:3508:in 'Net::IMAP#send_command'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/net-imap-0.5.8/lib/net/imap.rb:3694:in 'block in Net::IMAP#send_command_returning_fetch_results'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/3.4.0/monitor.rb:201:in 'Monitor#synchronize'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/3.4.0/monitor.rb:201:in 'MonitorMixin#mon_synchronize'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/net-imap-0.5.8/lib/net/imap.rb:3691:in 'Net::IMAP#send_command_returning_fetch_results'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/net-imap-0.5.8/lib/net/imap.rb:3687:in 'Net::IMAP#store_internal'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/net-imap-0.5.8/lib/net/imap.rb:2753:in 'Net::IMAP#uid_store'
	from /opt/homebrew/Cellar/ruby/3.4.4/lib/ruby/3.4.0/forwardable.rb:240:in 'Imap::Backup::Client::Default#uid_store'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/client/automatic_login_wrapper.rb:28:in 'Imap::Backup::Client::AutomaticLoginWrapper#method_missing'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/account/folder.rb:137:in 'Imap::Backup::Account::Folder#set_flags'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:71:in 'block in Imap::Backup::Mirror#update_uids'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:64:in 'Array#each'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:64:in 'Imap::Backup::Mirror#update_uids'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:58:in 'block in Imap::Backup::Mirror#update_flags'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:57:in 'Array#each'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:57:in 'Enumerable#each_slice'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:57:in 'Imap::Backup::Mirror#update_flags'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/mirror.rb:24:in 'Imap::Backup::Mirror#run'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/cli/transfer.rb:48:in 'block in Imap::Backup::CLI::Transfer#run'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/account/folder_mapper.rb:43:in 'block in Imap::Backup::Account::FolderMapper#each'
	from <internal:dir>:412:in 'Dir.glob'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/account/folder_mapper.rb:39:in 'Pathname.glob'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/account/folder_mapper.rb:39:in 'Imap::Backup::Account::FolderMapper#each'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/cli/transfer.rb:45:in 'Imap::Backup::CLI::Transfer#run'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/cli.rb:137:in 'Imap::Backup::CLI#copy'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/thor-1.3.2/lib/thor/command.rb:28:in 'Thor::Command#run'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/thor-1.3.2/lib/thor/invocation.rb:127:in 'Thor::Invocation#invoke_command'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/thor-1.3.2/lib/thor.rb:538:in 'Thor.dispatch'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/thor-1.3.2/lib/thor/base.rb:584:in 'Thor::Base::ClassMethods#start'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/cli.rb:49:in 'Imap::Backup::CLI.start'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/bin/imap-backup:16:in 'block in <top (required)>'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/lib/imap/backup/logger.rb:58:in 'Imap::Backup::Logger.sanitize_stderr'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/gems/imap-backup-16.0.0/bin/imap-backup:15:in '<top (required)>'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/bin/imap-backup:25:in 'Kernel#load'
	from /opt/homebrew/Cellar/imap-backup/16.0.0/libexec/bin/imap-backup:25:in '<main>'

[joeyates]

Hi @realhik

It looks like all-inkl.com does not support the flag $NOTJUNK, which is supported by hosteurope.de.

You'll need to find a way to remove "$NOTJUNK" from the "flags" arrays in the backup .imap files.