Unable to move mail to another folder

imlonghao · June 4, 2025, 9:19am

Hello,

I’m new to eM Client, and I added two mail account to it. One works well, but another seem weird.

I can’t move email from Index to any other folder like Trash/Junk, not to mention Archive.

It shows an error dialog with “Upload to this folder is not allowed.”

But I can move email between folders with Thunderbird.

Any idea? I’m using eM Client 10.3.2040 (31d09e4) on Mac

cyberzork · June 5, 2025, 3:44am

I can’t move email from Index to any other folder like Trash/Junk, not to mention Archive.

It shows an error dialog with “Upload to this folder is not allowed.

Upload to this Folder is not allowed possibly sounds like a eg: Read only “server account folder”.

Can you move email “to any other mail account folders” apart from Trash / Junk and Archive ?

Also what type of mail account is this eg: IMAP, Exchange, Office 365 or iCloud account? and which mail server are you with?

imlonghao · June 5, 2025, 6:23am

Thanks for your reply.

I created two folder test and test2, I can move the email from INBOX to test, and move it between test and test2.

But, after I restart the eM Client, I’m no longer able to move email into test, nor test2. It showed the same error “Upload to this folder is not allowed.”

I’m using IMAP with maddy as mail server.

I tried to debug it by using Python imaplib, but I can’t see anything that can cause this problem.

# Not Working Mailserver
>>> import imaplib
>>> s=imaplib.IMAP4_SSL('mail.example.com') # domain masked
>>> s.login('[email protected]', 'password')
('OK', [b'[CAPABILITY IMAP4rev1 LITERAL+ SASL-IR CHILDREN UNSELECT MOVE IDLE APPENDLIMIT I18NLEVEL=1 SORT THREAD=ORDEREDSUBJECT COMPRESS NAMESPACE] LOGIN completed'])
>>> s.list()
('OK', [b'(\\HasNoChildren) "." INBOX', b'(\\Sent \\HasNoChildren) "." "Sent"', b'(\\Trash \\HasNoChildren) "." "Trash"', b'(\\Junk \\HasNoChildren) "." "Junk"', b'(\\Drafts \\HasNoChildren) "." "Drafts"', b'(\\Archive \\HasNoChildren) "." "Archive"', b'(\\HasNoChildren) "." "test"', b'(\\HasNoChildren) "." "test2"'])
>>> s.capabilities
('IMAP4REV1', 'LITERAL+', 'SASL-IR', 'CHILDREN', 'UNSELECT', 'MOVE', 'IDLE', 'APPENDLIMIT', 'AUTH=PLAIN', 'COMPRESS')

# A Working Mailserver
>>> import imaplib
>>> s=imaplib.IMAP4_SSL('eu1.example.net')  # domain masked
>>> s.login('[email protected]', 'password')
('OK', [b'LOGIN completed'])
>>> s.list()
('OK', [b'(\\Marked \\HasNoChildren \\INBOX) "/" "INBOX"', b'(\\Marked \\HasNoChildren \\Trash) "/" "Deleted Items"', b'(\\Marked \\HasNoChildren \\Sent) "/" "Sent Items"', b'(\\Marked \\HasNoChildren \\Junk) "/" "Junk E-Mail"', b'(\\Marked \\HasNoChildren \\Drafts) "/" "Drafts"'])
>>> s.capabilities
('IMAP4REV1', 'AUTH=CRAM-MD5', 'AUTH=NTLM', 'AUTH=PLAIN', 'SASL-IR', 'UTF8=ACCEPT', 'UIDPLUS', 'QUOTA', 'MOVE', 'XLIST', 'CHILDREN', 'ENABLE', 'CONDSTORE', 'X-SM-TAGS', 'IDLE')

cyberzork · June 5, 2025, 7:20am

I created two folder test and test2, I can move the email from INBOX to test, and move it between test and test2.

But, after I restart the eM Client, I’m no longer able to move email into test, nor test2. It showed the same error “Upload to this folder is not allowed.

Ok I see. Might be something specific with your particular IMAP server being it also happens with brand new IMAP account Test folders.

I would recommend then to find out, if you have a current active paid Pro or Personal version, to go to the VIP support page and login and lodge a support ticket to be investigated.

If you do login and lodge a support ticket, “include your full operations log”, via clicking the drop-down on the right of Refresh and click Show Operations. Then click the Log tab at the top.

imlonghao · June 5, 2025, 7:45am

Thanks, ticket created #174440.

imlonghao · June 6, 2025, 2:36pm

After investigation from eM Client team, this has identified as a bug in maddy with APPENDLIMIT flag.

github.com/foxcpp/maddy

Bug report: IMAP APPENDLIMIT behave chaos

opened 02:22PM - 06 Jun 25 UTC

imlonghao

bug

# Describe the bug IMAP APPENDLIMIT settings behave in effected, conflict with …maddy settings. # Steps to reproduce 1. Run maddy in Docker as instructed in https://maddy.email/docker/ 2. Create a `creds` and `imap-acct` for an account 3. Now we can expect this account has no LIMIT (NIL) with APPENDLIMIT because account and mboxes are both has no limit. ``` # docker exec -it maddy maddy imap-acct appendlimit [email protected] No limit # sqlite3 imapsql.db 'select * from mboxes where msgsizelimit is null' 1|1|INBOX|1|0||7|1439825317||5 2|1|Sent|1|0||1|3335251900|\Sent|0 3|1|Trash|1|0||1|3434545230|\Trash|0 4|1|Junk|1|0||1|418662061|\Junk|0 5|1|Drafts|1|0||1|1872697851|\Drafts|0 6|1|Archive|1|0||2|556772642|\Archive|0 ``` 4. But in effect, this account has an APPENDLIMIT to ZERO ``` # python >>> import imaplib >>> s=imaplib.IMAP4_SSL('127.0.0.1') >>> s.login('[email protected]', 'foxcpp') ('OK', [b'[CAPABILITY IMAP4rev1 LITERAL+ SASL-IR CHILDREN UNSELECT MOVE IDLE APPENDLIMIT I18NLEVEL=1 SORT THREAD=ORDEREDSUBJECT COMPRESS NAMESPACE] LOGIN completed']) >>> s.status('INBOX', '(APPENDLIMIT)') ('OK', [b'INBOX (APPENDLIMIT 0)']) ``` According to [RFC7889 The IMAP APPENDLIMIT Extension](https://www.rfc-editor.org/rfc/rfc7889.html), the `APPENDLIMIT` flag in `s.login()` indicates server support this extension and client will need to discover upload limits for each mailbox. And the STATUS Response indicates server will not accept any APPEND commands at all for the affected mailboxes. I am expecting to see the following STATUS response, which indicates the mailbox has no limit. ``` >>> s.status('INBOX', '(APPENDLIMIT)') ('OK', [b'INBOX (APPENDLIMIT NIL)']) ``` # Log files No need # Configuration file Exactly same as https://github.com/foxcpp/maddy/blob/fa47d40f6d510a431d2bbc238c7d36a58774ae2f/maddy.conf.docker # Environment information * maddy version: 0.8.1

For now, you can manually set an appendlimit value to fix.

maddy imap-acct appendlimit -v 33554432 USERNAME