imaplib - Moving mails to a folder fails without an error log - email

Question

My python code selects some mails and move them to another folder.
# A.py
def __init__(self):
account = conf.account
password = conf.password
server = conf.imap_server
port = conf.imap_port
self.mail = imaplib.IMAP4_SSL(host=server, port=port)
try:
self.mail.login(account, password)
except imaplib.IMAP4.error as e:
self.logger.error("Cannot login to STMP server: %s" % str(e))
def move_handled_mails(self, mail_list, suffix=0):
archiving_folder = ''.join([str(current_year), '-', str(current_month), '-', str(suffix)])
self.mail.debug = 4
typ, data = self.mail.select(archiving_folder)
if typ != 'OK':
if "NONEXISTENT" in data[0].decode():
self.mail.create(archiving_folder)
typ, data = self.mail.select(archiving_folder)
if "Too many mail in folder" in data[0].decode():
return self.move_handled_mails(mail_list, suffix+1)
if typ != 'OK':
exit()
for num in mail_list:
print(num)
typ, data = self.mail.uid('COPY', num, archiving_folder)
if typ == 'OK':
typ, data = self.mail.uid('STORE', num, '+FLAGS', '(\\Deleted)')
if typ != 'OK':
exit()
print("Executing expunge")
typ, data = self.mail.expunge()
if typ != 'OK':
exit()
def run(self):
res, nums = self.mail.select() # default=INBOX
if res != 'OK':
self.logger.error(nums)
exit()
typ, msgnums = self.mail.uid('search', None, 'ALL')
mail_list = msgnums[0].split()
self.move_handled_mails(mail_list)
At the move_handled_mails method, creating a folder works well, but moving mails doesn't work.
Moreover, when I print all the typs and datas, they are printed as OK and None repectively.
After running the code, no error occurs, but no mail is moved either.
What could be a problem, and how should I debug this problem?
Debug log after adding self.mail.debug=4:
Mail list: [b'7144291']
03:12.87 > b'GBDI2 SELECT 2021-11-0'
03:13.04 < b'* FLAGS (\\Answered \\Flagged \\Deleted \\Seen \\Draft)'
03:13.04 < b'* OK [PERMANENTFLAGS (\\Answered \\Flagged \\Deleted \\Seen \\Draft \\*)] Flags permitted.'
03:13.04 < b'* 13534 EXISTS'
03:13.04 < b'* 0 RECENT'
03:13.04 < b'* OK [UNSEEN 1] First unseen.'
03:13.04 < b'* OK [UIDVALIDITY 119] UIDs valid'
03:13.04 < b'* OK [UIDNEXT 7129395] Predicted next UID'
03:13.04 < b'* OK [NOMODSEQ] No permanent modsequences'
03:13.04 < b'GBDI2 OK [READ-WRITE] Select completed.'
b'7144291'
03:13.04 > b'GBDI3 UID COPY 7144291 2021-11-0'
03:13.16 < b'GBDI3 OK No messages copied.'
03:13.16 > b'GBDI4 UID STORE 7144291 +FLAGS (\\Deleted)'
03:13.30 < b'GBDI4 OK Store completed.'
Executing expunge
03:13.30 > b'GBDI5 EXPUNGE'
03:13.30 < b'GBDI5 OK Expunge completed.'

Answer 1

Don't select the folder you're moving to. UIDs are only meaningful in their source folder. You're switching to the destination folder, then trying to move a message out of it, and that message doesn't exist.
Remove this line:
typ, data = self.mail.select(archiving_folder)
Or, at least, if you need it to check that the destination folder exists, you must switch back to the source folder: self.mail.select('INBOX') or similar.