imap4.error

[jasonjiangxinhui]

when I use letter instead of numbers it will ok. but when I use number email got a problem report below:
case = imbox.messages(sent_from='[email protected]')

UID command error: BAD [b'Could not parse command']
File "D:\python\test\test1.py", line 9, in
case = imbox.messages(sent_from='[email protected]')

sent_from='[email protected]' got report an issue,
sent_from='[email protected]' this is fine, ok