Nice to know that not all apps happen to be affected, but... now what ??????
How about Outlook and Thunderbird (which are affected), is that credible enough?
If not, iOS Mail is also broken:
https://answers.yahoo.com/question/index?qid=20150401142018AA9z6baEach mail app has its own mail sync algorithms. Some issues with some servers affect some mail apps but not others.
And there may be cases where some mail service issue affects, let's say, K9 Mail, or Outlook, but not Aqua -- but you won't read about it on this forum.
If Yahoo claims to support "The IMAP mail access protocol for use by third party mail apps", then that comes with certain obligations.
They have to conform to certain specs, and provide certain data in return to certain commands.
I have not seen any debug logs from *you*, but got a couple from other users when the issue was in full swing...
...and posted a detailed technical analysis on Yahoo's support forums.
Can't find it there now, and most of other users' messages are gone, cleaned up I guess.
I'll just give a very short summary:
The UID values referring to same messages -- differ when returned by different commands:
FETCH x:y (UID FLAGS)
and
FETCH x:y (UID BODY.PEEK[HEADER.FIELDS (
DATE MESSAGE-ID LIST-ID SUBJECT FROM REPLY-TO TO CC BCC X-PRIORITY RESENT-FROM
REFERENCES DISPOSITION-NOTIFICATION-TO CONTENT-TYPE
)] BODYSTRUCTURE RFC822.SIZE INTERNALDATE)
If anyone at Yahoo Support / Yahoo Engineering gives a shit, then those two lines of gibberish will actually make sense to them.
If not, then it doesn't matter.
