FairEmail/tools/zoho.log

There is a bug in the Zoho IMAP server causing all messages to be returned when searching for messages by flag (UNSEEN, FLAGGED, etc), despite specifying a SINCE.

This causes all messages to be synchronized/downloaded, causing a lot of unnecessary traffic for both the user (inconveniently hitting rate limits as well) and for your servers.

See attachment for a protocol log demonstrating this rather serious issue.

The log was captured using imap.zoho.eu


07-24 17:07:32.020 26182 27215 I System.out: BG25 SEARCH OR SINCE 23-Jul-2019 (UNSEEN) ALL
07-24 17:07:32.034 26182 27215 I System.out: * SEARCH 1
07-24 17:07:32.034 26182 27215 I System.out: BG25 OK Success
07-24 17:07:32.035 26182 27214 I System.out: BG26 IDLE
07-24 17:07:32.041 26182 27214 I System.out: + idling
07-24 17:07:32.041 26182 27215 I System.out: DONE
07-24 17:07:32.052 26182 27214 I System.out: BG26 OK IDLE terminated
07-24 17:07:32.053 26182 27215 I System.out: BG27 FETCH 1 (FLAGS UID)
07-24 17:07:32.093 26182 27215 I System.out: * 1 FETCH (FLAGS (\Recent \Seen) UID 3)
07-24 17:07:32.093 26182 27215 I System.out: BG27 OK Success
07-24 17:07:32.093 26182 27214 I System.out: BG28 IDLE
07-24 17:07:32.103 26182 27214 I System.out: + idling
07-24 17:07:32.104 26182 27215 I System.out: DONE
07-24 17:07:32.110 26182 27214 I System.out: BG28 OK IDLE terminated
07-24 17:07:32.110 26182 27215 I System.out: BG29 FETCH 1 (ENVELOPE INTERNALDATE RFC822.SIZE FLAGS BODYSTRUCTURE UID BODY.PEEK[HEADER] RFC822.SIZE INTERNALDATE)
07-24 17:07:32.127 26182 27215 I System.out: * 1 FETCH (FLAGS (\Recent \Seen) INTERNALDATE "08-Jul-2019 23:10:22 +0000" ... redacted

07-24 17:48:15.563 27990 28576 I System.out: * CAPABILITY IMAP4rev1 UNSELECT CHILDREN XLIST NAMESPACE IDLE MOVE ID AUTH=PLAIN SASL-IR UIDPLUS ESEARCH LIST-EXTENDED LIST-STATUS WITHIN LITERAL- APPENDLIMIT=10485760