UID lists

All I wanted was an explanation of what 

  fetchmail: Old UID list from innovate.cs.queensu.ca:
   <empty>

  fetchmail: Scratch list of UIDs:
   <empty>

means but you want a full bug report.  OK, here it is:


Operating system: Centos 7
compiler version: gcc 4.8.5
SMTP listener: innovate.cs.queensu.ca with proto IMAP

% fetchmail -V
This is fetchmail release 6.4.8+SSL-SSLv2-TLS1.3+HESIOD+NLS.
WARNING: Your SSL/TLS library does not support TLS v1.3.

Copyright (C) 2002, 2003 Eric S. Raymond
Copyright (C) 2004 Matthias Andree, Eric S. Raymond,
                   Robert M. Funk, Graham Wilson
Copyright (C) 2005 - 2012 Sunil Shetye
Copyright (C) 2005 - 2020 Matthias Andree
Fetchmail comes with ABSOLUTELY NO WARRANTY. This is free software, and you
are welcome to redistribute it under certain conditions. For details,
please see the file COPYING in the source or documentation directory.
This product includes software developed by the OpenSSL Project
for use in the OpenSSL Toolkit. (http://www.openssl.org/)

Fallback MDA: (none)
Linux jimmy.tennent.ca 3.10.0-1127.13.1.el7.x86_64 #1 SMP Tue Jun 23 15:46:38 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Taking options from command line and /home/rdt/.fetchmailrc
Poll interval is 600 seconds
Idfile is /home/rdt/.fetchids
Fetchmail will forward misaddressed multidrop messages to rdt.
Options for retrieving from [email protected]:
  True name of server is innovate.cs.queensu.ca.
  Protocol is IMAP.
  All available authentication methods will be tried.
  SSL server certificate checking enabled.
  Server nonresponse timeout is 300 seconds (default).
  Default mailbox selected.
  Only new messages will be retrieved (--all off).
  Fetched messages will not be kept on the server (--keep off).
  Old messages will not be flushed before message retrieval (--flush off).
  Oversized messages will not be flushed before message retrieval (--limitflush off).
  Rewrite of server-local addresses is enabled (--norewrite off).
  Carriage-return stripping is disabled (stripcr off).
  Carriage-return forcing is disabled (forcecr off).
  Interpretation of Content-Transfer-Encoding is enabled (pass8bits off).
  MIME decoding is disabled (mimedecode off).
  Idle after poll is disabled (idle off).
  Nonempty Status lines will be kept (dropstatus off)
  Delivered-To lines will be kept (dropdelivered off)
  Fetch message size limit is 100 (--fetchsizelimit 100).
  Do binary search of UIDs during 3 out of 4 polls (--fastuidl 4).
  Messages will be SMTP-forwarded to: localhost (default)
  Single-drop mode: 1 local name recognized.
  No UIDs saved from this host.

% fetchmail --nodetach -vvv --nosyslog
Old UID list from innovate.cs.queensu.ca:
 <empty>

Scratch list of UIDs:
 <empty>

fetchmail: starting fetchmail 6.4.8 daemon
fetchmail: 6.4.8 querying innovate.cs.queensu.ca (protocol IMAP) at Wed 12 Aug 2020 02:02:01 PM EDT: poll started
Trying to connect to 130.15.1.11/143...connected.
fetchmail: IMAP< * OK [CAPABILITY IMAP4REV1 I18NLEVEL=1 LITERAL+ SASL-IR LOGIN-REFERRALS STARTTLS] innovate IMAP4rev1 2007f.404 at Wed, 12 Aug 2020 14:02:06 -0400 (EDT)
fetchmail: IMAP> A0001 CAPABILITY
fetchmail: IMAP< * CAPABILITY IMAP4REV1 I18NLEVEL=1 LITERAL+ IDLE UIDPLUS NAMESPACE CHILDREN MAILBOX-REFERRALS BINARY UNSELECT ESEARCH WITHIN SCAN SORT THREAD=REFERENCES THREAD=ORDEREDSUBJECT MULTIAPPEND SASL-IR LOGIN-REFERRALS STARTTLS
fetchmail: IMAP< A0001 OK CAPABILITY completed
fetchmail: Protocol identified as IMAP4 rev 1
fetchmail: IMAP> A0002 STARTTLS
fetchmail: IMAP< A0002 OK STARTTLS completed
fetchmail: SSL verify callback depth 2: preverify_ok == 1, err = 0, ok
fetchmail: Certificate chain, from root to peer, starting at depth 2:
fetchmail: Issuer Organization: DigiCert Inc
fetchmail: Issuer CommonName: DigiCert Global Root CA
fetchmail: Subject CommonName: DigiCert Global Root CA
fetchmail: SSL verify callback depth 1: preverify_ok == 1, err = 0, ok
fetchmail: Certificate at depth 1:
fetchmail: Issuer Organization: DigiCert Inc
fetchmail: Issuer CommonName: DigiCert Global Root CA
fetchmail: Subject CommonName: RapidSSL RSA CA 2018
fetchmail: SSL verify callback depth 0: preverify_ok == 1, err = 0, ok
fetchmail: Server certificate:
fetchmail: Issuer Organization: DigiCert Inc
fetchmail: Issuer CommonName: RapidSSL RSA CA 2018
fetchmail: Subject CommonName: *.cs.queensu.ca
fetchmail: Subject Alternative Name: *.cs.queensu.ca
fetchmail: innovate.cs.queensu.ca key fingerprint: 19:ED:EA:E8:5D:8B:B9:A0:09:FE:85:FC:B6:BC:B6:DE
fetchmail: SSL/TLS: using protocol TLSv1, cipher AES256-SHA, 256/256 secret/processed bits
fetchmail: IMAP> A0003 CAPABILITY
fetchmail: IMAP< * CAPABILITY IMAP4REV1 I18NLEVEL=1 LITERAL+ IDLE UIDPLUS NAMESPACE CHILDREN MAILBOX-REFERRALS BINARY UNSELECT ESEARCH WITHIN SCAN SORT THREAD=REFERENCES THREAD=ORDEREDSUBJECT MULTIAPPEND SASL-IR LOGIN-REFERRALS AUTH=PLAIN AUTH=LOGIN
fetchmail: IMAP< A0003 OK CAPABILITY completed
fetchmail: Protocol identified as IMAP4 rev 1
fetchmail: innovate.cs.queensu.ca: upgrade to TLS succeeded.
fetchmail: IMAP> A0004 LOGIN "rdt" *
fetchmail: IMAP< A0004 OK [CAPABILITY IMAP4REV1 I18NLEVEL=1 LITERAL+ IDLE UIDPLUS NAMESPACE CHILDREN MAILBOX-REFERRALS BINARY UNSELECT ESEARCH WITHIN SCAN SORT THREAD=REFERENCES THREAD=ORDEREDSUBJECT MULTIAPPEND] User rdt authenticated
fetchmail: selecting or re-polling default folder
fetchmail: IMAP> A0005 SELECT "INBOX"
fetchmail: IMAP< * 14 EXISTS
fetchmail: IMAP< * 1 RECENT
fetchmail: IMAP< * OK [UIDVALIDITY 1591704506] UID validity status
fetchmail: IMAP< * OK [UIDNEXT 7937] Predicted next UID
fetchmail: IMAP< * FLAGS (\Answered \Flagged \Deleted \Draft \Seen)
fetchmail: IMAP< * OK [PERMANENTFLAGS (\* \Answered \Flagged \Deleted \Draft \Seen)] Permanent flags
fetchmail: IMAP< * OK [UNSEEN 1] first unseen message in /var/mail/rdt
fetchmail: IMAP< A0005 OK [READ-WRITE] SELECT completed
fetchmail: 14 messages waiting after first poll
fetchmail: IMAP> A0006 EXPUNGE
fetchmail: IMAP< A0006 OK No messages deleted, so no update needed
fetchmail: 14 messages waiting after expunge
fetchmail: IMAP> A0007 SEARCH UNSEEN
fetchmail: IMAP< * SEARCH 1 2 3 4 5 6 7 8 9 10 11 12 13 14
fetchmail: 1 is unseen
fetchmail: 2 is unseen
fetchmail: 3 is unseen
fetchmail: 4 is unseen
fetchmail: 5 is unseen
fetchmail: 6 is unseen
fetchmail: 7 is unseen
fetchmail: 8 is unseen
fetchmail: 9 is unseen
fetchmail: 10 is unseen
fetchmail: 11 is unseen
fetchmail: 12 is unseen
fetchmail: 13 is unseen
fetchmail: 14 is unseen
fetchmail: IMAP< A0007 OK SEARCH completed
fetchmail: 1 is first unseen
14 messages for rdt at innovate.cs.queensu.ca.
fetchmail: IMAP> A0008 FETCH 1:14 RFC822.SIZE
^Cfetchmail: terminated with signal 2