matej@mitmanek: ~$ klist -A
Ticket cache: KEYRING:persistent:1000:krb_ccache_PkA4uyo
Default principal: mcepl@REDHAT.COM

Valid starting     Expires            Service principal
05/02/18 11:44:57  05/02/18 21:42:25  HTTP/jira-01.host.prod.eng.rdu2.redhat.com@REDHAT.COM
05/02/18 11:44:54  05/02/18 21:42:25  HTTP/desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com@REDHAT.COM
05/02/18 11:43:21  05/02/18 21:42:25  imap/mail.corp.redhat.com@REDHAT.COM
05/02/18 11:42:25  05/02/18 21:42:25  krbtgt/REDHAT.COM@REDHAT.COM

Ticket cache: KEYRING:persistent:1000:krb_ccache_rnlG1Hq
Default principal: mcepl@FEDORAPROJECT.ORG

Valid starting     Expires            Service principal
05/02/18 20:59:02  06/02/18 20:59:00  krbtgt/FEDORAPROJECT.ORG@FEDORAPROJECT.ORG
matej@mitmanek: ~$ fetchmail --nosyslog --nodetach -vvv
The nodetach option is in effect, ignoring logfile option.
Old UID list from mail.corp.redhat.com: <empty>
Old UID list from redcrew.org: <empty>
Old UID list from redcrew.org: <empty>
Scratch list of UIDs: <empty>
fetchmail: 6.3.24 querying mail.corp.redhat.com (protocol IMAP) at Mon 05 Feb 2018 20:59:28 CET: poll started
Trying to connect to 10.4.203.66/993...connected.
fetchmail: Certificate chain, from root to peer, starting at depth 3:
fetchmail: Issuer Organization: Red Hat, Inc.
fetchmail: Issuer CommonName: Red Hat IT Root CA
fetchmail: Subject CommonName: Red Hat IT Root CA
fetchmail: Certificate at depth 2:
fetchmail: Issuer Organization: Red Hat, Inc.
fetchmail: Issuer CommonName: Red Hat IT Root CA
fetchmail: Subject CommonName: Intermediate Certificate Authority
fetchmail: Certificate at depth 1:
fetchmail: Issuer Organization: Red Hat
fetchmail: Issuer CommonName: Intermediate Certificate Authority
fetchmail: Subject CommonName: Certificate Authority
fetchmail: Server certificate:
fetchmail: Issuer Organization: Red Hat
fetchmail: Issuer CommonName: Certificate Authority
fetchmail: Subject CommonName: mail.corp.redhat.com
fetchmail: Subject Alternative Name: mail.corp.redhat.com
fetchmail: Subject Alternative Name: admin01.collab.prod.int.phx2.redhat.com
fetchmail: mail.corp.redhat.com key fingerprint: 0D:35:DE:96XXXXXXXXXXXXXXX9A:E8:86:39:54:20:52
fetchmail: mail.corp.redhat.com fingerprints match.
fetchmail: SSL/TLS: using protocol TLSv1.2, cipher DHE-RSA-AES256-GCM-SHA384, 256/256 secret/processed bits
fetchmail: IMAP< * OK IMAP4 ready
fetchmail: IMAP> A0001 CAPABILITY
fetchmail: IMAP< * CAPABILITY ACL BINARY CATENATE CHILDREN CONDSTORE ENABLE ESEARCH ID IDLE IMAP4rev1 LIST-EXTENDED LITERAL+ MULTIAPPEND NAMESPACE QUOTA RIGHTS=ektx SASL-IR SEARCHRES UIDPLUS UNSELECT WITHIN ESORT I18NLEVEL=1 SORT THREAD=ORDEREDSUBJECT LIST-STATUS XLIST AUTH=PLAIN AUTH=GSSAPI
fetchmail: IMAP< A0001 OK completed
fetchmail: Protocol identified as IMAP4 rev 1
fetchmail: GSSAPI error gss_inquire_cred: Unspecified GSS failure.  Minor code may provide more information
fetchmail: GSSAPI error gss_inquire_cred: Success
fetchmail: No suitable GSSAPI credentials found. Skipping GSSAPI authentication.
fetchmail: If you want to use GSSAPI, you need credentials first, possibly from kinit.
fetchmail: IMAP> A0002 LOGIN "mcepl" *
fetchmail: IMAP< A0002 NO LOGIN failed
fetchmail: Authorization failure on mcepl@mail.corp.redhat.com
fetchmail: For help, see http://www.fetchmail.info/fetchmail-FAQ.html#R15
fetchmail: IMAP> A0003 LOGOUT
fetchmail: IMAP< * BYE Zimbra IMAP server terminating connection
fetchmail: 6.3.24 querying mail.corp.redhat.com (protocol IMAP) at Mon 05 Feb 2018 20:59:40 CET: poll completed
Merged UID list from mail.corp.redhat.com: <empty>
fetchmail: Query status=3 (AUTHFAIL)
[...]
fetchmail: normal termination, status 1
matej@mitmanek: ~$