root@imap:~/imapsync# imapsync --host1 imap.mail.yahoo.com --user1 dramith@xtra.co.nz --passfile1 password1.txt --ssl1 --host2 imap.gmail.com --user2 johay.amith@gmail.com --passfile2 password1.txt --ssl2
Transfer started at Sat Jun 27 00:29:39 2015
PID is 15720
Log file is LOG_imapsync/2015_06_27_00_29_39_johay.amith@gmail.com.txt  ( to change it, use --logfile filepath ; or use --nolog to turn off logging )
$RCSfile: imapsync,v $ $Revision: 1.637 $ $Date: 2015/04/01 01:36:37 $
Here is a [linux] system (Linux imap 3.13.0-52-generic #85-Ubuntu SMP Wed Apr 29 16:44:17 UTC 2015 x86_64)
With perl 5.18.2 Mail::IMAPClient  3.35
Command line used:
/usr/bin/imapsync --host1 imap.mail.yahoo.com --user1 dramith@xtra.co.nz --passfile1 password1.txt --ssl1 --host2 imap.gmail.com --user2 johay.amith@gmail.com --passfile2 password2.txt --ssl2
Temp directory is /tmp  ( to change it use --tmpdir dirpath )
PID file is /tmp/imapsync.pid ( to change it use --pidfile filepath ; to avoid it use --pidfile "" )
Modules version list:
Mail::IMAPClient     3.35
IO::Socket           1.36
IO::Socket::IP       ?
IO::Socket::INET     1.33
IO::Socket::SSL      1.965
Net::SSLeay          1.58
Compress::Zlib       2.063
Digest::MD5          2.52
Digest::HMAC_MD5     1.01
Digest::HMAC_SHA1    1.03
Term::ReadKey        2.31
File::Spec           3.40
Time::HiRes          1.9725
Unicode::String      2.09
IO::Tee              0.64
File::Copy::Recursive 0.38
Authen::NTLM         1.09
URI::Escape          3.31
Data::Uniqid         0.12
( use --no-modules_version to turn off printing this Perl modules list )
Info: turned ON syncinternaldates, will set the internal dates (arrival dates) on host2 same as host1.
Info: will try to use LOGIN authentication on host1
Info: will try to use LOGIN authentication on host2
Info: imap connexions timeout is 120 seconds
Host1: IMAP server [imap.mail.yahoo.com] port [993] user [dramith@xtra.co.nz]
Host2: IMAP server [imap.gmail.com] port [993] user [johay.amith@gmail.com]
Host1: * OK [CAPABILITY IMAP4rev1 ID NAMESPACE X-ID-ACLID UIDPLUS LITERAL+ CHILDREN XAPPLEPUSHSERVICE XYMHIGHESTMODSEQ AUTH=PLAIN AUTH=LOGIN AUTH=XOAUTH2 AUTH=XYMCOOKIE AUTH=XYMECOOKIE AUTH=XYMCOOKIEB64 AUTH=XYMPKI] IMAP4rev1 imapgate-1.8.1_01.20166 imap505.mail.bf1.yahoo.com
Host1: imap.mail.yahoo.com says it has CAPABILITY for AUTHENTICATE LOGIN
Host1: success login on [imap.mail.yahoo.com] with user [dramith@xtra.co.nz] auth [LOGIN]
Host2: * OK Gimap ready for requests from 45.55.248.226 b5mb135256616qgb
Host2: imap.gmail.com says it has NO CAPABILITY for AUTHENTICATE LOGIN
Failure: error login on [imap.gmail.com] with user [johay.amith@gmail.com] auth [LOGIN]: 2 NO [ALERT] Please log in via your web browser: https://support.google.com/mail/accounts/answer/78754 (Failure)