logout/back raises failure in restarting the mail service

Log:

2013-09-18 09:38:25,823 - leap.bitmask.crypto.srpauth - DEBUG - Starting logout...
2013-09-18 09:38:25,825 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:25,826 - leap.bitmask.gui.mainwindow - DEBUG - Stopping imap service.
2013-09-18 09:38:25,830 - leap.bitmask.gui.mainwindow - DEBUG - Stopping smtp service.
2013-09-18 09:38:25,831 - leap - DEBUG - 2013-09-18 09:38:25-0400 [-] Stopping factory 
2013-09-18 09:38:29,956 - leap.bitmask.crypto.srpauth - DEBUG - Successfully logged out.
2013-09-18 09:38:33,995 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Checking name resolution for dev.bitmask.net
2013-09-18 09:38:34,314 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Checking https for dev.bitmask.net
2013-09-18 09:38:36,755 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Downloading provider info for dev.bitmask.net
2013-09-18 09:38:36,786 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:36,787 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Requesting for provider.json... uri: https://api.dev.bitmask.net:4430/provider.json, verify: /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem, headers: {'if-modified-since': 'Wed Jul 31 21:33:57 2013 GMT'}
2013-09-18 09:38:40,530 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Request status code: 304
2013-09-18 09:38:40,531 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Provider definition has not been modified
2013-09-18 09:38:40,534 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Downloading ca cert for dev.bitmask.net at https://dev.bitmask.net/ca.crt
2013-09-18 09:38:40,537 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:40,539 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Checking ca fingerprint for dev.bitmask.net and cert /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:40,543 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:40,544 - leap.bitmask.services.eip.providerbootstrapper - DEBUG - Checking api certificate for https://api.dev.bitmask.net:4430 and cert /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:40,547 - leap.bitmask.crypto.srpauth - DEBUG - Authentication preprocessing...
2013-09-18 09:38:40,549 - leap.bitmask.crypto.srpauth - DEBUG - Starting authentication process...
2013-09-18 09:38:40,552 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:43,204 - leap.bitmask.crypto.srpauth - DEBUG - Processing challenge...
2013-09-18 09:38:43,213 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:43,858 - leap.bitmask.crypto.srpauth - DEBUG - Verifying session...
2013-09-18 09:38:43,860 - leap.bitmask.crypto.srpauth - DEBUG - Session verified.
2013-09-18 09:38:43,872 - leap.bitmask.crypto.srpauth - DEBUG - Successful login!
2013-09-18 09:38:44,880 - leap.bitmask.services.soledad.soledadbootstrapper - DEBUG - Downloading Soledad config for dev.bitmask.net
2013-09-18 09:38:44,882 - leap.bitmask.services.soledad.soledadbootstrapper - DEBUG - Downloading soledad config from: https://api.dev.bitmask.net:4430/1/config/soledad-service.json
2013-09-18 09:38:44,883 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:38:49,393 - leap.bitmask.services.soledad.soledadbootstrapper - DEBUG - Soledad definition has not been modified
2013-09-18 09:38:49,423 - leap.bitmask.services.soledad.soledadbootstrapper - DEBUG - Using soledad server url: https://clam.dev.bitmask.net:2323/user-f74ccf0aa010f34d44c22fe034fdfd0a
2013-09-18 09:38:49,430 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:39:04,575 - leap.bitmask.services.soledad.soledadbootstrapper - DEBUG - Retrieving key for testmail@dev.bitmask.net
2013-09-18 09:39:04,577 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:39:04,627 - leap.bitmask.gui.mainwindow - DEBUG - Done bootstrapping Soledad
2013-09-18 09:39:04,628 - leap.bitmask.gui.mainwindow - DEBUG - Starting imap service
2013-09-18 09:39:04,628 - leap.bitmask.services.mail.imap - DEBUG - Launching imap service
2013-09-18 09:39:04,631 - leap.bitmask.services.mail.imap - WARNING - BAD value found for BITMASK_MAILCHECK_PERIOD: None
2013-09-18 09:39:04,639 - leap.mail.imap.service.imap - ERROR - IMAP Service failed to start: cannot listen in port 1984
2013-09-18 09:39:04,665 - leap.bitmask.services.mail.smtpbootstrapper - DEBUG - Downloading SMTP config for dev.bitmask.net
2013-09-18 09:39:04,666 - leap.bitmask.services.mail.smtpbootstrapper - DEBUG - Downloading SMTP config from: https://api.dev.bitmask.net:4430/1/config/smtp-service.json
2013-09-18 09:39:04,667 - leap.bitmask.config.providerconfig - DEBUG - Going to verify SSL against /home/kali/.config/leap/providers/dev.bitmask.net/keys/ca/cacert.pem
2013-09-18 09:39:07,234 - leap.bitmask.services.mail.smtpbootstrapper - DEBUG - SMTP definition has not been modified
2013-09-18 09:39:07,247 - leap.bitmask.gui.mainwindow - DEBUG - Done bootstrapping SMTP
2013-09-18 09:39:07,247 - leap.bitmask.gui.mainwindow - DEBUG - Using hostname starfish for SMTP
2013-09-18 09:39:07,250 - leap.bitmask.services.eip.eipconfig - DEBUG - Using OpenVPN cert /home/kali/.config/leap/providers/dev.bitmask.net/keys/client/openvpn.pem
2013-09-18 09:39:07,259 - leap.mail.smtp - ERROR - STMP Service failed to start: cannot listen in port 587

Notice the wrong port on the last line.

(from redmine: created on 2013-09-18, closed on 2013-10-04, relates #3774 (closed))