Improve script 'debug-fetchmail' (#292)
Improve script 'debug-fetchmail' (#292)

The option '--check' checks for new mails without actually fetching
or deleting mail. Without '--check' 'debug-fetchmail' throws errors if
the external mail accout has new mails and the smtp daemon is not
running.
Narzhan/docker-smtp,tomav/docker-mailserver,alinmear/docker-mailserver,keslerm/docker-mailserver,tomav/docker-mailserver,tomav/docker-mailserver