some envvar pingpong

scripts/fetch-mails.sh

@@ -1,10 +1,10 @@
 #!/bin/bash
 
 # Email-address of the system
-mail_address="${REDMINE_IMAP_ADDRESS}"
+mail_address="${REDMINE_IMAP_USER}"
 
 # Email-Account username and password
-mail_username="$mail_address"
+mail_username="${REDMINE_IMAP_USERNAME:-"$mail_address"}"
 mail_password="${REDMINE_IMAP_PASSWORD}"
 
 # IMAP-Server address and port