The gist of this short post is: check the values of DEBEMAIL and DEBFULLNAME environment variables before running the build.
And of course you can set them with a simple export command.
From dch man page:
If either --increment or --newversion is used, the name and email for the new version will be determined as follows. If the environment variable DEBFULLNAME is set, this will be used for the maintainer full name; if not, then NAME will be checked. If the environment variable DEBEMAIL is set, this will be used for the email address. If this variable has the form "name
", then the maintainer name will also be taken from here if neither DEBFULLNAME nor NAME is set. If this variable is not set, the same test is performed on the environment variable EMAIL. Next, if the full name has still not been determined, then use getpwuid(3) to determine the name from the password file. If this fails, use the previous changelog entry. For the email address, if it has not been set from DEBEMAIL or EMAIL, then look in /etc/mail- name, then attempt to build it from the username and FQDN, otherwise use the email address in the previous changelog entry. In other words, it's a good idea to set DEBEMAIL and DEBFULLNAME when using this script.