I looked into the history of this. We used to have a patch in Debian to
use gethostbyname to address this issue. It was dropped because it
caused worse problems. Here's the relevant code snippet from the most
recent postfix release:
/*
* If the local machine name is not in FQDN form, try to append the
* contents of $mydomain. Use a default domain as a final workaround.
*
* DO NOT CALL GETHOSTBYNAME OR GETNAMEINFO HERE - IT MAKES EVERY POSTFIX
* PROGRAM HANG WHEN DNS SERVICE IS UNAVAILABLE. IF YOU DON'T LIKE THE
* DEFAULT, THEN EDIT MAIN.CF.
*/
name = get_hostname();
/* DO NOT CALL GETHOSTBYNAME OR GETNAMEINFO HERE - EDIT MAIN.CF */
if ((dot = strchr(name, '.')) == 0) {
/* DO NOT CALL GETHOSTBYNAME OR GETNAMEINFO HERE - EDIT MAIN.CF */
if ((domain = mail_conf_lookup_eval(VAR_MYDOMAIN)) == 0)
domain = DEF_MYDOMAIN;
/* DO NOT CALL GETHOSTBYNAME OR GETNAMEINFO HERE - EDIT MAIN.CF */
name = concatenate(name, ".", domain, (char *) 0);
}
/* DO NOT CALL GETHOSTBYNAME OR GETNAMEINFO HERE - EDIT MAIN.CF */
return (name);
So the way to resolve this issue is to edit main.cf as people have
indicated they are doing. "Fixing" this in postfix is not something we
should do.
** Changed in: postfix (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1657024
Title:
mydomain gets set to "localdomain"
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