https://bugs.gentoo.org/922477
https://github.com/cronie-crond/cronie/issues/166
https://github.com/cronie-crond/cronie/issues/170
https://github.com/cronie-crond/cronie/pull/118

https://github.com/cronie-crond/cronie/commit/aeb3f8a9cbc0da7e6367d41a2b769eb7e90855f3
https://github.com/cronie-crond/cronie/commit/6181605fafe6aaedc0c19a8bdc85a335403b42d8

From aeb3f8a9cbc0da7e6367d41a2b769eb7e90855f3 Mon Sep 17 00:00:00 2001
From: Tomas Mraz <tmraz@fedoraproject.org>
Date: Fri, 19 Jan 2024 11:17:48 +0100
Subject: [PATCH] Revert "Use empty envelope address with default mailfrom"

This reverts commit c640f4f39e5c20995e960e4b954cd0574a96c028.

This causes more harm than expected and is also strictly speaking
not RFC compliant.
--- a/src/do_command.c
+++ b/src/do_command.c
@@ -471,9 +471,7 @@ static int child_process(entry * e, char **jobenv) {
 				if (MailCmd[0] == '\0') {
 					int len;
 
-					/* Use empty envelope address with default mailfrom */
-					len = snprintf(mailcmd, sizeof mailcmd, MAILFMT, MAILARG,
-							mailfrom == e->pwd->pw_name ? "<>" : mailfrom);
+					len = snprintf(mailcmd, sizeof mailcmd, MAILFMT, MAILARG, mailfrom);
 					if (len < 0) {
 						fprintf(stderr, "mailcmd snprintf failed\n");
 						(void) _exit(ERROR_EXIT);

From 6181605fafe6aaedc0c19a8bdc85a335403b42d8 Mon Sep 17 00:00:00 2001
From: Tomas Mraz <tmraz@fedoraproject.org>
Date: Fri, 19 Jan 2024 11:19:32 +0100
Subject: [PATCH] Inherit MAILFROM from the crond process environment

This allows setting it in /etc/sysconfig/crond or in the systemd unit.
--- a/man/crontab.5
+++ b/man/crontab.5
@@ -98,7 +98,8 @@ This option is useful if you decide to use /bin/mail instead of
 aliasing and UUCP usually does not read its mail.  If
 .I MAILFROM
 is defined (and non-empty), it is used as the envelope sender address,
-otherwise, ``root'' is used.
+otherwise, ``root'' is used. This variable is also inherited from the
+crond process environment.
 .PP 
 (Note: Both 
 .I MAILFROM
--- a/src/env.c
+++ b/src/env.c
@@ -138,6 +138,7 @@ int env_set_from_environ(char ***envpp) {
 		"LC_ALL",
 		"LANGUAGE",
 		"RANDOM_DELAY",
+		"MAILFROM",
 		NULL
 	};
 	const char **name;