tags 694686 + patch kthxbye I've attached a patch that does the minimum necessary to fix the problem. It passes the -B8BITMIME option, which is supported by every /usr/sbin/sendmail implementation I can find, and adds a MIME-Version header. It also sets the Content-Transfer-Encoding to 8bit if no such header is already present.
This is the minimum necessary for cron to properly send 8-bit emails. I'm running it on my server and have seen no problems with it. -- brian m. carlson / brian with sandals: Houston, Texas, US +1 832 623 2791 | http://www.crustytoothpaste.net/~bmc | My opinion only OpenPGP: RSA v4 4096b: 88AC E9B2 9196 305B A994 7552 F1BA 225C 0223 B187
commit 1c9ebe291e3b837ec10734fc8c37211e792d9ad5
Author: brian m. carlson <sand...@crustytoothpaste.net>
Date: Wed Apr 30 23:35:25 2014 +0000
Send proper 8-bit emails.
Cron sends 8-bit emails, so it needs to send these mails as 8BITMIME. This
involves passing -B8BITMIME so that sendmail knows what kind of data to
expect, as well as sending an appropriate MIME-Version and
Content-Transfer-Encoding header.
Without these changes, mail servers that reject non-MIME 8-bit emails will
reject cron's messages.
diff --git a/config.h b/config.h
index cb10abd..611a335 100644
--- a/config.h
+++ b/config.h
@@ -44,7 +44,7 @@
#define MAILCMD _PATH_SENDMAIL /*-*/
/* #define MAILARGS "%s -i -FCronDaemon -odi -oem %s" /*-*/
-#define MAILARGS "%s -i -FCronDaemon -oem %s" /*-*/
+#define MAILARGS "%s -i -FCronDaemon -B8BITMIME -oem %s" /*-*/
/* -i = don't terminate on "." by itself
* -Fx = set full-name of sender
* -odi = Option Deliverymode Interactive
diff --git a/do_command.c b/do_command.c
index 18d097d..9f7240a 100644
--- a/do_command.c
+++ b/do_command.c
@@ -567,6 +567,7 @@ child_process(e, u)
fprintf(mail, "Date: %s\n",
arpadate(&StartTime));
# endif /* MAIL_DATE */
+ fprintf(mail, "MIME-Version: 1.0\n");
if ( content_type == 0L ) {
fprintf(mail, "Content-Type: text/plain; charset=%s\n",
cron_default_mail_charset
@@ -595,6 +596,8 @@ child_process(e, u)
fprintf(mail,"Content-Transfer-Encoding: %s\n",
content_transfer_encoding);
}
+ else
+ fprintf(mail, "Content-Transfer-Encoding: 8bit\n");
for (env = e->envp; *env; env++)
fprintf(mail, "X-Cron-Env: <%s>\n",
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