On Wed, Jul 05, 2017 at 04:13:38PM -0400, ryan wrote:
> I have recently switched from SSMTP to MSMTP because of problem with SSMTP
> and lack of support for it. Since switching to MSMTP any emails generated as
> a result of a cron job show as from just "root" instead of
> {user}@{fqdn}.domain.com.
>
> I have done some troubleshooting and it looks like MSMTP is properly setting
> the MAIL FROM: in the SMTP connection, however there is a "From" header that
> says "root (Cron Deamon)" which is possibly not getting changed properly
>
> If anyone has a suggestion on how to remedy this that would be great. If not
> perhaps a feature request to fix the headers as well as the SMTP MAIL FROM
>
> thanks
My solution for this is:
cp -a /usr/sbin/sendmail /usr/sbin/sendmail.real
cat <<END >/usr/sbin/sendmail
#!/bin/bash
LogOutput='y'
EmailOutput='y'
MailFrom='hostname-c...@example.com'
# Multiple addresses may be separated by commas
MailTo='hostname-c...@example.com'
# If 'n', $MailTo is prepended to the cron MAILTO
ReplaceMailTo='n'
# If 'y', unqualified addresses are removed from the cron MAILTO before
appending
DropUnqualifiedTo='y'
# Copy arguments to an array
Args=("$@")
# Determine whether we were called by cron
Cron='n'
for ArgNum in "${!Args[@]}" ; do
if [ "${Args[$ArgNum]}" = '-FCronDaemon' ] ; then
Cron='y'
break
fi
done
# If we were not called by cron, simply pass through to the real sendmail
if [ "$Cron" = 'n' ] ; then
/usr/sbin/sendmail.real "$@"
exit $?
fi
# If we get here, we were called by cron
Status=0
# Read STDIN into an environment variable so we can both log and email it
Input="$(cat)"
# Log the cron job's output (everything after the message headers)
if [ "$LogOutput" = 'y' ] ; then
echo "$Input" | perl -0777 -n -e '@i=split(/\n\n/, $_, 2); print($i[1]);' |
logger -p cron.warn --skip-empty
Status=$?
fi
if [ "$EmailOutput" = 'y' ] ; then
# Replace the From addresses
if [ -n "$MailFrom" ] ; then
Args[$ArgNum]="-F$MailFrom"
Input="$(echo "$Input" | perl -0777 -p -e "\$f='$MailFrom';" -e 's/^From:
root .*$/From: $f/m')"
fi
# Modify the To addresses
if [ -n "$MailTo" ] ; then
if [ "$ReplaceMailTo" = 'n' ] ; then
CronMailTo="${Args[-1]}"
if [ "$DropUnqualifiedTo" = 'y' ] ; then
CronMailTo="$(echo "$CronMailTo" | perl -n -e 'print join(",",
grep(/@/, split(/,/)));')"
fi
[ -n "$CronMailTo" ] && MailTo="$MailTo,$CronMailTo"
fi
Args[-1]="$MailTo"
Input="$(echo "$Input" | perl -0777 -p -e "\$t='$MailTo';" -e 's/^To:
.*$/To: $t/m')"
fi
# Send the email
echo "$Input" | /usr/sbin/sendmail.real "${Args[@]}"
Status=$?
fi
exit $Status
END
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