Phabricator daemons are eternally failing to send a mail message on my server because the message is too big.
```
[2015-11-16 15:19:35] EXCEPTION: (PhutilProxyException) Error while executing Task ID 847959. {>} (CommandException) Command failed with error #75!
COMMAND
/usr/sbin/sendmail -oi -t
STDOUT
(empty)
STDERR
postdrop: warning: uid=501: File too large
sendmail: fatal: osystem(501): message file too big
at [<phutil>/src/future/exec/ExecFuture.php:416]
arcanist(head=master, ref.master=66ab1c955d27), phabricator(head=master, ref.master=26a235ab8a18), phutil(head=master, ref.master=e9ed72483a14)
#0 <#2> ExecFuture::resolvex() called at [<phabricator>/externals/phpmailer/class.phpmailer-lite.php:540]
#1 <#2> PHPMailerLite::SendmailSend(string, string) called at [<phabricator>/externals/phpmailer/class.phpmailer-lite.php:499]
#2 <#2> PHPMailerLite::Send() called at [<phabricator>/src/applications/metamta/adapter/PhabricatorMailImplementationPHPMailerLiteAdapter.php:104]
#3 <#2> PhabricatorMailImplementationPHPMailerLiteAdapter::send() called at [<phabricator>/src/applications/metamta/storage/PhabricatorMetaMTAMail.php:733]
#4 <#2> PhabricatorMetaMTAMail::sendNow() called at [<phabricator>/src/applications/metamta/PhabricatorMetaMTAWorker.php:26]
#5 <#2> PhabricatorMetaMTAWorker::doWork() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorWorker.php:122]
#6 <#2> PhabricatorWorker::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php:171]
#7 <#2> PhabricatorWorkerActiveTask::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorTaskmasterDaemon.php:22]
#8 PhabricatorTaskmasterDaemon::run() called at [<phutil>/src/daemon/PhutilDaemon.php:183]
#9 PhutilDaemon::execute() called at [<phutil>/scripts/daemon/exec/exec_daemon.php:125]
```