[Exim] smtp_etrn_hosts

Hi all,
I'm trying to get my mail server to accept the ETRN command, but when
I put the following in the exim config file,
smtp_etrn_hosts = mail.example.com, exim fails to start with the
following error.

2004-02-23 11:13:31 Exim configuration error in line 229:
main option "smtp_etrn_hosts" unknown

I've read the exim documentations and searched on google with no luck.
Thanks in advance for you help.

-- idris + (234) 8033768151

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