&_/etc/krb5.keytab_&) but instead the pathname given in this option.
The value should be a pathname, with no &"file:"& prefix.
-.option server_realm heimdal_gssapi string&!! unset
-Er, unused. XXXFIXMEXXX
-
.option server_service heimdal_gssapi string&!! "smtp"
This option specifies the service identifier used, in conjunction with
&%server_hostname%&, for building the identifer for finding credentials