[Exim] strange errors in logfile concerned with systemfilter…

Sirs, i've just opened for myself eximstats, and it shows me:

    1 spam@??? <system-filter> R=local_user
            T=mail_spool: SMTP error from remote mailer after MAIL

FROM:<\316\316\316_\313\345\362\360\345\351\344_@???>
            SIZE=5499: host 127.0.0.1 [127.0.0.1]: 501 5.5.4 Syntax
            error in parameters

    1 spam@??? <system-filter> R=local_user
            T=mail_spool: SMTP error from remote mailer after MAIL

FROM:<\316\316\316_\313\345\362\360\345\351\344_@???>
            SIZE=5453: host 127.0.0.1 [127.0.0.1]: 501 5.5.4 Syntax
            error in parameters

And such errors are only shown on when message is redirected by system
filter, when local delivery occurs -- nothing goes wrong.

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Michael V. Sokolov, SA/Helpdesk