syntax in postfix

[giftsnake]

postfix/smtpd[5009]: connect from HOSTNAME[IP]
postfix/smtpd[5009]: 9024E20E1CD: client=HOSTNAME[IP], sasl_method=PLAIN, sasl_username=user@domain.com
postfix/cleanup[5034]: 9024E20E1CD: message-id=<A7922997-6A18-4878-88A6-E63ADF47547D@domain.com>
postfix/qmgr[18922]: 9024E20E1CD: from=<user@domain.com>, size=1094649, nrcpt=1 (queue active)
postfix/smtpd[5040]: connect from localhost[127.0.0.1]
postfix/smtpd[5040]: warning: Illegal address syntax from localhost[127.0.0.1] in MAIL command: <postmaster@${myhostname}>
amavis[374]: (00374-19) Negative SMTP resp. to DATA: 503 5.5.1 Error: need RCPT command
amavis[374]: (00374-19) (!)SEND via SMTP: <postmaster@${myhostname}> -> <user@domain.com>,ENVID=AM..20091120T123038Z@hostname.mailserver.com 501 5.1.7 Failed, id=00374-19, from MTA([127.0.0.1]:10025): 501 5.1.7 Bad sender address syntax
amavis[374]: (00374-19) (!)FAILED to notify recipient user@domain.com: 501 5.1.7 Failed, id=00374-19, from MTA([127.0.0.1]:10025): 501 5.1.7 Bad sender address syntax
amavis[374]: (00374-19) Blocked BANNED (multipart/mixed | application/x-msdownload,.exe,.exe-ms,testfile.exe | .exe,.exe-ms,TestFile.exe), [IP] [IP] <user@domain.com> -> <user@domain.com>, Message-ID: <A7922997-6A18-4878-88A6-E63ADF47547D@domain.com>, mail_id: yACTInXAm3W9, Hits: -, size: 1094649, 3502 ms
postfix/smtp[5035]: 9024E20E1CD: to=<user@domain.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=5, delays=1.4/0.02/0.01/3.5, dsn=2.5.0, status=sent (250 2.5.0 Ok, id=00374-19, DISCARD(bounce.suppressed))
postfix/qmgr[18922]: 9024E20E1CD: removed
postfix/smtpd[5040]: disconnect from localhost[127.0.0.1]

(the '{myhostname}' is in exactly that way in the mail.log)

i dont understand, why the first 3 'amavis' lines give me an error.

my filter for *.exe files:

(what is shown in the list of filters)

/^Content-(Disposition|Type).*names*=s*”?(.*.(bat|exe|scr))(?=)?”?s*(;|$)/x

(what i typed in the field before saving)

/^Content-(Disposition|Type).*name\s*=\s*”?(.*\.(bat|exe|scr))(\?=)?”?\s*(;|$)/x

please help to avoid this errormessage.
thanks in advance, giftsnake

[giftsnake]

hm, nobody with an idea?