Empty MAIL FROM - ReadList.com

11 msg	(noob-newbie here) Configuring postfix to be us...
5 msg	(No Subject)
3 msg	When is 'for <recipient>'present in header?
2 msg	client does not detect mail

Empty MAIL FROM
\ Jaroslaw Bazydlo (16 Apr 2007)
. \ Ralf Hildebrandt (16 Apr 2007)
. \ mouss (16 Apr 2007)
. \ Черкендов Алекса� (16 Apr 2007)
. . \ Mark Martinec (16 Apr 2007)
. . . \ mouss (16 Apr 2007)
. . . \ Noel Jones (16 Apr 2007)
. \ Черкендов Алекса� (16 Apr 2007)
. . \ mouss (16 Apr 2007)
. . . \ Victor Duchovni (16 Apr 2007)
. . \ Noel Jones (16 Apr 2007)

3 msg	Change format of emails in active directory
3 msg	Logging a message from within a restriction list
4 msg	mailbox_transport_maps lookup key
10 msg	mailbox_transport_maps problem
5 msg	Default value of unknown_address_reject_code
9 msg	Issue with using LDAP for transport maps
4 msg	limit max. used bandwith?
2 msg	maximum number of smtpd_restriction_classes
5 msg	'transport_maps' getting ignored?
3 msg	Server configuration problem
6 msg	smtpd_sasl_auth_enable is true, but SASL suppor...
3 msg	Mail to local domains
2 msg	nonexistent virtual account received
13 msg	How to make postfix use one IP for receiving an...
3 msg	ldap search fails

Subject:	Empty MAIL FROM
Group:	Postfix-users
From:	Jaroslaw Bazydlo
Date:	16 Apr 2007

Guys,

Postfix disallows empty MAIL FROM: but accept the one with simple "<>"
argument. I understand why not to accept empty one but simply do not
know why to accept "<>" which seems to be empty too :)

This is a sample SMTP script with Postfix 2.3.3-1:

220 ent.bazydlo.org ESMTP Postfix (Ubuntu)
helo abc.comp.waw.pl
250 ent.bazydlo.org
MAIL FROM:
501 5.5.4 Syntax: MAIL FROM:<address>
MAIL FROM: <>
250 2.1.0 Ok

Best regards
J.Bazydlo

begin:vcard
fn;quoted-printable:Jaros=C5=82aw Bazyd=C5=82o
n;quoted-printable;quoted-printable:Bazyd=C5=82o;Jaros=C5=82aw
org;quoted-printable:Comp S.A.;Dzia=C5=82 Sieci
adr:;;ul. Jutrzenki 116;Warszawa;macowieckie;02-230;Polska
email;internet:j.bazydlo
title;quoted-printable:Kierownik Projekt=C3=B3w
tel;work:+48225703800
tel;fax:+48226626371
note;quoted-printable:KRS: 0000037706, REGON: 012499190,=0D=0A=
NIP: 522-00-01-694=0D=0A=
Kapita=C5=82 zak=C5=82adowy: 6 900 712,50 z=C5=82
x-mozilla-html:FALSE
url:http://www.comp.waw.pl
version:2.1
end:vcard