Is there a size limitation for id in postfix smtp-client/sasl?

I am trying to set up sender_dependent_relayhost_maps for
different users on a machine at home. It works fine for one
user (a) but fails for the other (b).

Nov 20 00:07:03 hub postfix/pickup[25952]: 4E9686FB47: uid=1003 from=<b>
Nov 20 00:07:03 hub postfix/cleanup[25961]: 4E9686FB47:
message-id=<[EMAIL PROTECTED]>
Nov 20 00:07:03 hub postfix/qmgr[25704]: 4E9686FB47: from=<[EMAIL PROTECTED]>,
size=417, nrcpt=1 (queue active)
Nov 20 00:07:03 hub postfix/smtp[25963]: 4E9686FB47:
to=<[EMAIL PROTECTED]>, relay=mail.gmx.net[213.165.64.20]:25, delay=0.36,
delays=0.14/0.03/0.1/0.1, dsn=5.7.0, status=bounce
d (host mail.gmx.net[213.165.64.20] said: 550 5.7.0 Need to authenticate
via SMTP-AUTH-Login {mp037} (in reply to MAIL FROM command))

The account data of b is correct because a mua (evolution) was able
to authenticate.

I am using debian etch on a tiny Linksys NSLU2 and so I would like
to stick with the normal packages and not build newer versions.

Postfix version is 2.3.8
SASL version is 2.1.22

The only difference between a and b is that [EMAIL PROTECTED]
is longer than [EMAIL PROTECTED]

Could it be that there is a size limit for user ids in the Postfix
smtp client or in libsasl2 ?

The relevant part of the main.cf :
------
myhostname = hub.zuhause
myorigin = /etc/mailname
relayhost = smtp.my-provider.de
smtp_generic_maps = hash:/etc/postfix/generic
sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relayhosts
smtp_sender_dependent_authentication = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
-----

generic :
-----
[EMAIL PROTECTED]       [EMAIL PROTECTED]
[EMAIL PROTECTED]   [EMAIL PROTECTED]
[EMAIL PROTECTED]       [EMAIL PROTECTED]
[EMAIL PROTECTED]   [EMAIL PROTECTED]
-----


sender_relayhosts :
-----
[EMAIL PROTECTED]               [mail.gmx.net]
[EMAIL PROTECTED]   [mail.gmx.net]
[EMAIL PROTECTED]               [mail.gmx.net]
[EMAIL PROTECTED] [mail.gmx.net]
-----

sasl_passwd :
-----
[EMAIL PROTECTED]   [EMAIL PROTECTED]:password
[EMAIL PROTECTED] [EMAIL PROTECTED]:passwrod
-----


cu, Stefan


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