[exim] Questions about "Line too long"

Hello,

i run exim 4.50-8sarge2 on a debian/sarge server.

some mails to t-online.de addresses are rejected with the following
message:

** somebody@??? <somebody@???> R=dnslookup
        T=remote_smtp: SMTP error from remote mailer after end
        of data: host mailin06.sul.t-online.de [194.25.134.11]:
        500 5.6.1 Line too long.

i found only one useful link about this error:
http://www.exim.org/pipermail/exim-users/Week-of-Mon-20010625/027361.html

is it the case here, that mailin06.sul.t-online.de rejects the mail
because it contains lines that exceed a specified limit?

if this is true, does exim support to automatically break long lines
before transmitting the message to mailin06.sul.t-online.de?

...
jonas