Rails - May 2006 - Action Mailer Errno::EPIPE using different character sets

1. On my Windows development system everything is fine.
2. On my Linux production server I get an Errno::EPIPE (Broken pipe) 
error when sending an email using Action Mailer. The specific situation 
is this:
a) Rails 1.1.2
b) The application is running UTF8, but I want to send my emails as 
ISO-8859-1.
c) Sending UTF-8 emails works fine.
d) Delivery method is SMTP.
e) When using this code
-------------
	def confirm(uuid, user, shop)
		@subject		= "Shop-Anmeldung bei uns"
		@body[''uuid''] = uuid
		@body[''user''] = user
		@body[''shop''] = shop
		@recipients = user.name
		@bcc = ''shop.registration@xxx.de''
		@from = ''info@xxx.de''
		@sent_on = Time.now
		@headers = {}
		@charset    = "iso-8859-1"
	end
-------------
and including German Umlauts (??? etc.) in the template (saved as 
ISO8859-1) I get the above error. As soon as I change my template to not 
include any Umlauts all works fine. It seems that my @charset setting is 
ignored.
3. The top portion of the call stack looks like this:
usr/local/lib/ruby/1.8/net/protocol.rb:266:in `write''
/usr/local/lib/ruby/1.8/net/protocol.rb:266:in `write0''
/usr/local/lib/ruby/1.8/net/protocol.rb:280:in `write_message_0''
/usr/local/lib/ruby/1.8/net/protocol.rb:277:in `each_crlf_line''
/usr/local/lib/ruby/1.8/net/protocol.rb:311:in `adding''
/usr/local/lib/ruby/1.8/net/protocol.rb:335:in `step''
/usr/local/lib/ruby/1.8/net/protocol.rb:335:in `adding''
/usr/local/lib/ruby/1.8/net/protocol.rb:311:in `each_crlf_line''
/usr/local/lib/ruby/1.8/net/protocol.rb:277:in `write_message_0''
/usr/local/lib/ruby/1.8/net/protocol.rb:229:in `write_message''
/usr/local/lib/ruby/1.8/net/protocol.rb:228:in `using_each_crlf_line''
/usr/local/lib/ruby/1.8/net/protocol.rb:290:in `writing''
/usr/local/lib/ruby/1.8/net/protocol.rb:290:in `using_each_crlf_line''
/usr/local/lib/ruby/1.8/net/protocol.rb:228:in `write_message''
/usr/local/lib/ruby/1.8/net/smtp.rb:473:in `sendmail''
/usr/local/lib/ruby/1.8/net/smtp.rb:472:in `send0''
/usr/local/lib/ruby/1.8/net/smtp.rb:548:in `critical''
/usr/local/lib/ruby/1.8/net/smtp.rb:548:in `send0''
/usr/local/lib/ruby/1.8/net/smtp.rb:472:in `sendmail''
/usr/local/lib/ruby/gems/1.8/gems/actionmailer-1.2.1/lib/action_mailer/base.rb:449:in
`perform_delivery_smtp''
/usr/local/lib/ruby/gems/1.8/gems/actionmailer-1.2.1/lib/action_mailer/base.rb:447:in
`start''
/usr/local/lib/ruby/1.8/net/smtp.rb:316:in `start''
/usr/local/lib/ruby/gems/1.8/gems/actionmailer-1.2.1/lib/action_mailer/base.rb:447:in
`perform_delivery_smtp''
/usr/local/lib/ruby/gems/1.8/gems/actionmailer-1.2.1/lib/action_mailer/base.rb:333:in
`send''
/usr/local/lib/ruby/gems/1.8/gems/actionmailer-1.2.1/lib/action_mailer/base.rb:333:in
`deliver!''
/usr/local/lib/ruby/gems/1.8/gems/actionmailer-1.2.1/lib/action_mailer/base.rb:258:in
`deliver''

Is what I am doing totally stupid? Am I missing any config settings. Any 
help would be much appreciated.

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