[otrs] otrs 2.4.5 - Compose Answer (email) - Premature end of script headers

[Piotrek]

Hi,

I just installed OTRS version 2.4.5 (using rpm @ otrs.org).
Everything is working well except one thing.

In order to compose an answer (empty email) and submitting it nothing 
happened for approx. 2 minutes.

Then I got "Internal Server Error" (CentOS 4.x) or "Proxy error" (CentOS 
5.4) and email has been sent to the recipient.

There are some entries in logs:

/etc/httpd/logs/error_log:
[Sun Jan 03 22:20:15 2010] [error] [client 10.10.1.240] Premature end of 
script headers: index.pl, referer: 
http://10.10.1.73/otrs/index.pl?Action=AgentTicketCompose&ResponseID=1&TicketID=76&ArticleID=269

/tmp/otrs.log
[Sun Jan  3 22:20:17 
2010][Notice][Kernel::System::Ticket::Article::ArticleSend] Sent email 
to '"****" <****>' from '****'. HistoryType => SendAnswer, Subject => 
Re: [Ticket#2010010110000066] t14;

I'm running:
CentOS v. 4.x(kernel 2.6.18-164.2.1.el5.028stab066.10 - OpneVZ VPS)
OTRS v2.4.5
apache 2.0.52
mysql 4.1.22
perl v5.8.8
perl modules:
    o CGI............................ok (v3.48)
    o Date::Pcalc....................ok (v1.2)
    o Date::Format...................ok (v2.24)
    o DBI............................ok (v1.40)
    o DBD::mysql.....................ok (v2.9004)
    o Digest::MD5....................ok (v2.36)
    o Crypt::PasswdMD5...............ok (v1.3)
    o LWP::UserAgent.................ok (v2.031)
    o Encode::HanExtra...............ok (v0.23)
    o IO::Scalar.....................ok (v2.110)
    o IO::Wrap.......................ok (v2.110)
    o MIME::Base64...................ok (v3.07)
    o Mail::Internet.................ok (v2.04)
    o MIME::Tools....................ok (v5.427)
    o Net::DNS.......................ok (v0.66)
    o Net::POP3......................ok (v2.28)
    o Mail::POP3Client...............ok (v2.18 )
       o IO::Socket::SSL.............ok (v1.31)
    o Net::IMAP::Simple..............ok (v1.17)
       o Net::IMAP::Simple::SSL......ok (v1.3)
    o Net::SMTP......................ok (v2.29)
       o Authen::SASL................ok (v2.12)
       o Net::SMTP::SSL..............ok (v1.01)
    o Net::LDAP......................ok (v0.31)
    o GD.............................Not installed!
       o GD::Text....................Not installed!
       o GD::Graph...................Not installed!
       o GD::Graph::lines............Not installed!
       o GD::Text::Align.............Not installed!
    o PDF::API2......................ok (v0.73)
       o Compress::Zlib..............ok (v2.023)
    o SOAP::Lite.....................ok (v0.710.10)
    o XML::Parser....................ok (v2.34)

I got the same behavior running CentOS 5.4

May I ask for some suggestion / help please.

-- 

Best Regards

Peter