Intermediate SSL certificates in UW-imapd

We have had UW imapd-2007e running fine for some time.
Recently our SSL certificate provider announced that we had to upgrade our 
1024-bit certificate to 2048 before it was revoked.

The replacement they provided is not signed by a CA in the Mozilla store 
(and hence OpenSSL which copies it) - it uses an intermediate certificate.

I got Apache to work by following instructions and defining 
SSLCertificateChainFile
OpenLdap seems happy with the intermediate certificate added to the bundle 
defined as TLSCACertificateFile.

But imapd does not. It uses a PEM file with both the key and 
certificate, and the OpenSSL library. OpenSSL (at least, the "openssl" 
shell command), uses the bundle in  /etc/pki/tls/cert.pem. But Alpine, at 
least, is unhappy if I just add the intermediate certificate to that.


Is there a solution ? Or should we just order a "proper" directly-signed 
certificate ?

uw-imap-2007e
openssl-0.9.8e-20
CentOS 5.7
Linux 2.6.18 x86_64