diff -ur qpopper4.0.5/popper/pop_tls_openssl.c qpopper4.0.5-patch/popper/pop_tls_openssl.c
--- qpopper4.0.5/popper/pop_tls_openssl.c	2006-01-27 00:03:30.000000000 +0100
+++ qpopper4.0.5-patch/popper/pop_tls_openssl.c	2006-01-27 00:02:33.000000000 +0100
@@ -361,9 +361,8 @@
      */
     DEBUG_LOG1 ( pPOP, "...setting certificate file %s",
                  pPOP->tls_server_cert_file );
-    nErr = SSL_CTX_use_certificate_file ( pTLS->m_OpenSSLctx,
-                                          pPOP->tls_server_cert_file,
-                                          SSL_FILETYPE_PEM );
+    nErr = SSL_CTX_use_certificate_chain_file ( pTLS->m_OpenSSLctx,
+                                          pPOP->tls_server_cert_file );
     if ( nErr <= 0 ) {
         log_openssl_err ( pPOP, HERE, "Error setting certificate PEM file %s",
                           pPOP->tls_server_cert_file );