I'm way behind the times. http://www.faqs.org/rfc/rfc3749.txt
Looking at OpenSSL code, I think the patch below will give 0.9.8 ability to support deflate compression. I'm not sure if I should include that to Dovecot though. At least not for v1.1. :)
diff -r 68a0be847980 src/login-common/ssl-proxy-openssl.c --- a/src/login-common/ssl-proxy-openssl.c Fri Jun 20 12:20:17 2008 +0300 +++ b/src/login-common/ssl-proxy-openssl.c Sat Jun 21 04:29:51 2008 +0300 @@ -719,6 +719,7 @@ ssl_clean_free); SSL_library_init(); SSL_load_error_strings(); + (void)SSL_COMP_get_compression_methods();
extdata_index = SSL_get_ex_new_index(0, dovecot, NULL, NULL, NULL);
Huh? As far as I can tell that will just return NULL and have no side effects because you haven't previously added compression methods with SSL_COMP_add_compression_method. johannes