+static uschar * corked = NULL;
+static int c_size = 0, c_len = 0;
+
+DEBUG(D_tls) debug_printf("%s(%p, %d%s)\n", __FUNCTION__,
+ buff, len, more ? ", more" : "");
+
+/* Lacking a CORK or MSG_MORE facility (such as GnuTLS has) we copy data when
+"more" is notified. This hack is only ok if small amounts are involved AND only
+one stream does it, in one context (i.e. no store reset). Currently it is used
+for the responses to the received SMTP MAIL , RCPT, DATA sequence, only. */
+
+if (is_server && (more || corked))
+ {
+ corked = string_catn(corked, &c_size, &c_len, buff, len);
+ if (more)
+ return len;
+ buff = CUS corked;
+ len = c_len;
+ corked = NULL; c_size = c_len = 0;
+ }