Added a question about synchronous DNS resolution on deliveries from

localhost.

1 files changed, 12 insertions, 0 deletions

diff --git a/FAQ b/FAQ
index 446c25cc3..4c10e9992 100644
--- a/FAQ
+++ b/FAQ
@@ -10,6 +10,18 @@ A. You spell it "Mailman", with a leading capital "M" and a lowercase
    second "m".  It is incorrect to spell it "MailMan" (i.e. you should
    not use StudlyCaps).
 
+Q. I'm getting really terrible performance for outgoing messages.  It
+   seems that if the MTA has trouble resolving DNS for any recipients,
+   qrunner just gets really slow clearing the queue.  Any ideas?
+
+A. What's likely happening is that your MTA is doing DNS resolution
+   for messages delivered locally (i.e. from Mailman to your MTA via
+   SMTPDirect.py).  This is a Bad Thing.  You need to turn off
+   synchronous DNS resolution for messages originating from the local
+   host.  See the README.YOURMTA file to see if there's specific
+   instructions on how to fix this for your MTA, or check your MTA's
+   documentation.
+
 Q. What if I get "document contains no data" from the web server, or
    mail isn't getting delivered, or I see "Premature end of script
    headers" or "Mailman CGI error!!!"