message_size_limit
 

I have the same problem. I have set my /etc/postfix/main.cf "message_size_limit=30960000" and did a postfix reload, and when I do a "postconf -d" it still shows the default value of "message_size_limit=10240000"

Is the default value picked up from some other config file? What should I do to cause the "postconf -d" to show my 30960000?

David

postconf -d shows the defaults, not the values that where currently used by postfix. To get the values that where currently used, use "postconf -n"

Postfix
 

Yes, but my system has just bounced an e-mail with a 24MB attachment. And the maillog said that it can't create user output file to /var/spool/mail/david

I've been writing to that file for years.

The "david" file is 660 and belongs to david:mail and there's plenty of disk space (18GB) available!

Any ideas?

I do not have ispconfig installed on this RH9

What's the exact error message from your mail log?