Data Format Error

AJ aj at
Fri Mar 25 12:08:03 EST 2005

Are you guys using this?

I think this will do what you want.


Christopher Fisk wrote:
> On Fri, 25 Mar 2005, Andrew Brink wrote:
>> Hi All -
>> I am getting a bunch of these "Data Format Errors" in my sendmail log 
>> files.  These are happening mostly when spam gets sent to a user that 
>> does not actually have a mailbox.  Below is an example of one message:
>> sendmail[1007]: j2PFXQgM001005: to=<aa36987 at>, 
>> delay=00:00:00, xdelay=00:00:00, mailer=cyrus, pri=512884, dsn=5.6.0, 
>> stat=Data format error
>> Any ideas of why I get this instead of just a stat=User Unknown?
> I've run into the same issue, and as I'm running my messages through 
> MailScanner I've not been able to figure out a solution to get sendmail 
> to check for valid users on the cyrus server until after it's accepted 
> the message.  As a workaround, (I have a relatively few number of 
> addresses that are valid on this server) I have begun using
> FEATURE(blacklist_recipients)dnl
> in my file, then, in my /etc/mail/access I do the following 
> for each valid user:
> To:user1 at yourdomain.tld        RELAY
> To:user2 at yourdomain.tld        RELAY
> To:.yourdomain.tld        550 ERROR: NO SUCH USER
> To:yourdomain.tld        550 ERROR: NO SUCH USER
> Hope that helps, and perhaps someone else will have an answer on getting 
> sendmail to check cyrus during the initial connection.
> Christopher Fisk
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