[Mimedefang] Reject :451 4.7.1 Please try again later

[Mike Smith]

 Hi All,

 I'm in the process of cutting over from spamass-milter to mimedefang and for the
most part things are tons better. The machines are more responsive and the load
isn't nearly as high.

last pid:   860;  load averages:  1.15,  1.30,  1.38  <- Mimedefang 2.29
last pid: 20837;  load averages:  0.98,  1.34,  1.38  <- Mimedefang 2.29
last pid:  5850;  load averages:  9.37,  8.57,  8.15  <- Spamass-Milter

 Although, I'm seeing a few of these errors every now and again.

Feb  6 07:26:14 local at scl8mr02 sendmail[24530]: [ID 801593 mail.info]
h16FPcgm024530: Milter: data, reject=451 4.7.1 Please try again later
Feb  6 07:26:14 local at scl8mr02 sendmail[24560]: [ID 801593 mail.info]
h16FPlgm024560: Milter: data, reject=451 4.7.1 Please try again later
Feb  6 07:26:15 local at scl8mr02 sendmail[24585]: [ID 801593 mail.info]
h16FQ8gm024585: Milter: data, reject=451 4.7.1 Please try again later
Feb  6 07:26:15 local at scl8mr02 sendmail[24586]: [ID 801593 mail.info]
h16FQ4gm024586: Milter: data, reject=451 4.7.1 Please try again later
Feb  6 07:26:15 local at scl8mr02 sendmail[24572]: [ID 801593 mail.info]
h16FPsgm024572: Milter: data, reject=451 4.7.1 Please try again later

 Looking at the entries, they seem to happen more often when a bunch of mails hit
the server at once.

 My question is why are they being rejected? I would think that the with the
following line in sendmail.cf that mail would go through unchecked if there are any
troubles with the milter (ie : F=, )

Xmimedefang, S=unix:/var/spool/MIMEDefang/mimedefang.sock, F=, T=S:60s;R:60s;E:5m

 From what I can tell, this error is coming from mimedefang and not sendmail.

 Any help would be good.

 Thanks,

 -Mike