I'm investigating a similar problem at our site. We're using
Postfix 2.0.1 and the remote site is using Exchange2000.
The problem only occurs when an attachment is enclosed.
Messages without attachments come through without problems.

        Frank

> -----Original Message-----
> From: Kai Wang [mailto:kwangucalgary.ca]
> Sent: Thursday, February 20, 2003 12:43 PM
> To: postfix-userspostfix.org
> Subject: 421 Error: timeout exceeded
>
>
>
>
> Hello,
>
> We just upgraded to postfix 2.0.3. Recently we often receive
> I/O errors
> on the other email servers which talk to postfix server. The
> errors are
> generated by postfix while receiving the data part of the messages.
> I don't think it is necessary to check the other recipients, which the
> message is not supposed to be delivered to. Is there a way to disable
> such checking in postfix?
>
> For example, we have a sendmail server, mhub2, which sends all the
> messages to a postfix server, mr1.
>
> --------------------------------------------------------------
> ------------------------------
>
> [rootmhub2 root]# time /usr/sbin/sendmail -v -qIh1GI4uw13393
>
> Running /var/spool/mqueue/h1GI4uw13393 (sequence 1 of 1)
> <USER1ucalgary.ca>... Connecting to mr1.ucalgary.ca. via relay...
> 220 mr1.ucalgary.ca ESMTP Postfix
> >>> EHLO mhub2.ucalgary.ca
> 250-mr1.ucalgary.ca
> 250-PIPELINING
> 250-SIZE 61440000
> 250-ETRN
> 250-XVERP
> 250 8BITMIME
> >>> MAIL From:<USER2shaw.ca> SIZE=842207
> 250 Ok
> >>> RCPT To:<USER1ucalgary.ca>
> 250 Ok
> >>> DATA
> 354 End data with <CR><LF>.<CR><LF>
> aonet.com: Name server timeout
> I/O error
> Closing connection to mr1.ucalgary.ca.
>
> real 2m48.467s
> user 0m0.040s
> sys 0m0.000s
>
> [rootmhub2 root]# grep aonet.com /var/spool/mqueue/qfh1GI4uw13393
> H??Cc: USER3 <USER3aonet.com>,
> --------------------------------------------------------------
> ------------------------------
>
> 09:52:28.484886 mr1.ucalgary.ca.smtp > mhub2.ucalgary.ca.42629: P
> 180:209(29) ack 104 win 5792 <nop,nop,timestamp 328899973
> 7439264> (DF)
> 0x0000 4500 0051 7498 4000 4006 6f88 889f 22a5
> E..Qt...o...".
>
> 0x0010 889f 22a3 0019 a685 96ad 16c9 9737 7296
> .."..........7r.
>
> 0x0020 8018 16a0 b188 0000 0101 080a 139a 9d85
> ................
>
> 0x0030 0071 83a0 3432 3120 4572 726f 723a 2074
> .q..421.Error:.t
>
> 0x0040 696d 656f 7574 2065 7863 6565 6465 640d
> imeout.exceeded.
>
> 0x0050 0a .
> --------------------------------------------------------------
> ------------------------------
>
> Thanks
> Kai Wang
>

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