Re(2): [Exim] Exim delivery problem

ph10@??? writes:
>On Thu, 7 Dec 2000, Alexander G. Jerjomin wrote:
>
>> I can't send mail only to few hosts. Logfile shows me
>>
>> T=remote_smtp defer (110): Connection timed out:
>> SMTP timeout while connected to mail.xxxxxxx.ee [x.y.z.v]
>> after end of data (7188 bytes written)
>>
>> But I can send mail if size of mail less than ~1024 bytes.
>>
>> I have installed 'Smail-3.2.0.109' on another PC and I can send
>> my problem mail from this host to mail.xxxxxxx.ee.
>
>Are the two hosts on the same LAN? If not, this sounds like some kind of
>networking issue. There's something in the FAQ about problems with large
>messages which cause this problem over some network connections.
>
>If the two hosts are on the same LAN, this seems very odd.
>
The problem might be the MTU size assigned to the interfaces (and the
router!!) And yes, it is also possible to experience that problem on the
same LAN. The default MTU is 1500 on most implementations. some router
might drop packages with too much payload. So your exim might send all the
packages, but they never reach the target. Use tcpdumpt to check traffic
between your exim machine and your smail machine. use IFCONFIG to check
and adjust the MTU size of your interfaces. Try to set MTU size on your
exim PC to 1000 (ifconfig eth0 1000, if eth0 is your network interface),
just to check whether it's working or not. BEWARE: somtimes the MTU
adjustment crashes a machine, so be sure to end all important applications
before ;)

Armin