I saw a thread in the archive asking why mail to Hotmail and MSN is
being rejected. It was contributed to anti-spam and other things.
MSN and Hotmail have a limit on the number of Recipients in the To: or
CC: header entries and the have a connection limit per mail server.
If the To: or CC: header entries exceed 25 or the number of concurrent
connects from a single host exceed 10 they message will be rejected.
I got around this by decrease the TOBUFSIZE in conf.h and recompiled
sendmail. The current versions of sendmail have this set to 4096 which will
allow up to 45 entries in the To: or CC: Fields.
I lowered the number to 1024 and MSN was happy. Sendmail's performance
doesn't seem to be affected too much.
For those that read the O'Reilly TOBUFSIZE is to limit the number of To:
entries going to the syslog daemon; however if you read on it also says that
it affects the number of entries in the To: field in the outgoing message as
I hope this helps!!
Peter P. Benac, CCNA
Emacolet Networking Services, Inc
Providing Systems and Network Consulting, Web Hosting Services
Phone: 919-847-1740 or 866-701-2345
To have principles...
First have courage.. With principles comes integrity!!!