sendmail in redhat 7.0 dies every half hour or so after it is has been started. no hint in any log files why it dies so often. i downgraded to sendmail included in redhat 6.2 and now the old version is stable again
I have experienced similar spontaneous dies of sendmail, but haven't seen an error message yet.
I too have seen similar problems with no error messages to indicate the cause.
Are any of you who are experiencing sendmail instability running glibc-2.1.94-3? It's a fresh update on updates.redhat.com which solves some backward binary compatibility and DNS resolver issues. Don't have sendmail daemon running on my test 7.0 system but the glibc update sounds like it might be relevant.
Now that i have switched to the new glibc packages sendmail seems stable so far. 5 hours without a crash.
I have that glibc installed of course since it has been available at nearby mirrors. Whether it fixes the sendmail problem, time will tell, don't you think? ;-) If I knew what circumstances caused those sendmail problems, I'd try to reproduce it with the new glibc. I think it might have been related to timeouts, i.e. when sendmail hasn't been used for some time and the machine has been offline. I haven't encountered any of those mysterious lock-ups recently. The reason might be the updated glibc...