well I have very strange sendmail behaviour some times it sends 200+ emails/sec and some times down to 30 emails/sec, and can't figure it out what's the issue ! using sendmail for mailing list purpose
Ah, this is a very different question from the one you originally asked. 30 mails/sec over the course of a day is incredibly good performance. But seeing that over very short intervals especially when sending out 10k or less emails in not so good.
I have a general idea of what the problem might be, but you may have to Google the details yourself. It's my understanding that sendmail does something similar to this:
http://www.postfix.org/CONNECTION_CACHE_README.html
And something like this as well. http://www.postfix.org/TUNING_README.html#rope
Sorry I'm much more familiar with Postfix and qmail internals than Sendmail or I'd have given you better links. I'd start looking around at how Sendmail does it's queuing and tracking which domains you deliver fastest to and which are slower. Also look at your mail list software's docs because there are usually specific tuning data for each MTA. Mail lists are a bit odd because you're sending the same email X times so you can do things with them that you can't do with other mail. And most of the weird performance hacks are MTA specific.
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