On 4/6/2011 3:09 AM, Johan Pappu wrote:
How do I Increase my mail sending speed in postfix to all the
destinations?

Do i need to make changes in main.cf <http://main.cf>?

Please suggest me

With default settings on reasonably modern hardware, postfix delivers mail reliably and quickly. Twiddling controls without an understanding of the problem is just as likely to make things worse.

You need to investigate where the bottleneck is before you make changes.

Go to http://www.postfix.org/documentation.html and read the articles under "Problem Solving"

There are also numerous threads in the postfix-users mail list archive about performance you should google for.

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