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mail server

How do I support multiple ISP accounts (smarthost) in the Postfix SMTP client for relaying email? For example:

[a] user1@isp1.com must be relay via smtp.isp1.com.
[b] user1@isp2.com must be relay via smtp.isp2.com.
[c] me@mycorp.com must relay all my default email via smtp.mycorp.com.
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My ISP requires that mail from my dynamic IP to our small business email addresses uses their outgoing SMTP servers. This is probably done to reduce abuse and spam but now I'm not able to send email and local Postfix log file displays authentication failure message. How do I relay mail through my mail ISP servers using Postfix SMTP under Linux / UNIX like operating systems?
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FreeBSD Install FuzzyOCR To Detect Image Spam

How do I install FuzzyOcr plugin for SpamAssassin to detect unsolicited bulk mail (Spam) containing images as the main content for Postfix mail server?
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cPanel: Update Exim Mail Server

Q. I'm using Cpanel CentOS Linux server. How do I upgrade my exim mail server? How do I update to the latest version of exim under cPanel Sever?
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Exim Remove All messages From the Mail Queue

Question: I'm using Exim mail server under CentOS Linux. How do I remove all messages from the Exim mail queue using a shell prompt?
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PHP Send Email

Q. How do I send an email using PHP and Apache webserver under Linux / UNIX operating systems? How do I send email from a PHP Script?
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DNS Name Resolution

Q. Can you explain DNS name resolution concept? Why I need to set DNS resolution for my Windows or Linux server? How do I setup DNS name resolution under Linux / UNIX server system?
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