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

April 26, 2017accounts client email ISP postfix relaying smarthost SMTP support

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

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[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.