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How to configure Postfix relayhost (smarthost) to send eMail using an external smptd

How do I configure Postfix MTA to send eMail using an external cloud-based SMTP server (with username: password) from a web server on Linux or Unix-like system? How do I configure an Ubuntu server and postfix as the relay server (smarthost)?
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Linux / UNIX: PHP mail() Error Log File

How do I view PHP mail() errors? How do I see php mail() error log file under UNIX or Linux?
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