Ques/Help Email Bounce: do I have to choose PHP or SMTP?

[Lorthirk]

Hey there, sorry for the silly question, but I can't understand the wording used in the "Bounced email address" option. It says:

Note that this option may not work unless the return path parameter is enabled or mail is sent via SMTP using the Email Transport option.
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I can't understand if:
- it "may not work, unless the return path parameter is enabled or mail is sent via SMTP using the Email Transport option"
OR
- it "may not work unless the return path parameter is enabled, or mail...

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