At the end of the WordPress installation process, it sends an e-mail message containing the password to the new administrator.
However, WordPress sends this message from “wordpress@<domain name>”. That address may not exist (in fact, it probably doesn’t), which can cause problems: in particular, anti-spam systems that check the validity of the sender address will fail (I’ve actually seen this happen).
WordPress should not use a fake, probably nonexistent sender address like this. When PHP is using sendmail (which most are), it’s better to not specify the sender address at all; most hosting environments are (or should be) configured with a reasonable working default.
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