If vBulletin Options - Email Options - SMTP Email has this explanation:
Quote:
Set this option to yes to use an SMTP server rather than the internal PHP mail() function.
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EI Mod uses the standard vbmail() function which selects one of the following, depending on the configuration in SMTP Email:
- vB_SmtpMail = SMTP wrapper
- vb_Mail = PHP Mail() function
These classes can be found in includes/class_mail.php.