Short Description: Change the behavior from the SMTP MTA.
Setting the NOTES.INI variable called prevents SMTPMTA from incorrectly processing mail to users whose name includes the Notes domain to the left of the @ and contains a period domain separator. Also Mail sent to firstname.lastname@example.org will not be a valid adressing. Spammers often use this to get though to your end users. With this setting you even more tighten your incoming internet e-mails to their real internet address.