`dnsbl_sites`: `<string>` ::
-Optional list of DNS white/blacklist domains (see postscreen_dnsbl_sites parameter).
+Optional list of DNS white/blacklist domains (postfix option `postscreen_dnsbl_sites`).
`dnsbl_threshold`: `<integer> (0 - N)` ('default =' `1`)::
-The inclusive lower bound for blocking a remote SMTP client, based on its combined DNSBL score (see postscreen_dnsbl_threshold parameter).
+The inclusive lower bound for blocking a remote SMTP client, based on its combined DNSBL score (postfix option `postscreen_dnsbl_threshold`).
`dwarning`: `<integer> (0 - N)` ('default =' `4`)::
-SMTP delay warning time (in hours).
+SMTP delay warning time (in hours). (postfix option `delay_warning_time`)
`greylist`: `<boolean>` ('default =' `1`)::
-Use Greylisting.
+Use Greylisting for IPv4.
+
+`greylist6`: `<boolean>` ('default =' `0`)::
+
+Use Greylisting for IPv6.
+
+`greylistmask4`: `<integer> (0 - 32)` ('default =' `24`)::
+
+Netmask to apply for greylisting IPv4 hosts
+
+`greylistmask6`: `<integer> (0 - 128)` ('default =' `64`)::
+
+Netmask to apply for greylisting IPv6 hosts
`helotests`: `<boolean>` ('default =' `0`)::
-Use SMTP HELO tests.
+Use SMTP HELO tests. (postfix option `smtpd_helo_restrictions`)
`hide_received`: `<boolean>` ('default =' `0`)::
`maxsize`: `<integer> (1024 - N)` ('default =' `10485760`)::
-Maximum email size. Larger mails are rejected.
+Maximum email size. Larger mails are rejected. (postfix option `message_size_limit`)
`message_rate_limit`: `<integer> (0 - N)` ('default =' `0`)::
`rejectunknown`: `<boolean>` ('default =' `0`)::
-Reject unknown clients.
+Reject unknown clients. (postfix option `reject_unknown_client_hostname`)
`rejectunknownsender`: `<boolean>` ('default =' `0`)::
-Reject unknown senders.
+Reject unknown senders. (postfix option `reject_unknown_sender_domain`)
+
+`smtputf8`: `<boolean>` ('default =' `1`)::
+
+Enable SMTPUTF8 support in Postfix and detection for locally generated mail (postfix option `smtputf8_enable`)
`spf`: `<boolean>` ('default =' `1`)::
`verifyreceivers`: `<450 | 550>` ::
-Enable receiver verification. The value spefifies the numerical reply code when the Postfix SMTP server rejects a recipient address.
+Enable receiver verification. The value spefifies the numerical reply code when the Postfix SMTP server rejects a recipient address. (postfix options `reject_unknown_recipient_domain`, `reject_unverified_recipient`, and `unverified_recipient_reject_code`)