`accept-broken-mime`: `<boolean>` ('default =' `0`)::

Accept e-mails with broken MIME structure (insecure). If enabled, a `X-Proxmox-Broken-Message` header is added to each mail with broken MIME structure.

`banner`: `<string>` ('default =' `ESMTP Proxmox`)::

ESMTP banner.

`before_queue_filtering`: `<boolean>` ('default =' `0`)::

Enable before queue filtering by pmg-smtp-filter

`conn_count_limit`: `<integer> (0 - N)` ('default =' `50`)::

How many simultaneous connections any client is allowed to make to this service. To disable this feature, specify a limit of 0.

`conn_rate_limit`: `<integer> (0 - N)` ('default =' `0`)::

The maximal number of connection attempts any client is allowed to make to this service per minute. To disable this feature, specify a limit of 0.

`dnsbl_sites`: `<string>` ::

Optional list of DNS welcome/blocklist 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 (postfix option `postscreen_dnsbl_threshold`).

`dwarning`: `<integer> (0 - N)` ('default =' `4`)::

SMTP delay warning time (in hours). (postfix option `delay_warning_time`)

`filter-timeout`: `<integer> (2 - 86400)` ('default =' `600`)::

Timeout for the processing of one mail (in seconds)  (postfix option `smtpd_proxy_timeout` and `lmtp_data_done_timeout`)

`greylist`: `<boolean>` ('default =' `1`)::

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. (postfix option `smtpd_helo_restrictions`)

`hide_received`: `<boolean>` ('default =' `0`)::

Hide received header in outgoing mails.

`log-headers`: `<boolean>` ('default =' `0`)::

Log the envelope sender and recipient together with the decoded From, To, and Subject headers of each processed mail to the mail log. This eases auditing and tracing, but writes potentially personal data, such as mail subjects and addresses, to the host log. Make sure this is compatible with your data-protection obligations before enabling it.

`maxsize`: `<integer> (1024 - N)` ('default =' `10485760`)::

Maximum email size. Larger mails are rejected. (postfix option `message_size_limit`)

`message_rate_limit`: `<integer> (0 - N)` ('default =' `0`)::

The maximal number of message delivery requests that any client is allowed to make to this service per minute.To disable this feature, specify a limit of 0.

`ndr_on_block`: `<boolean>` ('default =' `0`)::

Send out NDR when mail gets blocked

`queue-lifetime`: `<integer> (1 - 100)` ::

Maximum time (in days) a deferred message is kept in the queue before it is returned to the sender as undeliverable. Also applies to bounce (notification) messages. (postfix options `maximal_queue_lifetime` and `bounce_queue_lifetime`)

`rejectunknown`: `<boolean>` ('default =' `0`)::

Reject unknown clients. (postfix option `reject_unknown_client_hostname`)

`rejectunknownsender`: `<boolean>` ('default =' `0`)::

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`)::

Use Sender Policy Framework.

`verifyreceivers`: `<450 | 550>` ::

Enable receiver verification. The value specifies 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`)

