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Parameters that control proxying:
-
smtpd_proxy_filter (syntax: host:port): The host and TCP
port of the before-queue content filter. When no host or host:
is specified here, localhost is assumed.
-
smtpd_proxy_timeout (default: 100s): Timeout for connecting
to the before-queue content filter and for sending and receiving
commands and data. All proxy errors are logged to the maillog
file. For privacy reasons, all the remote SMTP client sees is "451
Error: queue file write error". It would not be right to disclose
internal details to strangers.
-
smtpd_proxy_ehlo (default: $
myhostname): The hostname to
use when sending an EHLO command to the before-queue content filter.
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