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/* This is a sample filter for Mailfromd. -*- mfl -*-
Site administrators are urged to write nicer versions.
Copyright (C) 2005-2025 Sergey Poznyakoff
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#pragma regex +extended +icase
require status
require dns
require localdomain
require rateok
require poll
require callout
# Set email address used in callout MAIL command. Default is <>.
#set mailfrom_address "<>"
# If mailfromd does not determine your local domain correctly, uncomment this,
# replace DOMAIN with your local domain, and comment out the assignment to
# this variable in the 'begin' block below.
#set ehlo_domain "DOMAIN"
number gltime interval("1 hour")
number need_greylist 0
const whitelist_db "/etc/mail/whitelist.db"
func cachestr()
returns string
do
if cache_used
return "[CACHED] "
else
return ""
fi
done
prog envfrom
do
if $f == ""
pass
elif relayed(hostname($client_addr))
pass
elif access(whitelist_db, R_OK) and dbmap(whitelist_db, $client_addr)
accept
elif hostname($client_addr) matches ".*(adsl|sdsl|hdsl|ldsl|dialin|dialup|ppp|dhcp|dynamic).*"
reject 550 5.7.1 "Use your SMTP relay"
elif hostname($client_addr) matches ".*-[0-9]{1,3}-[0-9]{1,3}-[0-9]{1,3}-[0-9]{1,3}.*"
set need_greylist 1
elif $f mx fnmatches "*.yahoo.com"
or $f mx fnmatches "*.namaeserver.com"
set need_greylist 1
else
on poll $f do
when success:
pass
when not_found or failure:
reject 550 5.1.0 cachestr() . "Sender validity not confirmed"
when temp_failure:
tempfail
done
fi
if not rateok("$f-$client_addr", interval("1 hour 30 minutes"), 100)
tempfail 450 4.7.0 "Mail sending rate exceeded. Try again later"
fi
done
prog envrcpt
do
if need_greylist
if greylist("${client_addr}-$f-${rcpt_addr}", gltime)
if greylist_seconds_left == gltime
tempfail 450 4.7.0
"You are greylisted for %gltime seconds"
else
tempfail 450 4.7.0
"Still greylisted for %greylist_seconds_left seconds"
fi
fi
fi
done
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