最後更新: 2022-07-22

Settings

Postfix

main.cf

# Handle Postfix-style extensions.
recipient_delimiter = +

# Handle both Postfix and qmail extensions (Postfix 2.11 and later).
recipient_delimiter = +-

postconf recipient_delimiter   # Default: empty

Amavisd

@addr_extension_spam_maps = ('spam');

$sa_tag2_level_deflt = 6.7 ;        # score above which spam extension is added
$sa_kill_level_deflt = 15;          # block higher score entirely
$final_spam_destiny=D_DISCARD;      # junk all above kill level

$replace_existing_extension = 1;    # true: replace extension;  false: append extension

Tells Amavisd-new to rewrite the recipient address of spam messages

from [email protected] to user+spam@domain

Other map

# This extension may be used by the final local delivery agent (LDA) to place such mail into different subfolders

# @addr_extension_virus_maps  = ('virus');     # defaults to empty
# @addr_extension_spam_maps   = ('spam');      # defaults to empty
# @addr_extension_banned_maps = ('banned');    # defaults to empty
# @addr_extension_bad_header_maps = ('badh');  # defaults to empty

# LDAs usually default to stripping away address extension if no special
# handling is specified or if a named subfolder or alias does not exist,
# so adding address extensions normally does no harm.

@addr_extension_spam_maps = (
  { '.sub1.example.com' => 'spam',     # an entire subdomain
    '[email protected]' => 'spam',     # a particular user
    '[email protected]' => 'malware',  # another user wants a different ext.
    '.'                 => '' }  # all the rest do not receive an extension
);