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> SRS_SECRET = ${readfile{/etc/exim4/srs.conf}}
>   
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> inbound_srs:
>     driver = redirect
>     senders = :
>     domains = +local_domains
>     # detect inbound bounces which are SRS'd, and decode them
>     condition = ${if inbound_srs {$local_part} {SRS_SECRET}}
>     data = $srs_recipient
>   
> inbound_srs_failure:
>     driver = redirect
>     senders = :
>     domains = +local_domains
>     # detect inbound bounces which look SRS'd but are invalid
>     condition = ${if inbound_srs {$local_part} {}}
>     allow_fail
>     data = :fail: Invalid SRS recipient address
>   
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<   condition = ${lookup{$local_part@$domain}lsearch{/etc/exim4/domains/${lookup{$domain}dsearch{/etc/exim4/domains/}}/aliases}{false}{true}}
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> remote_forwarded_smtp:
>   driver = smtp
>   helo_data = ${lookup dnsdb{>: defer_never,ptr=$sending_ip_address}{${listextract{1}{$value}}}{$primary_hostname}}
>   dkim_domain = DKIM_DOMAIN
>   dkim_selector = mail
>   dkim_private_key = DKIM_PRIVATE_KEY
>   dkim_canon = relaxed
>   dkim_strict = 0
>   hosts_try_fastopen = !*.l.google.com
>   interface = ${if exists{OUTGOING_IP}{${readfile{OUTGOING_IP}}}}
>   # modify the envelope from, for mails that we forward
>   max_rcpt = 1
>   return_path = ${srs_encode {SRS_SECRET} {$return_path} {$original_domain}}
>