vestacp-docker/vesta/etc/exim4/conf.d/transport/10_exim4-config_transport-macros

### transport/10_exim4-config_transport-macros
#################################

.ifdef HIDE_MAILNAME
REMOTE_SMTP_HEADERS_REWRITE=*@+local_domains $1@DCreadhost frs : *@ETC_MAILNAME $1@DCreadhost frs
REMOTE_SMTP_RETURN_PATH=${if match_domain{$sender_address_domain}{+local_domains}{${sender_address_local_part}@DCreadhost}{${if match_domain{$sender_address_domain}{ETC_MAILNAME}{${sender_address_local_part}@DCreadhost}fail}}}
.endif

.ifdef REMOTE_SMTP_HELO_FROM_DNS
.ifdef REMOTE_SMTP_HELO_DATA
REMOTE_SMTP_HELO_DATA==${lookup dnsdb {ptr=$sending_ip_address}{$value}{$primary_hostname}}
.else
REMOTE_SMTP_HELO_DATA=${lookup dnsdb {ptr=$sending_ip_address}{$value}{$primary_hostname}}
.endif
.endif