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… using a custom Postfix main.cf
config file
/var/packages/MailServer/etc/customize/postfix/main.cf
recipient_delimiter=“+”
to the file/usr/syno/bin/synopkg stop MailServer /usr/syno/bin/synopkg stop MailStation
/usr/syno/bin/synopkg start MailServer /usr/syno/bin/synopkg start MailStation
name+YOUR_SPECIAL_VALUE@your-domain.com