Update u_e-postfix-attachment_size.en.md

docs/manual-guides/Postfix/u_e-postfix-attachment_size.en.md

@@ -3,6 +3,8 @@ Open `data/conf/postfix/extra.cf` and set the `message_size_limit` accordingly i
 You will also need to adjust message size in Rspamd and Clamav configurations:
 
 + in `data/conf/rspamd/local.d/options.inc` add `max_message` parameter, check [Rspamd Docs](https://rspamd.com/doc/configuration/options.html#:~:text=DoS%20(default%3A%201024)-,max_message,-maximum%20size%20of) for defaults
++ in `data/conf/rspamd/local.d/external_services.conf` adjust `max_size` parameter for `oletools`
++ in `data/conf/rspamd/local.d/antivirus.conf` adjust `max_size` parameter for `clamav`
 + in `data/conf/clamav/clamd.conf` adjust `MaxScanSize` and `MaxFileSize`