Hello.
If like me, you’ve set up FBX e-mail services (postfix, dovecot, rspamd), it might help to know that you can adjust your e-mail message size.
By default the default message size is 10 MB. Normally this is good but, once in a while you may need more. Here’s the command to adjust this limit to 50 MB.
sudo postconf -e message_size_limit=52428800
sudo systemctl restart postfix
You can change the limit to your requirements (in bytes) with message_size_limit. If you define 0 it will be limitless. While you’re at it, it may also interest you to see other postfix settings in /etc/postfix/main.cf
Cheers.
Ged.