Troubleshooting PostFix Message Size Too Big

I finally got around to reading my PostFix logs, and I found a few big errors. One of them was fatal: address(##): message file too big

The problem is probably in these two settings in the PostFix main config: message_size_limit and mailbox_size_limit

Check the configuration using:

postconf | grep size
postconf -d | grep size

where the -d is to check the default size.

Fix the error by editing the file using:

Method 1:
sudo postconf -e mailbox_size_limit=0
sudo postconf -e message_size_limit=0
Method 2:
sudo nano /etc/postfix/

Either add these lines or edit existing ones

message_size_limit = 0
mailbox_size_limit = 0
service postfix restart

Sources: 1, 2