To solve the Postfix 552 5.3.4 Message size exceeds fixed limit error, we will write the following code in the postfix main.cf folder and restart the service.
552 5.3.4 Message size exceeds fixed limit
About 50MB
message_size_limit = 52428800
NOTE: If you set the limit to 0, it will be unlimited. Be careful.
After setting the limit, we restart the service with the following command and the process is completed.
systemctl restart postfix
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