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Postfix isn't delivering the email to my mail! Does the fact my mailbox has reached 50MB have anything to do with it?

Postfix has a default mailbox size limit of  51200000 (50MB) by default.

To Change the limit from 50MB to 5GB, put into /etc/postfix/main.cf the line:

mailbox_size_limit = 51200000

This may be the cause of the error:

can't create user output file. Command output: procmail: Error while writing to "/var/mail/username"

You can check the value, using:

/usr/sbin/postconf | grep size_limit

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