Example solution: 501 5.1.3 Bad recipient address syntax in Postfix

To fix 501 5.1.3 Bad recipient address syntax in Postfix,

Put the following in /etc/postfix/main.cf:

strict_rfc821_envelopes = no
#to accept "RCPT TO:<User Name <user@example.com>>". Postfix will ignore the "User Name" part and deliver to the <user@example.com> address.
resolve_numeric_domain = yes 
#to accept "user@ipaddress".

restart postfix:
sudo service postfix restart

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