Nov 10, 2018

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 <[email protected]>>". Postfix will ignore the "User Name" part and deliver to the <[email protected]> address.
resolve_numeric_domain = yes 
#to accept "[email protected]".

restart postfix:
sudo service postfix restart