Author Topic: roundcube SMTP error (450) Recipient address rejected: Access denied  (Read 989 times)

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 Log in to roundcube and use my domain name mailbox to send mail, the following error message appears:
SMTP error (450) Recipient address rejected: Access denied


I don't know what went wrong? I speculate that it may be a problem with roundcube's MX records.

I use an external DNS (non-CWP DNS). How do I set up roundcube's MX record?
Chen Wei Liang Blog:
https://www.chenweiliang.com/

CWP (CENTOS WEB PANEL) control panel configuration method:
https://www.chenweiliang.com/cwp-kong-zhi-mian-ban/

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Maybe your localhost/server is not allowed to send email.

Check:
/etc/postfix/main.cf
and add permit_mynetworks to smtpd_recipient_restrictions example:

smtpd_recipient_restrictions =
    permit_sasl_authenticated,
    permit_mynetworks,
    reject_unauth_destination,
    reject_non_fqdn_sender,
    reject_non_fqdn_recipient,
    reject_unknown_recipient_domain,
    check_sender_access hash:/etc/postfix/sender_access
    ,reject_rbl_client zen.spamhaus.org
    ,reject_rbl_client bl.spamcop.net


and add to /etc/postfix/mynetworks file
127.0.0.0/8

Reload postfix with:
systemtl reload postfix.service

« Last Edit: May 24, 2021, 07:24:24 AM by idovecer »