Hello! My goal is to prevent our system from sending email to addresses that for sure does not work, and attempt to send only email that has a chance of being delivered.
I have this in my Postfix configuration: smtpd_recipient_restrictions = reject_non_fqdn_recipient, reject_unknown_recipient_domain, check_recipient_access hash:/etc/postfix/recipient_access And recipient_access contents: @example.com reject If somebody sends email to j...@example.com the email is rejected as expected. Also, as expected, if somebody sends email with "john@example" the email is not delivered since "example" is not a fully qualified domain. However if the email has multiple recipients and all other addresses are valid but one, the whole mail is rejected by Postfix. Example: $ example-sendmail-wrapper "To: j...@real-address.com, john@example" sendmail: recipient address john@example not accepted by the server sendmail: server message: 450 4.1.2 <john@example>: Recipient address rejected: Domain not found Rejecting john@example is correct here. However, when this happens, j...@real-address.com will not get her message, which is a problem. How can I configure Postfix so that _only_ malformed addresses are not delivered to the next SMTP host, while the rest of the recipients in the same email/To/CC/BCC are delivered as usual? - Otto
