Email not delivered to mailbox

Discussion in 'Server Operation' started by J Paul, May 18, 2018.

  1. J Paul

    J Paul New Member

    I have email not being delivered from specific domains. I have turned off anti-virus / spam filtering for the receiving email. Incoming email shows in log as follows:
    May 18 10:27:01 renmus postfix/smtpd[9031]: NOQUEUE: filter: RCPT from unknown[##.##.##.###]: <[email protected]#########.com>: Sender address triggers FILTER amavis:[127.0.0.1]:10024; from=<[email protected]#########.com> to=<[email protected]#########.com> proto=ESMTP helo=<out.exch080.#########.net>
    May 18 10:27:01 renmus postfix/smtpd[9031]: NOQUEUE: reject: RCPT from unknown[##.##.##.###]: 450 4.7.1 <out.exch080.#########.net>: Helo command rejected: Host not found; from=<[email protected]#########.com> to=<[email protected]#########.com> proto=ESMTP helo=<out.exch080.#########.net>
    Is there a way to correct this?; reverse server lookup appears to be preventing delivery. How can I allow for this domain to pass?
    Thank you in advance for your assistance.
     
  2. ztk.me

    ztk.me ISPConfig Developer ISPConfig Developer

    it can't find the host "out.exch080.#####.net" right? is it something like your internal exchange-server with some domain not real for the outside world? Add it to the /etc/hosts file or change the authentication, use port 587 tls and auth before sending.
    or delete the reject_invalid_host ( something like that, off the head ) value for senders, which might be bad.
     
    J Paul likes this.
  3. J Paul

    J Paul New Member

    Thanks for the help - you got me on the right path.
    Removed the following smtpd_helo_restrictions: reject_invalid_hostname, reject_non_fqdn_hostname, reject_invalid_helo_hostname, reject_unknown_helo_hostname.
    I don't know if this is good practice as their hostname does not resolve to an IP address. I hope that I am not introducing trouble on my end to accommodate someone else's issue. If anyone has a comment on this change, please comment.
    Thanks again.
     

Share This Page