Hello,
I couldnt find this on the internet and is was thinking, the postfix list wil know this. Customer send email which are rejected by my server. I thinks that is correctly rejected. Now i digged into this and i found the following but i dont know if this is allowed by RFC. To me this should not be done but if someone can conform this, that would make me happy. Log part Dec 15 14:22:23 mailrelay postfix/smtpd[3361]: NOQUEUE: reject: RCPT from unknown[1.2.3.4]: 554 5.7.1 ,<host.domain.tld>: Helo command rejected: Host not found; from=<XXXX@DOMAIN2.TLD2> to=<mym...@myoffice.tld> proto=ESMTP helo=<host.domain.tld > What i found is that the helo hostname is correctly set but the strange thing. Ping host.domain.tld result : 1.2.3.4 Ping host.domain.tld result : 4.3.2.1 So the hostname resolve to 2 ipnumbers. Both ipnumbers have a PTR record. Now the thing i dont get. 1) if both ipnumbers have a hostname, why do i see : unknown[1.2.3.4] 2) are Round Robin A record for mail Allowed. Thank you in advance. Greetz, Louis
