Postfix unusual Mail relay

Discussion in 'Server Operation' started by SONiQz, Sep 19, 2014.

  1. SONiQz

    SONiQz New Member


    I have a mail server that appears to be struggling to send mail sporadically to addresses.

    Our domain name is hosted by GoDaddy, however the server is configured to direct send, so doesn't use a relay-host. The issue is that I am getting:

    to=<[email protected]>,[]:25, delay=5.4, delays=0.03/0/1.6/3.8, dsn=5.1.1, status=bounced (host[] said: 550 5.1.1 <[email protected]> Recipient not found. <> (in reply to RCPT TO command))

    I have checked that the server can resolve and that it is able to resolve the mx record for the hotmail domain and there is no issue. Also it isn't every message to hotmail, however it's only hotmail addresses affected.

    Looking at the domain it's owned by GoDaddy, but I can't see there would be any way that the message should be directed via their servers.

    Can anyone shed some light on this?

    Thanks in advance!
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Did you follow the link in the error message and read what status coe 550 means?

    There are several options, you should go to all options. Especially check the spf record of the sender domain too if it allows sending from this mailserver.
  3. SONiQz

    SONiQz New Member

    The error message comes back with:
    550 Recipient not found.

    Which according to the link is caused by:
    The recipient is not a valid email address.

    The issue here is that the responding server is not the destination server. It appears as though it is being intercepted by and not being passed to

    Bearing in mind that not all emails to hotmail addresses are doing this, I'm still getting a lot of failed messages and given the method that these messages are generated (customer supplied emails for sales confirmations) I'd expect to see more of the same from other domains or rejections for 'Recipient not found' to be coming from a server listed in hotmail's mx record.

    Last edited: Sep 19, 2014
  4. SONiQz

    SONiQz New Member

    In addition to my previous post, I have checked and validated the SPF TXT record configured. It appears to be fine and when tested returns clean results.

    Thanks in advance!
  5. SONiQz

    SONiQz New Member

    RIGHT! Well I think I have found part of the problem. Last time it occurred I ran 'dig mx' and got the result below. We do usep and as NS Records for the domain. But I don't know what we can do about it :mad: Any help would be appreciated

    ; <<>> DiG 9.8.1-P1 <<>> mx
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63460
    ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0
    ;                   IN      MX
    ;; ANSWER SECTION:            3600    IN      MX      0            3600    IN      MX      10
    ;; AUTHORITY SECTION:            3600    IN      NS            3600    IN      NS
    ;; Query time: 15 msec
    ;; SERVER:
    ;; WHEN: Wed Sep 24 15:07:37 2014
    ;; MSG SIZE  rcvd: 149

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