postfix - how to get "domain not found" to NOT retry for 5 days

Discussion in 'Server Operation' started by CNBarnes, Sep 17, 2008.

  1. CNBarnes

    CNBarnes New Member

    I have poured over the postfix man pages, but can't figure out the correct setting for the postfix/main.cf file.

    Problem: one of my users sends email to [email protected].

    Rather than rejecting the message (bouncing it back) immediately, postfix tries for 5 days to deliver to the non-existant domain, then bounces. I am sure this is a simple 1 liner, but danged if I can find it...

    TIA
     
    CNBarnes, Sep 17, 2008
    #1
  2. CNBarnes

    CNBarnes New Member

    Followup to my own message

    The log file shows this:

    Sep 17 11:38:29 vmmail postfix/smtp[5799]: 60ABD305DA: to=<[email protected]>, relay=smtp-relay.tamu.edu[165.91.22.120]:25, delay=0.04, delays=0.02/0/0.01/0.01, dsn=4.1.2, status=deferred (host smtp-relay.tamu.edu[165.91.22.120] said: 450 4.1.2 <[email protected]>: Recipient address rejected: Domain not found (in reply to RCPT TO command))


    I suspect changing the value of this error condition to 550 is what I want to do, but I am not sure what the error condition "name" is.
     
    CNBarnes, Sep 17, 2008
    #2
  3. falko

    falko Super Moderator Howtoforge Staff

    You can try this:

    Code:
    unknown_address_reject_code = 554
unknown_hostname_reject_code = 554
     
    falko, Sep 18, 2008
    #3
  4. CNBarnes

    CNBarnes New Member

    I put it in.. .the logs still show a 450.


    Sep 18 12:44:55 vmmail postfix/smtp[7620]: D1FD530324: to=<[email protected]>, relay=smtp-relay.tamu.edu[165.91.22.120]:25, delay=88614, delays=88614/0/0.01/0.04, dsn=4.1.2, status=deferred (host smtp-relay.tamu.edu[165.91.22.120] said: 450 4.1.2 <[email protected]>: Recipient address rejected: Domain not found (in reply to RCPT TO command))
     
    CNBarnes, Sep 18, 2008
    #4
  5. CNBarnes

    CNBarnes New Member

    Hmm. It appears that the 450 message is not coming from my server (physics.tamu.edu), but instead smtp-relay.tamu.edu (the server relaying for us).

    I assume changing the error condition setting on that server is what I need to do?
     
    CNBarnes, Sep 19, 2008
    #5
  6. falko

    falko Super Moderator Howtoforge Staff

    I'd say yes. :)
     
    falko, Sep 19, 2008
    #6
  7. CNBarnes

    CNBarnes New Member

    I talked to the sysadmins of the guys who run the other server, and it is indeed their server that is generating the 450.

    Their response was:

    Honestly, I can see their argument - some DNS lookups will be transient (eg. simply lost contact with your local DNS server) where you don't want a 550 level failure response. Otoh, taking 5 days for a domain lookup to fail on a domain that does not exist is also clearly a problem.


    So... what is the solution to this dilemma?
     
    CNBarnes, Sep 19, 2008
    #7
  8. CNBarnes

    CNBarnes New Member

    bump

    So does anyone have an argument for/against having this sort of bounce be a 450 vs 550 type?
     
    CNBarnes, Sep 29, 2008
    #8
  9. Bill_KC

    Bill_KC New Member

    postfix - how to get "host not found" to NOT retry for 5 days

    I have a exact same situation with the exception that I do not have an error code 450. My mail.log entry looks like this:

    Oct 24 13:53:09 vegas postfix/smtp[26081]: 27DC750870C: to=<[email protected]>, relay=none, delay=90919, delays=90898/0.68/20/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=sysxxxxx.com type=MX: Host not found, try again)

    What entry can i include in my main.cf so that mails are sent back to the sender if the host or domain/host can't be found and not linger in the retry queue for 5 days?

    Thanks Bill KC.
     
    Bill_KC, Oct 24, 2008
    #9

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