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Thread: Postfix smarthost + authentication: 535 incorrect authentication data

  1. #1
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    Unhappy Postfix smarthost + authentication: 535 incorrect authentication data

    On Ubuntu server 10.10, with a relay smtp server with authentication via postfix; I keep getting 535: Incorrect authentication data. I'm sure my username and password is correct.

    Heres how I set up postfix:

    I created a file called smarthosts.conf in my /etc/postfix/ directory that contains the following:
    Code:
    smtp.myisp.com username:password
    I ran the following after creation of the file:
    Code:
    sudo chown root:root /etc/postfix/
    sudo chmod 600 /etc/postfix/smarthosts.conf
    sudo postmap hash:/etc/postfix/smarthosts.conf
    My /etc/postfix/main.cf file:
    Code:
    # See /usr/share/postfix/main.cf.dist for a commented, more complete version
    
    
    # Debian specific:  Specifying a file name will cause the first
    # line of that file to be used as the name.  The Debian default
    # is /etc/mailname.
    #myorigin = /etc/mailname
    
    smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
    biff = no
    
    # appending .domain is the MUA's job.
    append_dot_mydomain = no
    
    # Uncomment the next line to generate "delayed mail" warnings
    #delay_warning_time = 4h
    
    readme_directory = no
    
    # TLS parameters
    smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
    smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
    smtpd_use_tls=yes
    smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
    smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
    
    # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
    # information on enabling SSL in the smtp client.
    
    alias_maps = hash:/etc/aliases
    alias_database = hash:/etc/aliases
    myorigin = /etc/mailname
    mydestination = localhost
    relayhost = smtp.myisp.com
    smtp_sasl_auth_enable = yes
    smtp_sasl_password_maps = hash:/etc/postfix/smarthosts.conf
    smtp_sasl_security_options =
    mailbox_size_limit = 0
    recipient_delimiter = +
    home_mailbox = /Maildir/
    When I send an e-mail, it gets stuck in the mail que. Here's the output from my mail.log file:
    Code:
    SASL authentication failed; server smtp.myisp.com[*.*.*.*] said: 535 Incorrect authentication data
    I'm sure my username/password combination is correct, but I get the feeling the settings related to security is wrong.

    my server uses plain text authentication on port 25. I would like to use security like SSL , but this particular server is unsecured.

    Any advice would be appreciated.
    Last edited by Demented ZA; March 14th, 2011 at 08:48 PM.

  2. #2
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    In the past when I've hashed for SASL, I've never done it the way you tried. I normally just call postmap on my file.
    postmap /etc/postfix/smarthosts.conf, instead of adding hash: in front of it. What do the contents of /etc/postfix/smarthosts.conf look like?
    Code:
    cat /etc/postfix/smarthosts.conf

  3. #3
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    Code:
    smtp.audca.co.za user@audca.co.za 12345
    I edited the above, as is an actual user e-mail and password, along with its server.

    I basically followed numerous guides like this one.

    How would you have done it? I tried it without the hash bit in front. Didn't seem to make a difference.

  4. #4
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    If I try setting up Thunderbird with that exact same smtp, username and pass, I can send e-mails to my gmail and other domain e-mails without a problem. That is if I use port 25, unencrypted password.

    Attached Images Attached Images

  5. #5
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    I have a hunch that my password is getting mangled from that file and is not sent to the server as I expect it to be sent, thus the invalid authentication data.

    I just don't know how to debug, and what to change?

    Btw, what is the actual message if I were to login to a server with the wrong username and password? Wouldn't it be a different error like invalid username/password?

  6. #6
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    The reason why I asked, is this is how a correctly hashed file looks...
    Code:
    [smtp.gmail.com]:587 me@gmail.com:password
    The smtp part above should match your relayhost...
    And I normally add transport_maps into my main.cf
    Code:
    transport_maps = hash:/etc/postfix/transport
    This is what I have in mine
    Code:
    root@fileserver:~# cat /etc/postfix/transport
    # This sends mail to Gmail
    gmail.com smtp:[smtp.gmail.com]:587
    Finally, your error is telling your auth info is bad, either user or password for the host you've specified.

  7. #7
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    Thanks for your reply.

    Your file looks way different than mine. Since the how-to I worked of wasn't focussed on Ubuntu, or any debian-based distribution, and I'm absolutely sure mu username+password is correct, I think my configfile is just not set up as postfix expects, and I'm sure the info that reaches the server is not what I would expect to see as my username and password.

    I'm going change my information to the format of your file and see what that does, and then post back.

    On a seperate note, what does transport_maps do? Googling it now...

  8. #8
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    Hmmm, according to Postfix.org tranpost maps are additional parameters to tell postfix what to do with certain addresses etc.

    I could be wrong, but this isn't something I need, is it? Did you configure your own transport maps, or is it a generic configuration?

  9. #9
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    Thumbs down Re: Postfix smarthost + authentication: 535 incorrect authentication data

    Brilliant, it works!

    Its just the syntax/formatting that was the problem. The moment I changed it to your layout, it worked!

    This is what it looks like now:
    Code:
    $ cat /etc/postfix/smarthosts.conf
    [smtp.audca.co.za]:25 user@audca.co.za:password
    Also, removing or prepending the "hash:" portion in postfix configuration doesn't seem to make a difference to functionality.

    From what I gather on the internet, defining hash: in the configuration like
    Code:
    smtp_sasl_password_maps = hash:/etc/postfix/smarthosts.conf
    , tells postfix to hash the file before reading it, cuircumventing the need to do a
    Code:
    postmap /etc/postfix/smarthosts.conf
    This means you can edit the postfix file directly, and not have to worry about forgetting to issue postmap command.


    Now I would like to telnet into my smtp server, see what capabilities it has, and try SSL instead of plain text.

  10. #10
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    Re: Postfix smarthost + authentication: 535 incorrect authentication data

    Great, glad you got it sorted out.

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