My Server is rejecting hotmail and outlook; Whitelists not working

Discussion in 'Installation/Configuration' started by patopattone, Sep 9, 2022.

  1. patopattone

    patopattone New Member

    Hi Howtoforge people!!! First of all english is not my languaje... sorry if I have some errors in my writing.
    I'm having trouble with my ISPConfig Server running on debian 10. My server is rejecting mails coming from hotmail.com and outlook.com; the error the sender receives is that the message was detected as suspicious or spam. The mail never reaches the inbox. I have disabled spam filter for the domain, put hotmail.com and outlook.com in spam filter whitelist and postfix whitelist; I did the latter both from the ispconfig interface (Global Filters / postfix whitelist) and using the main.cf like this in the following tutorial: https://www.howtoforge.com/how-to-whitelist-hosts- ip-addresses-in-postfix
    Emails from hotmail and outlook sometimes enter the server but most of the time they are rejected.
    Any idea what is happening?
    Thanks in advance.
     
    patopattone, Sep 9, 2022
    #1
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Post the exact error message from mail.log that gets logged when an email is rejected.
     
    till, Sep 9, 2022
    #2
    patopattone likes this.
  3. patopattone

    patopattone New Member

    Looking mail.log I think I have found the error; in the postfix whitelists on global filters I wass adding hotmail.com as sender and I have to add it as client... is this ok?
    Another newbie question: If I add hotmail.com in the postfix whitelists on global filters, do I need to add it as "rbl_override" on main.cf as mentioned in this tutorial: https://www.howtoforge.com/how-to-whitelist-hosts- ip-addresses-in-postfix
    Thanks in advance Till!!

    This is the mail.log
     
    patopattone, Sep 9, 2022
    #3
  4. till

    till Super Moderator Staff Member ISPConfig Developer

    According to the log, the email from outlook was not rejected. It even got a negative score which means it got trusted. Ading outlook to a whitelist should not be necessary at all. So most likely you have a different issue and you just cure one of the symptoms with the whitelisting. But I can't help debugging this without getting the rejection message from log. I suspect you might e.g. have an issue with Spamhaus, which started blocking legit email when using a public DNS resolver on your system, so if you use Spamhaus blacklist, either remove it from your server or take care your server uses a local DNS resolver and not Cloudflare, google or similar.

    I don't recommend using any of what's in that guide on an ISPConfig server.
     
    till, Sep 9, 2022
    #4
    patopattone likes this.
  5. patopattone

    patopattone New Member

    I have my own DNS; one on the same ISPConfig server that has the mail server too. I'm not finding a rejection message in mail.log; I have disable spamfilter in domain section of ISPConfig interface but apparently this does not disable spamhaus; which is the correct way to disable it.
     
    patopattone, Sep 9, 2022
    #5
  6. till

    till Super Moderator Staff Member ISPConfig Developer

    system > Server config > mail, email blacklists.
     
    till, Sep 9, 2022
    #6
    patopattone likes this.
  7. patopattone

    patopattone New Member

    Thanks Till!!!
     
    patopattone, Sep 9, 2022
    #7

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