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.
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
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.
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.
