I am trying to set up a mail server for my client's web app.
The CentOS / Postfix-based mail server runs on a dedicated VPS from Digital COS.
SPF Record: Check DKIM (Open DKIM): Clear IP: Check Domain: Check
Gmail, Yahoo, Zoho Mail, GMX / Mail.com, Yandex Mail - There is absolutely no problem, all emails are delivered in the inbox.
However, it is junk when sending to AOL and Live / Outlook / Hotmail users. I tried all types of content: plain text emails with some words, HTML-rich email and everything in between This issue is not related to e-mail content.
Microsoft's support does not help much because our servers are basically feeling OK and there is something that they do not have to trigger their smartcrycurity protection.
This new mail server is available before appropriate DNS entries, Reverse DNS entry was promoted from Obviously it blocked the mail server by those providers. Therefore, the reverse DNS entry does not guarantee any error because of today's investigation.
In addition to what I have learned on this occasion, this provider re-server all restricted fairs. Once you are on the blacklist, you will be there for a long time. As our first mail server can be fortunately restored, we can periodically check what AOL and Yahoo will do with a new (second MX). The mail server was blocked for two months, as long as we did not formally apply to the blacklist, until the mail server was configured with DKIM etc.
With AOL you should make proper use of this application to remove it from your blacklist; Let's say Hotmail has something similar.
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