I’m trying to install postfix and get it working on a Ubuntu 20.04 server. I’ve followed the guide and while sending email I get following error:
refused to talk to me: 554-kundenserver.de (mxeue111) Nemesis ESMTP Service not available 554-No SMTP service 554-Bad DNS PTR resource record. 554 For explanation visit
I’ve followed the guide to rename the droplet which I did with mydomain.com but still having same issue.
How to fix it?
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