PTR record, mail servers = at lost
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i changed my PTR record on droplet but my mails when somebody recive them still have cname and not A name just.That's expected. The PTR record doesn't set what domain your emails appear to come from. It'll default to your mailserver's hostname. You will have to overwrite the From: header manually.
i cant receive themWhat's the output of the following command?
sudo netstat -plutn