getting PTR error

[zuhdizoel]

hi,

i have a self hosted zimbra, and it was running normally, it could send and receive email,
but suddenly i receive a PRT error, and i dont change the server configuration at all, it just suddenly i cant send email from my zimbra to gmail account
i attach the error message
if you need other information, ill try to provide it

[phoenix]

As you've provide no evidence that your DNS settings are correct we'll have to guess at your problem. That error usually indicates that you do not have a reverse ip record for your server, you need to verify it and get it fixed if you don't have one.