I had to rename my droplet to send mails, and it was renamed to my domain name, because I needed to be fqdn. When sending mails using php mail() function, it worked just fine, and the mails were received from firstname.lastname@example.org, but then I turned off my droplet, resized it, turned it on again, and now my mails that are sent using php mail are being received from something@myolddropletname that is not even a domain, so I don’t know how to fix it.
My mails look something like this:
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