421 - SMTP timeout - Githubissues

Using SMTP Test I have been testing my smtp server, The email is received but then it throws this error

<< 220 mail.whytewebart.com ESMTP
>> EHLO [172.31.11.248]
<< 250-mail.host.com Nice to meet you, ec2-54-212-131-181.us-west-2.compute.amazonaws.com
<< 250-PIPELINING
<< 250-8BITMIME
<< 250-SMTPUTF8
<< 250 AUTH LOGIN PLAIN
>> AUTH PLAIN AGVtbWFudWVsQHdoeXRld2ViYXJ0LmNvbQB3aHl0ZTUwLnI1
<< 235 Authentication successful
>> MAIL FROM:<user@host.com>
>> RCPT TO:<user@host.com>
<< 250 Accepted
<< 250 Accepted
>> DATA
<< 354 End data with <CR><LF>.<CR><LF>
>> From: user@host.com
>> Date: Sun, 09 Apr 2023 15:08:59 퍍
>> Subject: SMTP test from mail.host.com
>> Message-Id: <YCTFCN55NJU4.7U2GAJ9KNZ4A1@WIN-AUIR3RRGP88>
>> To: user@host.com
>> MIME-Version: 1.0
>> Content-Type: multipart/alternative; boundary="=-sRnPrL0YZzLDStyDxaSe3g=="
>>
>> --=-sRnPrL0YZzLDStyDxaSe3g==
>> Content-Type: text/plain; charset=utf-8
>>
>> Test message
>> --=-sRnPrL0YZzLDStyDxaSe3g==
>> Content-Type: text/html; charset=utf-8
>> Content-Id: <YCTFCN55NJU4.JBXYSI2FKA2Y@WIN-AUIR3RRGP88>
>>
>> <b>Test message</b>
>> --=-sRnPrL0YZzLDStyDxaSe3g==--
>> .
<< 421 Timeout - closing connection
>> RSET
ERROR: Timeout - closing connection

I honestly don't understand what's going on anymore, My DNS is properly set up, with the exception of dkims keys. Here is my code

const server = new SMTPServer({
        logger: true,
        secure: true,
        ca: [fs.readFileSync(`${fastify.dirname()}/private.key`), fs.readFileSync(`${fastify.dirname()}/server.csr`),],

        keepAlive: true,
        onAuth(auth, session, callback) {
            let username = 'user@host.com';
            let password = 'passcode';

            // check username and password
            if (
                auth.username === username &&
                (auth.method === 'CRAM-MD5'
                    ? auth.validatePassword(password) // if cram-md5, validate challenge response
                    : auth.password === password) // for other methods match plaintext passwords
            ) {
                return callback(null, {
                    user: 'userdata' //
                });
            }

            return callback(new Error('Authentication failed'));
        },

        onData(stream, session, callback) {
            simpleParser(stream, {}, (err, parsed) => {
                if (err)
                    console.log("Error:", err)

                console.log(parsed);
                console.log(chalk.redBright("Recieved an email right about now"))
                // stream.on("end", callback)
            })
        },
        onConnect(session, callback) {
            console.log("SMTP connection established.");
            callback(null);
        },
        onClose(session, callback) {
            console.log("SMTP connection closed.");
        }
    });

    server.on("error", err => {
        console.log("Error %s", err.message);
    });

    server.listen(465, () => {
        console.log(chalk.yellowBright("started smtp server"))
    })

The server is being hosted on Digital ocean, using Nginx proxy, Nodejs version v16.13.1, Pm2 to keep the server going.

nodemailer / smtp-server

421 - SMTP timeout #190