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I have a node application in which I'm trying to use nodemailer to send e-mail using Dynadot's SMTP server. Despite using the correct username/pw, I keep getting a "Invalid login: 535 authentication failed" error. I've turned on debugging and posted the output below:

harpoon_1  | [2019-02-06 08:07:15] DEBUG Creating transport: nodemailer (5.1.1; +https://nodemailer.com/; SMTP/5.1.1[client:5.1.1])
harpoon_1  | [2019-02-06 08:07:15] DEBUG Sending mail using SMTP/5.1.1[client:5.1.1]
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] Resolved smtp.webhost.dynadot.com as 166.88.19.240 [cache miss]
harpoon_1  | [2019-02-06 08:07:15] INFO  [VBRSeFNJQs] Connection established to 166.88.19.240:25
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] S: 220 webhost.dynadot.com ESMTP
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] C: EHLO [127.0.0.1]
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] S: 250-AUTH LOGIN
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] S: 250-STARTTLS
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] S: 250 8BITMIME
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] C: STARTTLS
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] S: 220 TLS go ahead
harpoon_1  | [2019-02-06 08:07:15] INFO  [VBRSeFNJQs] Connection upgraded with STARTTLS
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] C: EHLO [127.0.0.1]
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] S: 250 8BITMIME
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] SMTP handshake finished
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] C: AUTH PLAIN AGluZm9AaGFycG9vbmNvcnAuaW8AdGVzdDEyMzQ=
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] S: 535 authentication failed
harpoon_1  | [2019-02-06 08:07:15] INFO  [VBRSeFNJQs] User "[email protected]" failed to authenticate
harpoon_1  | [2019-02-06 08:07:15] DEBUG [VBRSeFNJQs] Closing connection to the server using "end"
harpoon_1  | [2019-02-06 08:07:15] ERROR Send Error: Invalid login: 535 authentication failed
harpoon_1  | { Error: Invalid login: 535 authentication failed
harpoon_1  |     at SMTPConnection._formatError (/usr/src/app/node_modules/nodemailer/lib/smtp-connection/index.js:774:19)
harpoon_1  |     at SMTPConnection._actionAUTHComplete (/usr/src/app/node_modules/nodemailer/lib/smtp-connection/index.js:1509:34)
harpoon_1  |     at SMTPConnection._responseActions.push.str (/usr/src/app/node_modules/nodemailer/lib/smtp-connection/index.js:547:26)
harpoon_1  |     at SMTPConnection._processResponse (/usr/src/app/node_modules/nodemailer/lib/smtp-connection/index.js:933:20)
harpoon_1  |     at SMTPConnection._onData (/usr/src/app/node_modules/nodemailer/lib/smtp-connection/index.js:739:14)
harpoon_1  |     at TLSSocket._socket.on.chunk (/usr/src/app/node_modules/nodemailer/lib/smtp-connection/index.js:879:55)
harpoon_1  |     at emitOne (events.js:116:13)
harpoon_1  |     at TLSSocket.emit (events.js:211:7)
harpoon_1  |     at addChunk (_stream_readable.js:263:12)
harpoon_1  |     at readableAddChunk (_stream_readable.js:250:11)
harpoon_1  |     at TLSSocket.Readable.push (_stream_readable.js:208:10)
harpoon_1  |     at TLSWrap.onread (net.js:594:20)
harpoon_1  |   code: 'EAUTH',
harpoon_1  |   response: '535 authentication failed',
harpoon_1  |   responseCode: 535,
harpoon_1  |   command: 'AUTH PLAIN' }
harpoon_1  | [2019-02-06 08:07:15] INFO  [VBRSeFNJQs] Connection closed

Additionally, the code I'm using to configure is below for your reference:

const smtpTransport = nodemailer.createTransport({
               host: "smtp.webhost.dynadot.com",
               port: 25,
               secure: false,
               requireTLS: true,
               logger: true,
               debug: true,
               tls: {rejectUnauthorized: false},
               auth: {
                   user: '[email protected]',
                   pass: '**************'
               }
           });

Sorry for the delay on this response.
Unfortunately as nodemailer is a 3rd party software so we would not be able to trouble shoot it for you.
We suggest looking directly on their site for any information that may help you.