send email failed by office365 smtp

[carlos411]

Describe the bug

send email failed by office365 smtp

To Reproduce

My Code:

import { SMTPClient } from "https://deno.land/x/denomailer@1.6.0/mod.ts"

const client = new SMTPClient({
  debug: {
    log: true
  },
  connection: {
    hostname: "smtp.office365.com",
    port: 587,
    tls: false,
    auth: {
      username: "my_email",
      password: "my_password"
    }
  }
});

await client.send({
  from: "ServiceName <my_email>",
  to: "ReceiverName <other_email>",
  subject: "my subject test",
  html: "<h1>this is heading</h1>"
});

await client.close();

Expected behavior

Send email normally.

Logs

deno --version output:

deno 1.33.4 (release, x86_64-apple-darwin)
v8 11.4.183.2
typescript 5.0.4

debug output log

used resolved config
.debug
┌───────────────┬────────┐
│ (idx)         │ Values │
├───────────────┼────────┤
│ log           │ true   │
│ allowUnsecure │ false  │
│ encodeLB      │ false  │
│ noStartTLS    │ false  │
└───────────────┴────────┘
.connection
┌──────────┬───────────────────────────────────────────────────────────────┐
│ (idx)    │ Values                                                        │
├──────────┼───────────────────────────────────────────────────────────────┤
│ hostname │ "smtp.office365.com"                                          │
│ port     │ 587                                                           │
│ tls      │ false                                                         │
│ auth     │ '{"username":"my_email","password":"my_password"}' │
└──────────┴───────────────────────────────────────────────────────────────┘
.pool
undefined
220 TYWPR01CA0019.outlook.office365.com Microsoft ESMTP MAIL Service ready at Tue, 23 May 2023 15:35:07 +0000
┌───────┬──────────────────────┐
│ (idx) │ Values               │
├───────┼──────────────────────┤
│     0 │ "EHLO"               │
│     1 │ "smtp.office365.com" │
└───────┴──────────────────────┘
250-TYWPR01CA0019.outlook.office365.com Hello [219.68.233.17]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
┌───────┬────────────┐
│ (idx) │ Values     │
├───────┼────────────┤
│     0 │ "STARTTLS" │
└───────┴────────────┘
error: Uncaught (in promise) Error: invalid cmd
      throw new Error(`invalid cmd`);
            ^
    at SMTPConnection.assertCode (https://deno.land/x/denomailer@1.6.0/client/basic/connection.ts:76:13)
    at SMTPConnection.writeCmdAndAssert (https://deno.land/x/denomailer@1.6.0/client/basic/connection.ts:132:10)
    at eventLoopTick (ext:core/01_core.js:181:11)

Could you help to fix it? Thanks a lot!
On the other hand, If I use Node.js package NODEMAILER under Node.js environment, it can send email normally.

[birgersp]

Having this problem as well, though not with office365, but a different (official) mailserver

EDIT: I also tried using the nodemailer package (imported to deno) and there it works