Custom SMTP does not work with Microsoft Office 365 / Outlook > 504 Process Timeout Error

# Bug report - [X] I confirm this is a bug with Supabase, not with my own application. - [X] I confirm I have searched the [Docs](https://docs.supabase.com), GitHub [Discussions](https://github.com/supabase/supabase/discussions), and [Discord](https://discord.supabase.com). ## Describe the bug Custom SMTP does not work with MS Office 365 or Outlook (smtp.office365.com or smtp.outlook.com) ## To Reproduce Steps to reproduce the behavior, please provide code snippets or a repository: 1. Go to 'Authentication' 2. Setup Custom SMTP for office/outlook 3. Run any built-in email functions like (Confirm signup, Invite user, Magic Link, Reset Password etc.) For example: ``` const { error } = await supabase.auth.signUp({ email, password, options: { emailRedirectTo: `${origin}/auth/callback`, }, }); ``` 4. Error received: "504: Processing this request timed out, please retry after a moment." ## Expected behavior Successfully send email to user using custom smtp and sender email ## Screenshots **Example Custom SMTP Setup:**  ## System information - OS: Windows 10 - Browser (if applies) Chrome, Firefox - Version of supabase-js: 2.49.1 - Version of Node.js: 20.16.0 ## Additional context - Tested that it works with **smtp.gmail.com** - Tested that it works using the same credential and microsoft office 365 smtp.office365.com via Python (not via supabase), signalling the issue is with supabase - Microsoft recently upgraded TLS, which may or may not be relevant https://support.microsoft.com/en-au/topic/update-to-enable-tls-1-1-and-tls-1-2-as-default-secure-protocols-in-winhttp-in-windows-c4bd73d2-31d7-761e-0178-11268bb10392 - Tested with smtp-legacy.office365.com config as well with supabase, and it's not working.