550 please turn on smtp authentication in your mail client zimbra

To turn on SMTP authentication in your mail client for Zimbra, you'll need to follow these steps:

For Outlook:

  1. Open Outlook and go to File > Account Settings > Manage Profiles.
  2. Select your Zimbra account and click Properties.
  3. Go to the Advanced tab.
  4. Under Outgoing Server, select the checkbox next to My outgoing server (SMTP) requires authentication.
  5. Select Use same settings as my incoming mail server.
  6. Click OK to save the changes.

For Thunderbird:

  1. Open Thunderbird and go to Tools > Account Settings.
  2. Select your Zimbra account and click Edit.
  3. Go to the Server Settings tab.
  4. Under Outgoing Server, select the checkbox next to Use authentication.
  5. Select Use same settings as my incoming mail server.
  6. Click OK to save the changes.

For Zimbra Web Client (Webmail):

  1. Log in to your Zimbra webmail account.
  2. Click on your username in the top right corner and select Settings.
  3. Go to the Accounts tab.
  4. Click on the Edit button next to your account.
  5. Scroll down to the SMTP section.
  6. Select the checkbox next to Use authentication.
  7. Click Save to save the changes.

For Other Mail Clients:

If you're using a different mail client, you may need to consult the client's documentation or search for specific instructions on how to enable SMTP authentication.

Remember to replace the 550 error code with the actual error message you're receiving. If you're still having trouble, feel free to provide more details, and I'll do my best to help you troubleshoot the issue!