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Troubleshooting: Errors with Adding an Inbox

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By Andrii Lenyk

January 23, 2024

Troubleshooting: Errors with Adding an Inbox

The way you add an inbox for sending in Mailarrow depends on the type of email account. For Gmail and Outlook inboxes, you can sign in using your Google or Microsoft account. However, adding Custom Inboxes can be a bit more complex since it involves manually setting up the IMAP & SMTP Settings.

💡 Note: Currently, email servers with insecure connections are not supported for security reasons.

Adding an inbox may encounter issues depending on the email provider or how the IMAP & SMTP settings are configured. Here are common errors that can occur when adding an inbox and how to resolve them:

Error: Network error: Unexpected token < in JSON at position 0

Reason 1: Wrong Port Number, Credentials, or Server Address used.

  • Try changing the port number (We only support TLS & SSL).
  • Make sure that the login credentials used are correct. Some email provider requires generating a special password when using third-party apps.
  • Check help articles or reach out to your domain provider to verify if the correct Server address is used.

Reason 2: IMAP Settings is not enabled. 

  • Some email providers require a paid subscription for IMAP. Make sure that IMAP settings are enabled. 
  • If unsure, reach out to your email provider.

Unknown Mailbox: [Gmail](now in authenticated state)(Failure)

Reason 1: We have Gmail integration. Gmail inboxes can't be added by manually setting up IMAP & SMTP settings.

  • To add a Gmail inbox, simply sign in using Google. 
  • If there's a need to use different SMTP settings, add the inbox by signing in to Gmail first, and then set up a custom SMTP.  Here's a guide on how to set up a custom SMTP.

Cannot Connect to Server (Does not match the server certificate)

Reason 1: Wrong Port Number, Credentials, or Server Address used.

  • Try changing the port number (We only support TLS & SSL).
  • Make sure that the login credentials used are correct. Some email provider requires generating a special password when using third-party apps.
  • Check help articles or reach out to your domain provider to verify if the correct Server address is used. 

Reason 2: SMTP Settings is not enabled. 

  • Some email providers require a paid subscription for SMTP. Make sure that SMTP settings are enabled. 
  • If unsure, reach out to your email provider.

535-5.7.8 Username and Password not accepted

Reason 1: Invalid username and password is used

  • Double check username and password used.
  • Verify if account is not disabled.

Reason 2: Less Secure Apps are not enabled

  • Make sure they are enabled by checking the settings in these links:
  1. Less Secure Apps (Admin Side)
  2. Less Secure Apps (Inbox Side)
  • If Less Secure Apps are enabled, try disabling and re-enabling it.

Email already exists in Mailarrow, contact hi@mailarrow.com to resolve this

Reason 1: This means that the inbox has already been added to a different account. An inbox can't be used in multiple accounts at the same time.

  • The inbox must be deleted from an old account to add it to a new account. 

  • Contact hi@mailarrow.com if you're unable to locate or delete the inbox from your end.

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