Same SMTP config input to primary server run well, but put to fallback error:

  • Same SMTP config input to primary server runs well, but input to fallback server error:

    5.7.8 Error: authentication failed: Invalid authentication mechanism

    • This topic was modified 3 years, 6 months ago by fordiy.
  • The topic ‘Same SMTP config input to primary server run well, but put to fallback error:’ is closed to new replies.