URGENT: Business Email Disruption – SMTP Authentication Failed

URGENT: Business Email Disruption – SMTP Authentication Failed

Dear Zoho Support,

I am writing to escalate a critical issue with my business email account:
📧
marek@olbrys.de

  • My domain olbrys.de is fully verified in Zoho (MX, SPF, DKIM, DMARC all valid – green status).

  • I am using the correct configuration: smtp.zoho.eu / port 587 (TLS) and App Password.

  • Despite this, every attempt to send mail fails with: 535 Authentication Failed.

  • The issue persists across different ports (465 SSL / 587 TLS) and after generating new App Passwords.

This is not a configuration error – everything on my side is correct. The problem is clearly on the Zoho server side.

⚠️ As a direct result, I cannot send or receive client emails. This situation is business critical: I am at risk of losing contracts worth millions of euros due to undelivered messages.

I expect immediate resolution and urgent escalation to the technical team. Please ensure that SMTP/IMAP access is fully enabled for my account without further delay.

If this service disruption is not resolved immediately, I will be forced to consider requesting a refund and reporting Zoho to consumer protection agencies, as this is a paid service that is not functioning as advertised.

Please treat this as high priority and respond with confirmation of action taken.

Best regards,
Marek Olbrys
marek@olbrys.de

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