Zoho
Zoho is a range of online services for businesses. It includes an email hosting product with spam filtering, firewall, and block list features.
Domains
zoho.com
Codes
451 · 452 · 550 · 552 · 553 · 554
- 451↑
541 5.4.1 Mail rejected by destination domain
Zoho allows the receiving domain to set mail filters. The receiving domain has filters set-up that are blocking this message. To resolve this, you'll need to contact an administrator of this domain through another channel to have them adjust their filters and allow delivery.
- 452↑
452 <example@zoho.com> Mailbox delivery restricted by policy error
Zoho allows the receiving domain to set mail filters. The receiving domain has filters set-up that are blocking this message. To resolve this, you'll need to contact an administrator of this domain through another channel to have them adjust their filters and allow delivery.
452 4.3.1 Temporary System Error
This indicates that the domain at Zoho is not currently accepting email. Sending messages again in the future will most likely be successful.
- 550↑
550 5.7.1 Email rejected per DMARC policy for example.com
The email failed DMARC and you have a reject policy. Make sure your email is authenticated and aligned with SPF and/or DKIM. Contact your email provider for more details on how to configure them.
550 5.1.1 <example@zoho.com> User unknown
The email address does not exist. Check for typos or other errors.
- 552↑
- 552 5.1.1 <example@zoho.com> Mailbox delivery failure policy error
552 5.7.1 virus [name] detected by Zoho Mail
A known virus was detected in your message content, attachments, and/or URLs. Run the full message and its headers through a virus scanner to identify the source.