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 zoho.com
This is related to using a zoho.com address from an external service or app without the Zoho SMTP settings in those apps.
- 550 5.1.1 <example@zoho.com> User unknown
- 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.