Zoho 5.4.6 Unusual sending activity detected.

On the /send response the Zoho provider replies with Unusual sending activity detected.

The provider Zoho have implemented a policy that disallows third parties from bulk sending, their aim being to push customers down their own Zoho campaigns solution.

Solutions:

• Short term: User unblocks the account via https://mail.zoho.com/UnblockMe
• Long term solution: use a different provider which does not have these limitations, or contact Zoho and see if there is a paid option.

Updated December 20, 2022 13:36