Unable to Send Emails – Outgoing Mail Blocked (Error 554 5.1.8)

Unable to Send Emails – Outgoing Mail Blocked (Error 554 5.1.8)

Description:
Hello Zoho Support Team,

I am facing an issue with my Zoho Mail account (
admin@osamarahmani.tech
). Whenever I try to send an email, I get the following error:

554 5.1.8 Email Outgoing Blocked

I would like to clarify that I have not done any spamming or bulk emailing. I was only exploring Zoho Mail features, and suddenly this block appeared.

This is very disappointing, as I did not violate any policies. Please help me resolve this and unblock outgoing mails for my account.

Thank you,
Osama Rahmani