Hello, @admin. I'm unable to send emails using Zoho email addresses. I tried using a Gmail address, and it worked, but using a Zoho email address isn't working. I added a debug log, and here is what it's showing:
[2025-03-05 22:57:13] Setting up SMTP with Host: smtp.zoho.com
[2025-03-05 22:57:13] SMTP Username: REDACTED
[2025-03-05 22:57:13] UserEmailTemplates initialized
[2025-03-05 22:57:13] Attempting to send verification email to: REDACTED
[2025-03-05 22:57:13] Sending email - Recipient: REDACTED, Subject: REDACTED
[2025-03-05 22:57:13] Setting up SMTP with Host: smtp.zoho.com
[2025-03-05 22:57:13] SMTP Username: REDACTED
[2025-03-05 22:57:14] SMTP Debug [2]: SERVER -> CLIENT: 552 Your IP Address is blocked from further use.
[2025-03-05 22:57:14] SMTP Debug [2]: SMTP Error: Could not connect to SMTP host.
[2025-03-05 22:57:14] Send Exception: SMTP Error: Could not connect to SMTP host.
[2025-03-05 22:57:14] PHPMailer Error Info: SMTP Error: Could not connect to SMTP host.

I contacted Zoho, and they said the IP address isn't blocked from their end. I also used the unblock IP address form, but the email is still not sending.

    Awesome As you can see from the log the access is blocked by the destination server. Only Zoho support can help in that case.

        admin, noted.
        Thank you.
        But did you confirm from your end there is no block?