Outlook cannot connect to your outgoing SMTP e-mail server

Outlook cannot connect to your outgoing SMTP e-mail server

Hello,

When I try to send an email from outlook I receive the following message: "Outlook cannot connect to your outgoing SMTP e-mail server...."

I use zoho for around 6 months and it worked fine. BTW I can still receive email messages.

Thank you.

Best Regards,
George