Cannot send message using SMTP server

I configured my iCloud account with OS Sierra 10.13.6. When I go to Mail I can receive emails without any issues but I cannot send.

I have researched around the web and these are the steps I have tried:

Under Mail - Preferences - Accounts, I selected my iCloud account (which shows IMAP). Under the Server Settings tab - Outgoing Mail Account I added SMTP.mail.me.com.

I added my iCloud email under User Name. Entered my password. Under host name I entered smtp.mail.me.com. I checked the option for automatically manage my connection settings.

Still the SMTP account shows offline. This is the error I get:

Cannot send message using the server SMTP

Connections to the server “smtp.mail.me.com” on the default ports timed out.

Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be sent.

Please help!