iCloud mail isn’t receiving or letting me send any mails, when sending an email I get this message “Cannot Send Mail. The Username Or Password For “iCloud” is incorrect.”

Whenever I send an email from my iCloud I get the popup saying “Cannot send mail. The username or password for “iCloud” is incorrect.” I only receive mails from apple but no website or app is giving my verification code or verification emails to confirm its me, so now I’m stuck in those apps asking me to confirm as I’m not receiving any.

I went on another device to send a mail to my iCloud email to have this message appear: Cannot Send Mail. The connection to the outgoing server “p30-smpt.mail.me.com” failed. Additional Outgoing Mail Servers can be configured for Mail accounts in Settings > Mail > Accounts. No space left on device.