We use a Telus smarthub for our internet and out of the blue our email (Apple) has stopped working normally. We have to use our data to send and receive email 99% of the time. Very occasionally we receive email but can’t seem to ever send it. We can send and receive email normally using other internet providers (we were away and used the hotel’s provider - Shaw - and everything worked fine). At home we get the error message “Cannot Send Mail The connection to the outgoing server p48-smtp.mail.me.com failed. Additional Outgoing Mail Servers can be configured for Mail accounts in Settings>Mail>Accounts.” If anyone can help please use small words and non techie language as I am an idiot with all things internet. Thanks!
I suggest deleting and re-installing your iCloud mail account. There will be an option to keep all your current mail as you do this.