can receive but not send email

Hi

I can't send any mails from iPhone on either account but i can from my laptop (windows)

I can receive email on both accounts on my iPhone.

I just get the error message rejected by server can't understand it, it was working fine up until lunchtime today and i didn't update, add or change anything. Tried it with wifi turned off and just same

Oh dear

Network reset has not solved the issue

However i can't do full reset as the second 4 digit passcode is lost i've tried the numbers i usually use but to no avail

I think i'm proper stuck. So confused as to how this has gone. Would restoring from an earlier back up be worth a go?

Tried it, restored from September which meant I did lose some stuff so not happy, and it made no difference at all! So I went to bed. Tried it while out today and works fine! Not a clue as to why. Oddly the other account , Hotmail, still won’t work from the mail icon but does work from the App!

Thanks for your help, I am none the wiser but I can send mail 😁

Thanks but there is nothing on there that i haven't done already and it still wont work