Hi Gerry2354,
it could be a settings issue on your Iphone/Ipad have you tried going through this setup guide for Iphone/Ipad setup to check that you have the correct settings for sending mail ?
Markp
Hi @Gerry2354
As far as i know Office 365 has different outgoing server ports depending where you are in the world, change the server port and you will be able to send.
Try the ports 25, 443, 587.
Also worth while trying on both 3/4g and wifi
Hope this helps
Burkem5