Re: My mail keeps sitting in my outbox : I have wifi and my emails will not send out to anyone
Wondering if updating your MacOS version may help ...
Although iPhone 7 can not update to the latest version (iOS 17), it is compatible with MacOS 15.
(NB: Before updating, it is always a good idea to back up everything on your iPhone for safe-keeping.)
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If you haven't already updated: About iOS 15 Updates - Apple Support says: iOS 15.8 is the latest version.
and "This update provides important bug fixes and security updates and is recommended for all users".
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Else: If you have already updated: you could try restarting your iPhone
(deletes temporary files and re-establishes connections etc.) How to: Restart your iPhone - Apple Support