Can’t send mails on iPhone hotmail account. Receive no problem. Also no problem at all on notebook (Windows 10).

Remove your email account and set it up again

Make sure that all of your emails are there or make sure that your email is saved somewhere other than your device. On your device, go to Settings > Mail, then tap Accounts. Tap the email account that you want to remove. Tap Delete Account.

If you can't receive email on your iPhone, iPad, or iPod touch ...

If you can't send an email on your iPhone, iPad or iPod touch

1. When you make an iOS or iPadOS backup in iCloud or iTunes, it backs up your mail settings, but not your email. ... 
2. Make sure your device is connected to the Internet.
3. Check with your email service provider to find out if there's a service outage.

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If you can't send an email on your iPhone, iPad or iPod touch ...

You probably haven’t entered your user id and password for the outgoing hotmail server. An email account needs separate user id and password for incoming and outgoing servers. If it is an IMAP or Exchange account just delete the account, restart your phone, and add the account back. Or go to Settings/Mail/Accounts, tap on the hotmail account, and set up the outgoing mail server.