I cant send email from my iphone and its according to my service provider its a certificate issue

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 ...

howannoyingusername Said:

"I cant send email from my iphone and its according to my service provider its a certificate issue: Webmail says its not them but Apple"

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Troubleshooting Certificate Issues:

Refer to the link provided atop this post.

Which email account --> Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other