In IOS 18.5 I can’t e-mail pages from Safari any more

Hello

Until about a week ago, I could e-mail pages from Safari on my iPhone running iOS 18.5 to myself. Now when I do it I receive an e-mail that says

“This is the mail system at host m.dfwinfotech.com.

I'm sorry to have to inform you that your message could not

be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster

I have no idea what m.dfwinfotech.com is and why this started.

Any suggestions?

It doesn’t happen when I do the same from my iPad.

Thank you!