can't send email to Yahoo accounts

Site:

Deferred: delivery temporarily suspended: lost connection with mta5.am0.yahoodns.net[98.138.112.34] while sending RCPT TO

Deferred: host mta6.am0.yahoodns.net[66.196.118.34] said: 451 4.3.2 Internal error reading data (in reply to MAIL FROM command)

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I get this message when emailing yahoo.com delivery temporarily suspended: lost connection with

mta5.am0.yahoodns.net[66.196.118.34] while sending RCPT TO