Email notification error

Seeing this error

javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
com.sun.mail.smtp.SMTPAddressFailedException: 553-5.1.2 We weren't able to find the recipient domain. Please check for any
553-5.1.2 spelling errors, and make sure you didn't enter any spaces, periods,
553 5.1.2 or other punctuation after the recipient's email address. x10sm2676048oes.6 - gsmtp
Any idea. I know the addresses are right. We started seeing this thing all of a sudden. Thx

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