That is the error message I keep getting when I try to send a plain text email with no file attachements. I am trying to send the email using my ISP account - not a yahoo or gmail account.
I regularly email newsletters to a community group with a wide variety of email domain names. No problem.
I suspect the problem sending this particular email rests on the receiving end.
4. Also, your SMTP account may not be authenticating correctly
and the server thinks that you're trying to relay mail through it without the proper credentials. Anonymous email relays aren't allowed by most mail server administrators because of spam.
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