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The sender address was rejected by the server smtp.mail.yahoo.com.?

Any idea why address was rejected??? How can I check the SMPT connection? Service provider is Comcast, and until recently was working properly. Still a Yahoo Plus account. I don’t think anything has changed on the computer (iMac).

Public Comments

1. Maybe you got the address wrong or it's an email account that is being boycotted because it's suspected of sending spam.