Today I received an email from someone I email often. I sent a Reply and got this failure message: Unknown address error 550-'Relaying is not permitted' DEspite this I think it was received as i use msgtag and that was triggered a few minutes later.
Can anyone tell me what the error message means, please?
thanks everyone. I'm none the wiser, in spite of your efforts! especially as this error came out of the blue - I often email this particular person, have done for years without problems and no settings have been changed on my pc. thanks all the same . I'll tick resolved.
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