Thanks. I think that particular error just means that an email hasn't been sent to others who have posted in the thread, so it's not really too important. It may happen now and again and there's not really anything I can do about it.
Thanks for letting me know though, as it could have been something important.
The word 'smtp' in the error message means 'Simple Mail Transfer Protocol', so if you see that in an error and there doesn't seem to be any other obvious problems, then it probably just means that no emails have been sent.
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