Last week I started having problems sending emails to Yahoo email addresses. This started to become quite annoying and was starting to affect my online business. Whenever I sent an email it would bounce back and I would get the following message sent back:

5.1.0 – Unknown address error 554-’Message not allowed – [320]‘

I scoured the net looking for a solution but everyone kept saying that it was the ISP’s fault and that I should contact them to fix it. The only problem was that I didn’t really think it was my ISP’s problem only because I could send emails perfectly with my laptop. The problem only seemed to be occurring on my desktop PC.

But I emailed the support section of my internet service provider anyway just in case they knew something I didn’t. It wasn’t surprising when they came back and said that they couldn’t see a problem at their end.

So I put up with the problem for another few days and finally got my brother (who knows a lot more about computers than I do) to take a look.

Within a few minutes he had solved the problem and it was so simple. The date on my computer had been changed at some point and was showing a month ahead. This would have meant that any emails that I sent out would have been date stamped a month in the future. Obviously the Yahoo mail system doesn’t like this and so it bounced back my emails.

So problem solved and I am back to sending emails again.

Hopefully this will help anyone with the same problem.