How to Fix the Unknown address error 554 Message not allowed Error
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.
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help. 
Thanks…I had the same problem and you helped me solve it!
Glad I could help Linda. It is an annoying little problem but thankfully the fix is a simple one.
Me too – found thie article swiftly and it resolved my issue.
many thanks
Thank you – the problem drove me nuts! Now I’m able to send mails again! Yi-Haa
I’ve been having a problem with returned emails for weeks – Tiscali were no help so I was thinking of setting up a different email. Have just reset the date which was a few days out and all seems good – so many thanks.
Great to see your problem has been fixed Jan. My ISP were no help either – they had no idea what the problem was.
THANK YOU – computer problems can be a bit intimidating and your solution was concise and clear. Thanks so much.
Thanks for the feedback Kate…much appreciated.
Change of date – that was it ! great thanks,
No worries, glad we could help.
Too funny – been dealing with this for a couple weeks now and just tonight decided to google the error – much thanks for the cure – now if I could figure out how the date got changed in the first place?? ;0)
Yes good question Rob. It’s not like anyone uses my computer and I don’t mess around with the date so not sure how mine got changed.
You saved my life…I knew my 3 year old nephew had to do something to it. I saw him with the calendar open…thanks again.
Great to see it fixed the problem for you Darlene.
thank you, thank you ! SBC/ATT wanted me to reinstall outlook !! It was a silly little date change!
My isp had no idea either…and it’s such a simple thing.
You are awesome! I was pulling my hair out!!
Thanks so much for the simple fix!
No problem, it was definitely a fix worth sharing.
This problem has been driving me mad and puzzling my computer guru. You seem to have solved it. The clock on my computer was saying “June” instead of “February”! Thank you so much.
It’s just one of those annoying things that could take a month of Sundays to figure out. Glad it fixed your problem.
Fixed the problem. Thanks…
-Phil
Excellent – good to see it is helping people out.
wow! Thanks…I use my email for business too and I just had a rash of returns. I searched for the error message and came up with this…and yup, it’s February and my computer is somehow set for June…
Great to see it worked for you Joe.
thank you so much that fixed my problem.
Love the solution short and sweet
thanks
Yes, definitely! It would have to be one of the simplest fixes ever.
Thanks a lot!
Simple fix, very useful.
Greetings from Brazil.
Thank you for posting this! I had the same problem and noticed last night that my incoming emails were coming from the ‘future’ (it was 10pm, incoming emails on my laptop were saying 11pm). Then, today, I noticed that my clock was a month ahead on my laptop.
When I cut & paste the message error in google, your site was the first to pop up & I am glad it did. It was an easy fix!
Thanks again!
Shannon Ensor´s last blog ..$282000 MLS® 5922 Mesa Verde Circle
Nice to see we are ranking no.1 in Google for the error message. When I first had the problem, I had trouble finding a solution to it in Google.
Thanks a lot paula. Got the problem solved very easily because of your help. Thanks once again.
Thanks so much for your fix. Googled the error message and found your post. I’ve been round and round with ATT.Yahoo and Outlook Express online and could not find what was wrong. The date change did the trick. Thank you, thank you, thank you.