ICloud email generating error SMTP has rejected address

A very strange thing just started happening this weekend. I have been an iCloud user since it was .Mac and it's been my primary email client for years. I receive about one new email every five minutes. I can send and receive email from my MacBook Pro, my iphone, my iPad, and via icloud.com. I all these platforms constantly and I've had zero issues... until yesterday.
The main email address I use is technically an alias. It's a @me address, since that's the shortest to type. Yesterday a co-worker informed me she had gotten this error message when trying to send me email (yet I've been receiving daily emails from her for months):
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550 5.1.1 unknown or illegal alias
Sure enough, I looked and realized I had not received any email all day, and I have still not received any today. Normally I receive several emails per hour. I checked my mail via icloud.com and there was nothing there either. I let it go for the rest of the day, figuring it was a server problem that Apple was working on.
This morning, however, the problem was continuing. So I tried generating a test message from icloud.com and sent it to my main alias (my primary email address, because it's easier to remember) and also to my main icloud email, which is also a @me address. The test email went through to my main icloud address with no problem but was rejected by the main alias with the same error message as above.
Next, I tried investigating my aliases. I have made no changes to any settings in quite some time, but this is what I found. When I checked my email aliases (I have 3 @me alliases beyond my main icloud id) on icloud.com, they had all vanished. Then I looked at the icloud advanced settings on my iphone. I saw that all the @me aliases remained, however my main @me alias was grayed out.
And that's where I'm at now. I thought for sure this was an Apple server problem, but I haven't seen any other messages reporting the problem, so I'm not sure how to proceed.
Thanks in advance for anyone's help!

Hi Fly Line,
My world has gone eerily quiet too.
I am in exactly the same situation but mine is an old @mac address
So like you, the main email address I use is an @mac.com alias. I get lots of emails every day for work. They all stopped coming to this alias yesterday (June 6th)
Mail was behaving oddly, but I was too busy to work out what was happening.
I've just discovered that all my original @mac alliases have disappeared from Mail on my iMac and also have disappeared when I log into iCloud via Safari
The aliases are showing up on my iPhone, but as you have said, the primary email address (mine is an @mac adddress) is greyed out. I'm not sure if that's just because it's the primary address.
The aliases ARE showing up on my Macbook Pro.
I tried sending an email from both the iMac and the Macbook. Both returned the message "The server response was: unknown or illegal alias: alias"
I havent changed any settings either. I can't help you as I am at a complete loss. I may try calling Apple on Monday. I'll let you know if I come up with anything. It would be great to hear from you if you have found a solution

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Remote SMTP server has rejected address

Hi!
My iCloud.com mail address cannot recieve any mail.
I can logon to iCloud.com using the apple id *****
Your message cannot be delivered to the following recipients:
Recipient address: ******
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550 5.7.1 ******... unknown user
Remote system: dns;mail.orcon.net.nz (TCP|17.172.204.239|51103|219.88.242.10|25) (mail.orcon.net.nz ESMTP CanIt-Appliance)
<Email Edited by Host>

Hello KjelleH,
Thanks for using Apple Support Communities.
Given the error you're receiving, it appears that the spelling of the email address is being put in incorrectly. Rather than spelling "iCloud" you have it spelled "iclod."
iCloud: Using your @icloud.com email address - Apple Support
Take care,
Alex H.

SMTP server has rejected address

When sending an email to a specific address - and only for that specific address - I always get the following message from [email protected]:
Remote SMTP server has rejected address
Diagnosecode: smtp;553 sorry, your envelope sender is in my badmailfrom list (#5.7.1)
Remote-System: dns;mail.apswiss.ch (TCP|17.148.16.105|38370|212.203.95.158|25) (vz-apm-v1.feelfree.ch ESMTP)
The same happens when I directly reply to an email from that address.
Sending the same email from my iPhone works perfectly.
What's wrong? Mail app otherwise works fine.
Any help much appreciated.THX
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This started happening to me on 8/19/2013 and happens sporadically. If you find a solution please post it I am calling apple tis AM.

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I have spent about 4-6 hours working directly with folks from Tim Cooke's office, various support levels, and through them their engineers.
As much as I tried to convince them their logic is flawed, the engineers for iCloud come back and say this is expected behavior because somehow it helps secure iCloud from being a spam source. The fine and helpful gentleman from Cooke's office now understands how it is a MobileMail.app client issue, having nothing to do with iCloud servers (because we are in fact trying to bypass their servers) still totes the "it's expected behavior" line from the server engineers.
I have implored him to follow up with the iOS MobileMail app programmers and not the iCloud programmers. I am hopeful he will. Until then you have to choose between having iCloud push and losing your online identity, or losing push email and keeping your preferred address.
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I spend $500 on a new phone. Google takes away my exchange client ability and apple makes me choose push email vs outgoing email address.

HT201342 Why would I want an iCloud email instead oh my mac,com address

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Teststand generates error ' labview has encountered a problem and needs to close'

Hi,
I am using Teststand 3.1 and Labview 7.1.
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If the array size is set to variable in Labview there is no problem but if I set it to what I require ( fixed 6 ) then when I specify module in Teststand an error message appears , ' LAbview.exe has encountered a problem and needs to close '. Then I get an 18001 about ActiveX as labview has closed.
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No bother its attached !
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Attachments:
Global_Write.vi ‏26 KB

HT4759 how do i change my iCloud email on my mac to mygmail address?

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Re: Has anyone else received a phishing, "Urgent Alert From Apple Support"? It came to my actual iCloud email address.
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I have not been able to sync my mail with iCloud on my MacBookPro (Lion OS). Everything else has been syncing fine for the past two months, but when I go to System Pref/iCloud/and try to check Mail, it asks me to choose an iCloud email address. When I

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i have updated my iphone 5s to iOS8 but it has my old icloud account, how can i change the icloud email address as i can not get passed this page??
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~Lyssa

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Welcome to the Apple community.
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This is answer is provided from my own database of boilerplate responses and the content was last reviewed and tested on: 2014/05/23
You should still be able to log into an old email account, even if you haven't used it for some time, very few providers delete email accounts.

ICloud email generating error SMTP has rejected address

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