521 5.2.1 : AOL will not accept delivery of this message

When sending email to an AOL account through Outlook (any version) and through multiple email accounts going through our company email server, we get the error code 521 5.2.1 :  AOL will not accept delivery of this message

None of the accounts have "AOL" in their description and we have tried several ports for the outbound setting. When sending using Mac Mail on the same computer as outlook, or sending directly through our mail server interface, the email goes through to the AOL recipient. OUr mail server people say it is nothing to do with their system, but I question that at this point. It either has to be something caused by outlook or something on our server settings. Any thoughts?
 

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Last updated April 11, 2019 Views 82,918 Applies to:

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If you do a search on the phrase "AOL will not accept delivery of this message" - you'll find countless results regarding this error across multiple email clients spanning multiple years. You may want to go through some of them to see if some of the various "solutions" will work for you.



Karl Timmermans [Outlook MVP]
"Outlook Contact Import/Export/Data Mgmt"
http://www.contactgenie.com
http://www.contactgenie.info

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Thanks Karl, this has been going on for a week and I have spent hours trying various "solutions" found on other posts with no luck. So that is why I have posted here before totally giving up.

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Hi Jeff,

 

You may configure the same email account in Windows live mail on the same computer and check if the email account works fine as expected.

 

I hope the above information helps. Let us know if you need further assistance.

Thank you.

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If you do a search on the phrase "AOL will not accept delivery of this message" - you'll find countless results regarding this error across multiple email clients spanning multiple years. You may want to go through some of them to see if some of the various "solutions" will work for you.




Except when you search for that as I have you end up at hundreds of threads like this that have no answers. The singular "solution" I've found so far after much searching is only applicable if you have the word "aol" in your sender name, which I do not. Therefore, there are no solutions I have found anywhere that apply. Add to that the fact that AOL's own SMTP error page does not list this error and you have a very frustrating situation with no solution.

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#1 - Just because you are encountering a problem when Outlook is in use does not automatically make it an Outlook based problem. Just because AOL has decided not to deal with the issue by way of answers or solutions also does not make it everyone else's problem to fix


#2 - Taking 2 returned links repeating the same search where Outlook is not mentioned - (the reply in the Google forum identifies a possible cause/solution that apparently worked for one person that does not involve having AOL in the displayname - the most common problem.)


Mail Delivery Subsystem error
http://productforums.google.com/forum/#!msg/gmail/2mEjML-8D9E/6CB-xLkDGu4J


Why am I receiving a "521 5.2.1" error from AOL?
http://www.perfectmail.com/kb/100105


#3 - In short, this is an issue stemming from AOL servers and they are the ones that need to address it


#4 - To repeat something I state here repeatedly - when dealing with problems, there are two components to any issue - "the symptom" (<521 5.2.1" error from AOL> in this case) and "the cause". Multiple causes can result in similar to virtually identical symptoms. Bottom line - error 521 is something that is being returned from a server to Outlook, it is not generated by Outlook by itself

Karl Timmermans [Outlook MVP]
"Outlook Contact Import/Export/Data Mgmt"
http://www.contactgenie.com
http://www.contactgenie.info

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Gina Whipp
Microsoft MVP (Access 2010-2015)
https://www.access-diva.com/tips.html

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I hate people like Karl.  If you don't have something useful to add then just go away.  Telling people to go Google their problem is such a douche response.

I came this problem because I setup my NAS to send me emails when something goes wrong (like backup is full so it failed).  I had setup my NAS to use my work email server to send email to *** Email address is removed for privacy *** and it was from *** Email address is removed for privacy ***.

At first it worked for YEARS.  But then all of a sudden the emails stopped and I received these errors:

mtain-dk01.r1000.mx.aol.com #521 5.2.1 : AOL will not accept delivery of this message. ##

The solution for me was simple....change the emails to be To:*** Email address is removed for privacy ***....From:*** Email address is removed for privacy ***

All in all though, this error comes up when the email in question looks too much like spam or your email server was flagged as a known spammer.

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All in all though, this error comes up when the email in question looks too much like spam or your email server was flagged as a known spammer.


So how exactly is changing the email address an Outlook "problem" and different from provided options  when it's AOL that doesn't accept it? (rhetorical question).


Karl Timmermans [Outlook MVP]
"Outlook Contact Import/Export/Data Mgmt"
http://www.contactgenie.com
http://www.contactgenie.info

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Again, nothing you've said is helpful to anyone.  Someone was having an issue WHILE USING Outlook.  There is nothing wrong with starting out here for solutions.  Outlook will not always be the problem.

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So to recap for others reading this


Is your suggested solution for anyone encountering this problem "to simply change their email address" any time AOL decides they don't like it all of a sudden? (Not to mention that your solution applies to any email client in use). What you identified was a way to resolve the problem which does nothing to address the underlying "cause" which is AOL's system. Am fairly confident that most people would not consider having to change their email address because suddenly doesn't like it being a viable solution.


Which change exactly resulted in the resolution - changing the TO or the FROM (or did you use a completely different email domain for both from what getting rejected?)


When problems are presented that are not specifically Outlook related, people are pointed to other resources that may be more relevant. Your logic that simply because Outlook was used is tantamount to someone having computer hardware problems and since the computer uses electricity, the power company should be the first point of contact for answer(s) otherwise offense should be taken when directed a more appropriate resource for resolution.

Karl Timmermans [Outlook MVP]
"Outlook Contact Import/Export/Data Mgmt"
http://www.contactgenie.com
http://www.contactgenie.info

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