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https://answers.microsoft.com/en-us/office/forum/office_2010-outlook/521-521-aol-will-not-accept-delivery-of-this/65387677-e3fd-4b9b-a223-5db0a9cb3649
Feb 11, 2014 · 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.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_windows8/521-521-aol-will-not-accept-delivery-of-this/65387677-e3fd-4b9b-a223-5db0a9cb3649
Feb 11, 2014 · Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
https://wordtothewise.com/2012/10/mail-problems-at-aol/
Oct 12, 2012 · Mail problems at AOL. October 12, ... 554 mtaig-mbe01.mx.aol.com ESMTP not accepting connections ... 521 5.2.1 : AOL will not accept delivery of this message./ We are email marketing firm and we do not send SPAM. I contacted customer care and submitted numerous forms – but no response and we are still facing the same daily. ...
https://www.experts-exchange.com/questions/27249325/554-5-2-1-554-AOL-will-not-accept-delivery-of-this-message.html
554 5.2.1 554 AOL will not accept delivery of this message There are alos some emails he is not receiving in this account either, but not sure if this is the same issue or not. Any suggestions?
https://www.smtp2go.com/blog/email-delivery-errors-mean/
521 5.2.1 : AOL will not accept delivery of this message.- ... 554 message/partial not supported/ 554 5.6.1 Messages of type message/partial are not supported- If you are sending from a printer or a scanner, it may be that the content exceeds the default scan size of 2MB. First of all, turn of or disable the “multipart” option on the copier ...
https://serversmtp.com/smtp-error/
Another syntax error, not in the command but in its parameters or arguments. In the majority of the times it’s due to an invalid email address, but it can also be associated with connection problems (and again, an issue concerning your antivirus settings). 502. The command is not implemented. The command has not been activated yet on your own ...
https://sendgrid.com/docs/for-developers/sending-email/smtp-errors-and-troubleshooting/
SMTP Response codes and troubleshooting tips. Response codes. Each SMTP call you make returns a response. 200 responses are usually success responses, and 400 responses are usually deferrals. SendGrid continues to retry resending 400 messages for up to 72 hours.500 responses are hard failures that are not retried by our servers. This table has possible response codes with example errors and a ...
https://www.inmotionhosting.com/support/email/mail-delivery-failed-returning-message-to-sender/
Oct 25, 2012 · So, you sent an email and it was returned or bounced back to you with a message like: Mail delivery failed: returning message to sender Errors like this are generally encountered when there is an issue on the recipient server, or the intended recipient does not exist on the remote server.Author: Jacob Nicholson
https://serverfault.com/questions/871580/emails-bouncing-from-verizon-net-aol-com-how-to-fix
Your DNS records have issues by not implimenting DMARC, DKIM, and SPF in today's standards of spam protection. If you don't have them you are not compliant by today's standards. Lastly you need to have your ISP configure reverse DNS to your IP addresses for your domain name. This is what caused AOL and Q.com from not getting messages.
https://postmaster.verizonmedia.com/
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