The best way to know if the emails being used are valid emails is by adding an email validation service that can return a valid response through MX records.
Dedication and passion goes to those who are able to push and merge a project.
Regards,
Straightlight
Programmer / Opencart Tester
A "bounce" means that the email from the mailing list can not be sent to your email server.
If your email provider "returns" too many messages (ie, tells Mailman that the message could not be delivered), Mailman finally stops trying to send you mail. This feature allows Mailman to gracefully manage addresses that no longer exist (for example, the subscriber has found a new ISP and forgot to unsubscribe from the previous address), as well as addresses temporarily out of service. the subscriber has used all the space allocated to his email account or the subscriber's email provider is having difficulties).
We use the mailing list server of Radboud University and we can not verify in the records why your mail server is sending mail from the list. Your server may not be available, your email address may no longer exist, or your inbox may be full.
If your email provider "returns" too many messages (ie, tells Mailman that the message could not be delivered), Mailman finally stops trying to send you mail. This feature allows Mailman to gracefully manage addresses that no longer exist (for example, the subscriber has found a new ISP and forgot to unsubscribe from the previous address), as well as addresses temporarily out of service. the subscriber has used all the space allocated to his email account or the subscriber's email provider is having difficulties).
We use the mailing list server of Radboud University and we can not verify in the records why your mail server is sending mail from the list. Your server may not be available, your email address may no longer exist, or your inbox may be full.
Correct. The mailbox full analysis is a good point.bkdroid13 wrote: ↑Tue Jun 04, 2019 4:40 pmA "bounce" means that the email from the mailing list can not be sent to your email server.
If your email provider "returns" too many messages (ie, tells Mailman that the message could not be delivered), Mailman finally stops trying to send you mail. This feature allows Mailman to gracefully manage addresses that no longer exist (for example, the subscriber has found a new ISP and forgot to unsubscribe from the previous address), as well as addresses temporarily out of service. the subscriber has used all the space allocated to his email account or the subscriber's email provider is having difficulties).
We use the mailing list server of Radboud University and we can not verify in the records why your mail server is sending mail from the list. Your server may not be available, your email address may no longer exist, or your inbox may be full.
Dedication and passion goes to those who are able to push and merge a project.
Regards,
Straightlight
Programmer / Opencart Tester
The Email Address from the my friends site that I'm Helping with, Isn't bouncing any Emails, and Isn't close to being Full. Somebody that uses WildBlue.net had WildBlue.net Block the Auto Order Confirm Email,because WildBlue.net Called it a Spam Email.
Then my first reply would be the right solution; to use an MX record provider to track down the activities. You can also debug the emails on your own from your end noticing if the issue is with the outgoing emails. If not, then it's with the incoming emails and before reaching the destination, it bounces back for one-to-multiple reasons.
Dedication and passion goes to those who are able to push and merge a project.
Regards,
Straightlight
Programmer / Opencart Tester
I Just Copied / Pasted, and Emailed from a Totally Different Server the Conference Registration Auto Reply to a Embarq Email User, and that Was Also Blocked. Then I Emailed the Embarq Email User from the Other Mail Server Without the Open Cart Auto Reply Info, and That Wasn't Blocked. 
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