System Warning Email Bounceback

This isn't exactly a new topic.  I have searched posts of others with what appears to be the same or similar issues.  I haven't seen a solution so I'm posting this.  One of our member's messages keep bouncing back when sending messages to members-2849@toastmastersclubs.org.  This hasn't always happened.  It has been happening for me for a while and then started happening to our VPED last week.  This is a valid email address that I use to email her in Outlook ying xu .  Thanks for your assistance.
Bev Ward, Wild Oats Toastmasters #2849  wildoats.toastmastersclubs.org/

This is the message:[Mon, 11 Aug 2025 14:28:21 UTC, FreeToastHost System Warning]  Emails sent to the email address [ ying302002@yahoo.ca ] have bounced too many times and exceeded the FreeToastHost limit for returned emails.  The error information for the last bounced email is as follows: Your email message to ying302002@yahoo.ca could not be deliveredand was returned to the FreeToastHost server. Details are as follows:             Recipient Email Address: ying302002@yahoo.ca            Email Subject: Wild Oats Toastmasters Club 2025-08-11 Meeting Notification: Role            Date Sent: Mon, 11 Aug 2025 14:28:16 +0000             Diagnostic Code: 554 5.7.9 Message not accepted for policy reasons. See senders.yahooinc.com/error-codes             Delivery Status: 5.0.0             Date Last Attempted: Mon, 11 Aug 2025 14:28:18 GMT NOTE: This email address may be invalid or non-working and should be changed, deleted, or updated to allow delivery.            Refer to the following user documentation for other ways that your recipient may be able to use to remedy this problem:                          support.toastmastersclubs.org/doc/item/e...embers-receive-email  If you have any questions about this, please visit us at support.toastmastersclubs.org .  This automatically generated message is to notify you that this email address ***has been removed*** from the FreeToastHost database to prevent it from causing further bounces.  Places where this email address was cleared are as follows: Secondary Email Address for Member Ying Xu Repeatedly attempting to send emails to invalid, non-working email addresses hurts the overall email reputation of the FreeToastHost system and will not be tolerated. Please ensure that valid, functioning email addresses are in use to prevent further actions of this nature in the future. Refer to the following user documentation in the future to ensure that your recipients can receive your emails:https://support.toastmastersclubs.org/doc/item/ensuring-that-members-receive-email If you have any questions about this warning, please visit support.toastmastersclubs.org  

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[Mon, 11 Aug 2025 02:36:45 UTC, FreeToastHost System Warning] Emails sent to the email address [ ying302002@yahoo.ca ] have bounced too many times and exceeded the FreeToastHost limit for returned emails.  The error information for the last bounced email is as follows: Your email message to ying302002@yahoo.ca could not be deliveredand was returned to the FreeToastHost server. Details are as follows:             Recipient Email Address: ying302002@yahoo.ca            Email Subject: Wild Oats Toastmasters Club 2025-08-11 Meeting Notification: Role            Date Sent: Mon, 11 Aug 2025 02:36:39 +0000             Diagnostic Code: 554 5.7.9 Message not accepted for policy reasons. See senders.yahooinc.com/error-codes             Delivery Status: 5.0.0             Date Last Attempted: Mon, 11 Aug 2025 02:36:42 GMT NOTE: This email address may be invalid or non-working and should be changed, deleted, or updated to allow delivery.            Refer to the following user documentation for other ways that your recipient may be able to use to remedy this problem:                          support.toastmastersclubs.org/doc/item/e...embers-receive-email  If you have any questions about this, please visit us at support.toastmastersclubs.org .  This automatically generated message is to notify you that this email address ***has been removed*** from the FreeToastHost database to prevent it from causing further bounces.  Places where this email address was cleared are as follows: Secondary Email Address for Member Ying Xu Repeatedly attempting to send emails to invalid, non-working email addresses hurts the overall email reputation of the FreeToastHost system and will not be tolerated. Please ensure that valid, functioning email addresses are in use to prevent further actions of this nature in the future. Refer to the following user documentation in the future to ensure that your recipients can receive your emails:https://support.toastmastersclubs.org/doc/item/ensuring-that-members-receive-email If you have any questions about this warning, please visit support.toastmastersclubs.org

The Bounce Count for Email Address [ying302002@yahoo.ca] has been reset to zero. Their email should now workAug 21 12:37:42 toastmastersclubs sendmail[10381]: 57LCbfHU010377: to=<ying302002@yahoo.ca>, ctladdr= (501/502), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=120970, relay=mta7.am0.yahoodns.net. [98.136.96.76], dsn=2.0.0, stat=Sent (ok dirdel)

Thanks!