Email messages not delivered to club members 31-03-22

This morning I tried to use our group membership email to send important correspondence to our members. All emails are returning to me  

What should I do? Is the error at our end? It appears to be affecting any email address that does not have a gmail extension.

Jane Buckley
Secretary
Robina Toastmasters Club No 584

I had the same thing happen this evening when I sent out emails to our club.  How do I fix this?
Ruth 
VPE
Triad Toastmasters

All emails from FTH (server@toastmastersclubs.org ) to my club members are being rejected with this message:

 (reason: 550 5.7.1 Service unavailable, Client host [50.19.253.65] blocked using Spamhaus. To request removal....spamhaus.org/query/ip/50.19.253.65 (AS3130). [SN1NAM02FT0041.eop-nam02.prod.protection.outlook.com])

Is there anything that I can do?
 

We're having the same error (Club 0422):From: FreeToastHost Server <This email address is being protected from spambots. You need JavaScript enabled to view it.>
Date: Thu, 31 Mar 2022 at 10:24
Subject: [FreeToastHost] Message Not Delivered: Action Required: Austin Nevis Pending Addition to Adelaide
To: <This email address is being protected from spambots. You need JavaScript enabled to view it.>

Your email message to This email address is being protected from spambots. You need JavaScript enabled to view it. could not be delivered
and was returned to the FreeToastHost server. Details are as follows:

        Recipient Email Address: This email address is being protected from spambots. You need JavaScript enabled to view it.
        Email Subject: Action Required: Austin Nevis Pending Addition to Adelaide
        Date Sent: Wed, 30 Mar 2022 23:54:16 +0000

        Diagnostic Code: 550 5.7.1 Service unavailable, Client host [50.19.253.65] blocked using Spamhaus. To request removal from this list see www.spamhaus.org/query/ip/50.19.253.65 (AS3130). url=https://mailtrack.io/trace/link/772c1141b9ed7e4c598b281f98e78b61f1fb8d1b?url=http%3A%2F%2FDB5EUR01FT056.eop-EUR01.prod.protection.outlook.com&userId=4291652&signature=85d20d3f757f60d3]DB5EUR01FT056.eop-EUR01.prod.protection.outlook.com[/url
        Delivery Status: 5.7.1 securityerror
        Date Last Attempted: Wed, 30 Mar 2022 23:54:17 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 .

Note that I have tried sending to myself (@internode.on.net); no result after 1 hour so far....
(I note this good support article referring to safe senders for Outlook:
support.toastmastersclubs.org/doc/item/e...embers-receive-email
But if my address fails then it's a wider issue I would think).
 

FTH was spammed by hundreds of IP addresses around the world and some of your email host do not look at the originating source of spam and blame FTH for forwarding the spam.

It will take us a few days to block all of the new spammers using Microsoft servers and stop this new wave of spam.