Hi @Peter_1985 ,
Hopefully, this helps you.
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Hi,
Email server is frequently forbidden due to the issue below. How to avoid the issue?
Remote server replied: 550 5.7.1 Service unavailable, Client host [?.?.?.?] blocked using Spamhaus. To request removal from this list see https://www.spamhaus.org/query/ip/?.?.?.? AS(1440) [VE1EUR02FT019.eop-EUR02.prod.protection.outlook.com]