Problems sending Outlook emails to Hotmail Users

G

GTC66

Hi There,

Can you help please. I've just started experiencing a problem when sending emails from Outlook 365 to Hotmail.com users ? This is the message received "

example xxx.hotmail.comhost hotmail-com.olc.protection.outlook.com [104.47.1.33]

SMTP error from remote mail server after pipelined MAIL FROM: xxx@emample.com SIZE=42929:

550 5.7.1 Unfortunately, messages from [94.126.40.95] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider . [VE1EUR01FT054.eop-EUR01.prod.protection.outlook.com]

Many thanks

Gary

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