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SMTP authentication fails after new XG 135 install

Just replaced our school router with a brand new XG 135 (on ver 18 firmware) and now users can’t authenticate to their email.

our copier can no longer authenticate to SMTP and users are getting certificate & login prompts in Outlook.

We only have a base subscription and no new rules/policies were added. Not sure if the default IMAP rules are breaking things.

Not sure what out of the box feature I need to disable. This is affecting Google mail and provider mail.



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  • No because we use Google workplace (aka g suite) and don’t have a local email server so I did not think we would need an allow outbound SMTP scan rule.

    It seems Sophos only provides how to articles for Microsoft users as there is zero mention of G Suite or other cloud email providers

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