Sophos firewall, SMTP Error 3332, Authentication type not supported

I've recently installed Sophos XG230 UTMs on two campuses. Now our Sharp copiers could no longer scan to email.

They SMTP through a gmail account.

I know the user email and password are correct but we get a Error [3332]:  Authentication type not supported.
 
When tested with 'no authentication' connection to SMTP server is fine.

Whilst testing I have allowed all outbound traffic.

Any help would be greatly appreciated.
matedwardsAsked:
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matedwardsAuthor Commented:
Sophos support soved the issue.

The XG230 was congifured as a Mail Transfer Agent (MTA) so was effectively acting as a mail server - like a proxy.

This interfered with authentication against the gmail server.

Switching to 'Legacy mode' allowed traffic to get to gmail uneffected, solving the problem.

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matedwardsAuthor Commented:
Sophos support solved the problem.
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