I have found that Avast Free on my PC is letting emails containing a virus/spam through although Avast mobile is not
You can report a suspicious/malicious sample (File/Website) here: https://www.avast.com/report-malicious-file.php
Can you give more details.
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What is your email client, is it webmail or email program (thunderbird, etc.) ?
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How do you know this, e.g. what did detect it ?
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What was detected ?
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If you are using a regular PC based email client and the regular Mail Shield, then I see nothing in the shield setting about Spam Detection.
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If your email program is MS Outlook, that does have an anti-spam function, but you must be using the avast plugin for MS Outlook.
Hopefully you can see we need more information.