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3SL would like to advise everyone who sends us e-mails that, to help our spam filters, our e-mail system rejects e-mails containing embedded PNG, GIF or JPEG images.
Some customer e-mails may be caught by this filter, the most common cause is the use of company logos in e-mail signatures.
We have tried to avoid the problem for customers by adding your companies to our email server’s whitelist, but we would be grateful if, nonetheless, you could ensure that your e-mails will not be caught by this simple image filter.