avast public profile does not allow to sent mails with attachments

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Dear all

running windows 10 avast premier 2015 and office 2013
on a 64 bit machine
I don't know if this is the right place to ask but I noticed that whenever I'm connected to a public hotspot that I'm not able to sent mails with attachments is there a way to modify these settings?

thanks for your help in this matter

Paul

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Update

 also mails with inserted images are not sent
very strange on homenetwork everything works like a charm