problem with email after upgrading to 11.3.1

Hi Pavka,

Thank you for your question. We're happy to help. Let's start with our article here: If you can't send or receive email on your Mac

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Certain emails. Particularly suspicious ones will not delete

one suggestion I have seen is to reinstall mail but there is a warning that you loose all sorts of information if you do I don’t want to go down that route. From what I can gather thus problem, has been around for eight Years and Apple have not even acknowledged that it exists. This applies to an iPhone 7 with the latest updates