After an iSO7 upgrade I cannot send e-mails all settings are correct what can I do?

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After an iSO7 upgrade I cannot send e-mails I can receive them, all my settings for incoming?outgoing servers are correct what must I do
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Well that depends on what is meant by "cannot send e-mails".
What happens when trying to send emails?  Any errors?
Does this happen on Wi-Fi, cellular, both?