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Sending email while traveling in Europe

When I have traveled in Europe in the past, I have been able to receive emails in my Cox email account on a Windows laptop and an iPhone, but neither of them can send replies or new email.  They sit in the outbox and never send.  I thought I had this solved years ago when the telephone support guy said to use " on channel 465 with SSL" but that has not worked lately.  I see old postings about some services having cox SMTP servers blacklisted, or something like that.  Does anyone see an obvious problem and know a solution?