ContributionsMost RecentMost LikesSolutionsRe: cannot send email thru iphone I have found a workaround for my location (Oklahoma). My primary SMTP server is SMTP.cox.net. Secondary is SMTP.central.cox.net. I was getting the message that SMTP.east.cox.net wasn't trusted and could not send email from my iPhone 6S+. After much wrangling with AT&T, Cox and Apple, a comment was made that the Cox east SMTP server was having problems. SO, I changed my secondary serve to SMTP.west.cox.net & Wahla! I can now send email. I have told Apple this and I am currently on eternal hold to tell Cox ov this workaround. I hope this helps your situation. After holding for over 30 minutes, I gave up..HOPEFULLY Cox actually moderates this forum & will look into their smtp.east problem.