For about 2 months now I can send email only over wi-fi but not over 3/4G network. I am using a Samsung S9 with Samsung email app. I am with provider 3. If I try to send email, where there is no Wi-fi, the message goes into the Outbox and eventually goes to draft. Gmail works fine in all cases. I've tried reinstalling as both IMAP and POP3 to no effect. I've tried other email apps with same effect. Receives messages OK in all cases.