5472 Views 4 Replies Latest reply: Oct 12, 2013 11:45 AM by Chibearbob
When mail being sent from iPhone, it will be used the outgoing email server you had setup for the account sending email.
If it works on wifi and not by carrier, it means most likely one of the following:
a: carrier blocking SMTP using any other mail server than the carrier's one
b: your outgoing email server not reachable from external network (an example: 192.168.x.x server, it is a local subnet server, will never be reached from outside)
You can ask your carrier what is the outgoing email server you have to use, and add it to the "other smtp servers" info of your email account. When sending email, iPhone will try servers listed there if main will fail on send.