Did you find a resolve to this?.
I'm having the same problem.
Strange this is, I sync'd my Iphone 4 to the mac - which basically took all the info that was on my Iphone 3GS, and 99% of it was fine - however now i'm having this not being able to send mail issue. It was working fine on the 3GS - presumably with the same settings?
Hello Dave. I'm not far from you - I live in Fleet.
I think the difference between your situation and mine is that I'm using an email service from a cable provider (Virgin Media) whereas yours is from Google (Gmail). Virgin Media appear to have put restrictions on using their SMTP server via other means than their own network. Gmail's network is the internet, and no restrictions for accessing them via a 3rd party like a telco network.
I've actually fixed my problem by setting up a gmail account in order to use the gmail smtp server for outgoing mail!
However I've also posted the queries on the virgin media website and I'll post any responses here as well.
*Confirmation from Virgin Media: this is from their help forum*
+Re: NTLWorld Email / Iphone problems - was working and suddenly stopped!+
+on 29-08-2010 15:36+
+I'm afraid it is not possible to use smtp.ntlworld.com from anything other than a Virgin Media connection, as such we can only recommend that you speak to orange to see if you are able to use their SMTP servers from your mobile.+
+Help and Support Forum Team+
Message was edited by: cjexpat
All, thank you very much for this. I had suffered from this issue on my iPhone 3GS sporadically before recently upgrading to an iPhone 4S. That was fine until just over a week ago. I had. It been able to find any solution u til this thread.
I managed to resolve it immediately by adding the username & password into the SMTP server settings. All is working find now. So a big thank you.
IIf emails don't send boot settings, mail contacts etc, the account, the SMTP server, change socket to 587.
goto mail , send a message. It will fail. Go to settings repat steps change server port back to original setting then hit done. Email now WORKS"!
hee Hee. ******* apple! Got to love 'em -STOP ******* CHANGING THINGS!!!!!!