"Sender Name is Invalid" (can't send email from POP account) iPhone 2.1

Question

I updated from V2.0.2 to V2.1 today. I also swapped out my original iPhone EDGE for a new iPhone EDGE due to unrelated problems with the speaker.
Upon testing things after restoring from backup to the new phone I discovered that I could no longer SEND email from my POP account. I could receive email just fine on that account. Sending and receiving email on my MobilMe account also worked, as did sending and receiving email via the POP account while on the Mac computer I use to sync with this iPhone.
After digging into this with AppleCare we discovered that somehow the Port Address for the Outgoing Mail Server for that POP account had been changed from 25 to 587 on the iPhone.
Changing it back to 25 fixed my problem.
We don't know whether the problem was due to the 2.1 upgrade or due to something in the restore process after swapping the phones.
If you get the error message "Sender Name is Invalid" while trying to send email from a POP account on your iPhone, go to Settings > Mail, Contacts, Calendars and select the line for your POP account.
Now scroll down to the Outgoing Mail Server entry which should show "SMTP" and the name of the outgoing mail server for that POP account. Select that line. This will display a list of servers with your POP account server showing at the top as the Primary Server. Select that line.
In the panel that displays, check the Server Port. If it is something odd like 587, that may be your problem. Select the line and you can edit it to something more normal like 25. Touch the "SMTP" button at the top left of the number entry screen to accept that new value.
We discovered that after correcting that value on the iPhone it STAYS corrected even after doing a new Sync with iTunes, or after MobileMe syncs.
--Bob

Answer 1

Sorry you had problems Bob.
Depending on the mail service you are using, Port 25 or Port 587 are usually acceptable for outgoing
SMTP mail. Many cafes will block the customary port 25 to prevent spammers from using their
wireless access.
There is a superb tutorial posted here:
http://www.webmail.us/docs/support/Macintosh-OSX-Mail.pdf
Also be sure for each mail account to turn ON the secondary AT&T server shown at the bottom
of the SMTP server list for each account -- it will make your transition from wireless to Edge
to 3G networks much more reliable.
Thanks for sharing what you've learned. Hope this helps.