Is anybody else having issues with yahoo small business mail where they can receive emails but when sending get a pop up saying Cannot sent mail The senders address was invalid I have tried everything that I can think of, it driving me crazy. I tried deleting the account and re-entering the info, Ive tried changing the ports, turning off SLL, and a password reset and still it doesnt work. I have spoken with yahoo and they assure me my account settings are correct, and are blaming apple. They said the fact that my imac is working fine with the same settings proves it the fault of the iphone. Can anybody please help, im tearing my hair out.