This started happening yesterday, and I didn't think anything of it until I tried to follow steps to fix the issue -- nothing I send from either of my Yahoo! accounts using the default mail app is working. They'll still receive mail but for whatever reason, the SMTP server is "unavailable" all of a sudden. Anyone else having this issue? Know of a fix? I've tried deleting the Yahoo account and re-adding it, but it won't connect to the server *at all* and I don't get any options to change it during set-up. ETA: it's strictly off my phone. I double checked with my iPad and have no issues sending via my iPad. I've deleted account, but can't re-add, and I've restarted my phone to no avail.