I recently updated to Mavericks and now all my e-mail accounts won't send

Question

I recently updated to Mavericks and now all my e-mail accounts won't send. They all receive ok but when I send I get a message "sender address rejected by server" and " Authentification required" The passwords are still intact

Answer 1

Check the Mail settings for your account, especially the SMTP (outgoing) address, type of authentication, and entry of the proper email username and password. You can do this when you select the account then under the outgoing mail server use the dropdown menu to select the Edit option. Select your outgoing configuration in the list. Check the settings below, then click on the Advanced tab and check those settings.
If all is OK, then I suggest your reinstall Mavericks:
Reinstall Lion, Mountain Lion, or Mavericks without erasing drive
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported then click on the Repair Permissions button. When the process is completed, then quit DU and return to the main menu.
Reinstall Lion, Mountain Lion, or Mavericks
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it isthree times faster than wireless.