Cannot find mail connection doctor

I'm having a problem sending of e-mail messages and the online world has lots of messages saying this is probably due to a problem with the upgrade of the El Capitan. In order to solve the problem, I need to use mail connection doctor utility, but I can't find anywhere on my computer. I have Mac OS X - El Capitan version 10.11.6. (I have a 2008 iMac computer. It's a single user NOT networked desktop computer and I'm the only user. It has automatic updates selected.)  Is it possible that the central database has not been downloaded during the last version of the operating system has been added to my computer? Is there anywhere I can go to add to my computer? HOW can I access the central database utility? Help please

Use Mail connection doctor - Apple Support

Tags: Mac OS & System Software

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