Question: Mail app SMTP servers listings
The point as in subject line seems to be buggy (Mail>Preferences>Accounts>"any account defined">Server Settings tab>Outgoing Mail Server group>Account drop-down list). If to select Edit SMTP Server List ... not all defined SMTP servers are listed. All are listed not until one looks at the Account drop-down list in SMTP settings of particular account or uses System Preferences > Internet Accounts.
Is this a known problem?