Reset SMTP capabilities around connection attempts - #106
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Clear the cached EHLO capability map before every connection attempt and again when a partial start fails. Reusing an SMTP object currently exposes capabilities from a previous server before a new EHLO, and a failed reconnect can leave partial state visible.
The isolated and cumulative sources pass 95 tests / 170 assertions on Ruby 4.0.6 and 3.2.11. External lifecycle models reproduce four baseline failures and pass after this change; Mail 2.9.1 local delivery also passes. No repository test files were changed.