Email inbox replies now work for Google and Microsoft OAuth inboxes even
when the self-hosted instance does not have global SMTP configured. This
keeps agent replies working for email channels that already have valid
inbox-level delivery settings.
fixes: chatwoot/chatwoot#13118closes: chatwoot/chatwoot#13118
## Why
Self-hosted email inbox replies were blocked by a global SMTP guard in
the `email_reply` path. For OAuth-backed email inboxes, outbound
delivery is configured at the inbox level, so the mailer returned early
and the reply flow failed before sending.
## What this change does
- Allows the `email_reply` path to proceed when the inbox has SMTP
configured
- Allows the `email_reply` path to proceed when the inbox has Google or
Microsoft OAuth delivery configured
- Renames the touched mailer helper predicates to `?` methods for
clarity
## Validation
- Configure a Google email inbox on a self-hosted instance without
global `SMTP_ADDRESS`
- Reply from Chatwoot to an existing email conversation
- Confirm the reply is sent through the inbox OAuth SMTP configuration
- Run `bundle exec rspec
spec/mailers/conversation_reply_mailer_spec.rb:595`
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Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
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