92a9864517
Adds EMAIL_IMAP_SECURITY / EMAIL_SMTP_SECURITY and EMAIL_IMAP_TLS_VERIFY / EMAIL_SMTP_TLS_VERIFY (env or platforms.email.extra.*) so the adapter can talk to local relays such as Proton Mail Bridge (IMAP 1143 / SMTP 1025 with STARTTLS and a self-signed certificate) instead of hardcoding IMAP4_SSL and SMTP+STARTTLS with a verified default context. Salvaged from #99641 (adapter.py only).