fix: simplify asciinema SMTP configuration

Removed unnecessary SMTP settings that were causing issues:
- URL_PORT (not needed)
- SMTP_AUTH (default behavior)
- SMTP_RETRIES (default behavior)
- SMTP_NO_MX_LOOKUPS (causing connection issues)
- MAIL_REPLY_TO_ADDRESS (not essential)
- UNCLAIMED_RECORDING_TTL (not essential)

Using minimal working SMTP configuration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

asciinema/compose.yaml

@@ -11,7 +11,6 @@ services:
     environment:
       SECRET_KEY_BASE: ${ASCIINEMA_SECRET_KEY}
       URL_HOST: ${ASCIINEMA_TRAEFIK_HOST}
-      URL_PORT: 443
       URL_SCHEME: https
       DATABASE_URL: postgresql://${DB_USER}:${DB_PASSWORD}@${CORE_DB_HOST}/${ASCIINEMA_DB_NAME}?pool_size=10
       SMTP_HOST: ${EMAIL_SMTP_HOST}
@@ -19,13 +18,8 @@ services:
       SMTP_USERNAME: ${EMAIL_SMTP_USER}
       SMTP_PASSWORD: ${EMAIL_SMTP_PASSWORD}
       SMTP_SSL: true
-      SMTP_AUTH: always
-      SMTP_RETRIES: 1
-      SMTP_NO_MX_LOOKUPS: false
       MAIL_FROM_ADDRESS: ${EMAIL_FROM}
-      MAIL_REPLY_TO_ADDRESS: ${ASCIINEMA_MAIL_REPLY_TO}
       SIGN_UP_DISABLED: ${ASCIINEMA_SIGN_UP_DISABLED:-false}
-      UNCLAIMED_RECORDING_TTL: ${ASCIINEMA_UNCLAIMED_TTL:-30}
     labels:
       - 'traefik.enable=${ASCIINEMA_TRAEFIK_ENABLED}'
       # HTTP to HTTPS redirect