zulip/templates/zerver/emails/missed_message.subject.txt

{% if show_message_content %}
    {% if group_pm %} Group PMs with {{ huddle_display_name }}
    {% elif mention %} {{ sender_str }} mentioned you
    {% elif private_message %} PMs with {{ sender_str }}
    {% elif stream_email_notify %} #{{ stream_header }}
    {% endif %}
{% else %}
    New missed messages
{% endif %}
{% if realm_name_in_notifications %} in {{ realm_str }}
{% endif %}