Attachment and link security covers scanning files and URLs in inbound mail (sandboxing, detonation, URL rewriting and time-of-click checks) and safe handling policies for outbound content.
Are PDF attachments safe?
Mostly, but PDFs can carry scripts and phishing links. Sandboxing and link rewriting still apply.
Why does email attachment and link security matter for deliverability?
Malicious attachments and links remain the main payload delivery method for ransomware and credential theft.
What is the first step to get started with email attachment and link security?
Block executable and macro-enabled attachment types at the gateway.
What is the most common email attachment and link security mistake?
Allow-listing partner domains and bypassing scanning entirely.