PDFs, bulk mail, and deliverability

Many senders have concerns about sending bulk email with PDF attachments. ESPs often advise customers against doing so and suggest alternate solutions like linking to a web portal that has the PDF file. This is all very sensible. But what happens if you must send an PDF attachment due to a regulatory or some other mandatory requirement - is the campaign guaranteed to fail? The answer is no. It is possible to send a PDF attachment as part of a bulk campaign and give it a very good chance of reaching inboxes. ...

July 19, 2026 · 2 min · Ken O'Driscoll