How to send pdf securely via email is the question a small firm asks when a client wants a document now and the firm knows an attachment is the wrong answer. This page says what an encrypted email attachment and secure email attachments actually protect, which is the message in transit and nothing after it lands, and gives the answer that keeps the firm's record: send the email, and put a portal link in it instead of the file. The free document capture worksheet on this site sizes the backlog; Batesio Pro keeps the logged link for $19 a month for the whole firm.
What an encrypted email attachment protects
Encryption in transit protects the message between the firm's mail server and the client's. Once the attachment lands it is a file in an inbox the firm does not control, forwarded as easily as any other, with no record of who opened it. Secure email attachments with a password add a password that travels in the next email. The NIST framework cited below has the vocabulary for asking a vendor what happens after delivery; the honest answer for an attachment is nothing.
Send the email, replace the attachment with a link
The email still goes, with the same words in it, and where the PDF was there is a portal link tied to the client's email address that expires on a date the firm set. The client clicks, sees one page with the numbered document, downloads it, and the open and the download are logged. If the email is forwarded, the link does not open for the person it was forwarded to. That is how to send a PDF securely via email from a firm that has to keep a record of it.
The client's side stays simple, and the price
No account, no app, one page, the Bates number visible on the document; a client who is not technical uses it without a phone call, which is the only test that matters. Dropbox publishes its Standard team plan at $15 per user per month as the storage rate. Batesio Pro is $19 a month for the whole firm and keeps the logged, expiring link, the client's upload page, the numbering and the retention record, with an export.
Questions people ask about how to send pdf securely via email
Is an encrypted email attachment secure enough for a tax return?
It protects the message in transit only. A portal link logs the client's open and can be withdrawn.
How do I send a PDF securely via email without a portal?
A password-protected PDF with the password sent separately is the best an attachment can do, and it still leaves no record of who opened it.
Will clients accept a link instead of an attachment?
Yes, if it opens in one click with no account; a note in the engagement letter that documents arrive by link helps.
Does the link expire?
Yes, on the date the firm set, and it can be withdrawn earlier; the log records every open before that.