Rewrite the recipient.
Change name@example.org to name#example.org@smtp250.org. Write your real message, including attachments, to one recipient.
For freelancers & small agenciesImportant email.
Important email.
Acceptance
recorded.
Sending a proposal or project deliverable? SMTP250 forwards your email and records when the recipient’s mail server accepted it, in a digitally signed PDF.
No accountNo subscriptionYour usual email app
Server acceptance is not proof of reading or guaranteed inbox placement.
Your usual email app is enough.
Confirm the payment link.
SMTP250 replies to your sending address. Reserve €1 by card using the link. Forwarding then starts. Leave DEMO out of the subject for real forwarding.
Receive the acceptance record.
After confirmed acceptance, receive one signed PDF with the complete signed JSON dataset printed on it. Temporary delivery errors are retried within the delivery window.
Try the format before paying.
The free DEMO returns a sample PDF to your sending address. Your original message is not forwarded and no money is reserved.
Prepare my free DEMO →What the PDF records
Technical evidence
Sender and destination, subject, timestamps, a SHA-256 fingerprint of the message received by SMTP250 and the observed recipient server response. The PDF includes its own document signature and the signed JSON data.
View a synthetic sample (German) →Clear limits
This is an operator-signed technical record. It does not prove reading, inbox placement or guaranteed legal effect. It is not a qualified signature and has no independent trusted timestamp. Original email content and attachments are not printed in the PDF.
Messages are temporarily stored for payment reservation and retries. Application content is encrypted. The legal terms, certificate and service emails are currently primarily in German. Company details, privacy and terms (German).
Questions or feedback: info@smtp250.org.