The IRS uses the postmark date on your envelope, not when they receive it, to determine if your tax filing is on time. Keep the postmarked envelope as proof, especially for extensions and deadline-sensitive documents.
That way you have proof that you mailed it on time, because that's the date that the IRS will go based on. They'll go based on the actual stamped date that's on the envelope when you mail it. So if you say, if you fill it out one day and you take 3 days to take it to the post office, the date that the post office marks on it is your official filing date, not the date that the IRS receives it at their, at their own mailbox.
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