Just file a separate document called "proof of service" and you should be fine. For future reference, you can use ordinary mail for service of things other than a complaint. Things you are sending the other attorney do not generally need to be sent certified.
Be very careful here. More often than not, pro se litigants self-inflict damage by simply not knowing what they do not know. In your case you are confusing the filing rules with the rulues of evidence, potentially very much to your detriment. The rules of evidence govern admissibility. As a general rule, filing a document with the court does not make it admissible.
Nothing short of the focused advice of an experienced litigator in your area will meet your needs.
Best wishes for a favorable outcome, and please remember to designate a best answer.
This answer is offered as a public service for general information only and may not be relied upon as legal advice.
You can re-file the document with a proof of service. Also, just because you have filed a document with the court does not make it admissible in court. Whether a document is admissible depends on the rules of evidence and whether the rules apply to the particular type of court proceeding you are involved in.
Tara Moody-Nichol is licensed only in the State of Michigan. All answers provided relate only to Michigan law and are made for general information purposes ONLY. They are NOT intended to be legal advice and are NOT intended to create an attorney-client relationship between Ms. Moody-Nichol and any readers or subscribers to avvo.com. Tara Moody-Nichol Attorney at Moody & Nichol, PLLC East Lansing, MI (517) 583-0520