MDE issues many different types of approvals. Call us at the DHS Customer Call Center at 1-800-332-6347 and select the option for Maryland.Download Maryland Mortgage Pre-Approval Letter template, modify and send for signing using BoloForms Signature. Opening and Viewing Forms. Place the mouse cursor over the form name you would like to open. Application for Approval. A letter is coming from Social Security PO Box in Baltimore, MD and I'm starting to freak out. Has anyone else received a letter from there? File Petition to Probate the Estate. Determine if you have a small or regular estate, as the forms and timelines differ for each.