After breach of condition of any mortgage other than one of the first priority, the mortgagee or any person claiming under the mortgagee may proceed for the purpose of foreclosure by a civil action against all parties in interest, except for parties in interest having a superior priority to the foreclosing mortgagee, in either the Superior Court or the District Court in the division in which the mortgaged premises or any part of the mortgaged premises is located. Parties in interest having a superior priority may not be joined nor will their interests be affected by the proceedings, but the resulting sale under section 6323 is of the defendant's or mortgagor's equity of redemption only. The plaintiff shall notify the priority parties in interest of the action by sending a copy of the complaint to the parties in interest by certified mail.

The foreclosure must be commenced in accordance with the Maine Rules of Civil Procedure, and the mortgagee shall also record a copy of the complaint or a clerk's certificate of the filing of the complaint in each registry of deeds in which the mortgage deed is or by law ought to be recorded and such a recording thereafter constitutes record notice of commencement of foreclosure. The complaint must allege with specificity the plaintiff's claim by mortgage on such real estate, describe the mortgaged premises intelligibly, state the existence of public utility easements, if any, that were recorded subsequent to the mortgage and prior to the commencement of the foreclosure proceeding and without mortgagee consent, state the amount due on the mortgage, state the condition broken and by reason of such breach demand a foreclosure and sale. Service of process on all parties in interest and all proceedings must be in accordance with the Maine Rules of Civil Procedure. "Parties in interest" includes mortgagors, holders of fee interest, mortgagees, lessees pursuant to recorded leases or memoranda thereof, lienors and attaching creditors all as reflected by the indices in the registry of deeds and the documents referred to therein affecting the mortgaged premises, through the time of the recording of the complaint or the clerk's certificate. Failure to join any party in interest does not invalidate the action nor any subsequent proceedings as to those joined. Failure of the mortgagee to join, as a party in interest, the holder of any public utility easement recorded subsequent to the mortgage and prior to commencement of foreclosure proceedings is deemed consent by the mortgagee to that easement. Any other party having a claim to the real estate whose claim is not recorded in the registry of deeds as of the time of recording of the copy of the complaint or the clerk's certificate need not be joined in the foreclosure action, and any such party has no claim against the real estate after completion of the foreclosure sale, except that any such party may move to intervene in the action for the purpose of being added as a party in interest at any time prior to the entry of judgment.

For purposes of this section, "public utility easements" means any easements held by public utilities, as defined in Title 35-A, section 102; sewer districts, as defined in Title 38, section 1251; or sanitary districts, as formed under Title 38, chapter 11.

The acceptance, before the expiration of the right of redemption and after the commencement of foreclosure proceedings of any mortgage of real property, of anything of value to be applied on or to the mortgage indebtedness by the mortgagee or any person holding under the mortgagee constitutes a waiver of the foreclosure unless an agreement to the contrary in writing is signed by the person from whom the payment is accepted or unless the bank returns the payment to the mortgagor within 10 days of receipt. The receipt of income from the mortgaged premises by the mortgagee or the mortgagee's assigns while in possession of the premises does not constitute a waiver of the foreclosure proceedings of the mortgage on the premises.

The mortgagee and the mortgagor may enter into an agreement to allow the mortgagor to bring the mortgage payments up to date with the foreclosure process being stayed as long as the mortgagor makes payments according to the agreement. If the mortgagor does not make payments according to the agreement, the mortgagee may, after notice to the mortgagor, resume the foreclosure process at the point at which it was stayed.