A method for producing a continuous web of printed material for use in creating mailpieces, the continuous web having a width and a length, the length comprised of a series of attached sheets, the series of attached sheets comprising envelope sheets and content pages, the envelope sheets and content pages being processed by a mail creation machine to form mailpieces, the mail creation machine having different mechanisms for processing envelope sheets and content sheets, the method comprising: printing content pages onto the continuous web in continuous groups of one or more content pages that correspond to pages for a given mailpiece; printing envelope sheets in series with the content pages, at least one of the envelope sheets corresponding to the given mailpiece; the method being characterised in that it comprises determining a processing time in the mail creation machine for a content page group for the given mailpiece; determining a processing time in the mail creation machine for the at least one envelope sheet for the given mailpiece; wherein the steps of printing the content pages and printing the envelope sheets include a further step of separating the content page group and the envelope sheet for the given mailpiece, along a direction of the length of the web, so as to reduce a delay between completion of the content page group and of the envelope sheet in the machine, an amount of separation being a function of the determined processing times of the content page group and the envelope sheet. printing content pages onto the continuous web in continuous groups of one or more content pages that correspond to pages for a given mailpiece; printing envelope sheets in series with the content pages, at least one of the envelope sheets corresponding to the given mailpiece; the method being characterised in that it comprises determining a processing time in the mail creation machine for a content page group for the given mailpiece; determining a processing time in the mail creation machine for the at least one envelope sheet for the given mailpiece; wherein the steps of printing the content pages and printing the envelope sheets include a further step of separating the content page group and the envelope sheet for the given mailpiece, along a direction of the length of the web, so as to reduce a delay between completion of the content page group and of the envelope sheet in the machine, an amount of separation being a function of the determined processing times of the content page group and the envelope sheet. determining a processing time in the mail creation machine for a content page group for the given mailpiece; determining a processing time in the mail creation machine for the at least one envelope sheet for the given mailpiece; wherein the steps of printing the content pages and printing the envelope sheets include a further step of separating the content page group and the envelope sheet for the given mailpiece, along a direction of the length of the web, so as to reduce a delay between completion of the content page group and of the envelope sheet in the machine, an amount of separation being a function of the determined processing times of the content page group and the envelope sheet.