Method of and system for constructing a listing of e-mail messages

There is provided a method of constructing a listing of e-mail messages, the method comprising: retrieving, by at least one server, information in respect of a plurality of e-mail messages from at least one database in electronic communication with the at least one server, each e-mail message including a header having a plurality of header fields and a body having content; sending, by the at least one server to a client device via a communications network, instruction to display in one of an e-mail message listing pane or an e-mail message listing window in a graphical user interface of the client device, a listing of e-mails, the listing including in respect of at least some of the e-mail messages listing information including at least some of the header fields; for a first one of the e-mail messages, one of determining a classification of the first one of the e-mail messages by the at least one server and retrieving from the database a classification of the first one of the e-mail messages by the at least one server, the classification including a sender type and at least one message type; sending, by the at least one server to the client device via the communications network, instruction to display in the listing information in respect of the first one of the e-mail messages appearing in the listing of e-mail messages a first user-selectable graphical element for causing a first function to be performed in respect of the first one of the e-mail messages, the first function being based, at least in part, on the classification of the first one of the e-mail messages.