Kai Schaetzl wrote: > Miark wrote on Fri, 18 Jan 2008 17:55:32 -0500: > > >> The winning solution >> > > Nevertheless, Bowie's solution is the correct one. > Indeed, 587 is the standard port for mail submission. http://www.ietf.org/rfc/rfc2476.txt http://www.ietf.org/rfc/rfc5068.txt and since "submission" is found in /etc/services (at least on recent systems), one can use it in firewall rules... It is also hoped that future versions of MUAs will be submission-friendly (propose this port and check whether STARTTLS and/or SASL AUTH is needed, ... etc). In addition, the service is already defined in master.cf. one just needs to uncomment it.