ietf-mta-filters
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Re: Recommended ManageSieve TCP port 2000 is already allocated to Cisco SCCP

2009-01-13 03:39:37

Pushing SCCCP out of the way isn't going to work very well... I suggest getting a new port (x) and using these rules:

Clients MUST try port x first. If a client gets connection refused on the right port number, it MAY try 2000, but in that case it should watch out for SCCCP. Sieve banners look like <example>, and always contain a line starting with "SIEVE " and one starting with "IMPLEMENTATION ". SCCCP banners look like <example>, and always <dan?>.

Servers MUST listen to port x, and MAY also listen to 2000 to cater to old clients.

Client and server implementers using port 2000 should note that some/many old servers and clients have a bug wrt. literals. Sending correct literals may cause the peer to detect a "syntax error", and so does sending incorrect literals.

Arnt