Just noticed that `imap2` doesn't have a port number assigned.[1]

I remember @yarikoptic suggested somewhere about creating a test case for these. Should be easy enough to use set comparisons with first column CSV version of the list.[2] However, need to be aware that this list will be more up to date than the one included in distributions…

[1]: http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=imap2
[2]: http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv