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The list in does not specify in which community each collection belongs to. So for collections named "Thesis" that exist in multiple departments (Communities) the user can't choose which is the correct one.

One solution to this problem is to change the way the list is built in
(package by adding a loop inside the loop that gets the names / handles for each collection in order to get the names of the parent communities

so the original loop:

for (Collection collection : collections) 
   	String name = collection.getMetadata("name");
   	if (name.length() > 50)
   		name = name.substring(0, 47) + "...";

can be changed to:

for (Collection collection : collections)
	String name = "";
	String temp = "";
	String temp2 = "";
	Community[] community = collection.getCommunities();	//get the names of the communities for this collection
	for (Community com : community)
		temp = com.getMetadata("name");
		if (temp.length() > 15)
			temp = temp.substring(0, 12) + "...";	//Trimming the name of the community
		name = temp +" / "+ name;			//Adding the strings of the community names
	temp2 = collection.getMetadata("name");
	if (temp2.length() > 18)
		temp2 = temp2.substring(0, 15) + "...";		//Trimming the name of the collection
	name = name + temp2;

The variables ("temp","temp2") can be changed, string variable "temp" can be used instead "temp2", and the substring methods can be removed if the names of the communities are not very big. Some steps in the loop can be skipped/merged together.
This change has been tested in 1.5.2

The same can be applied in Profile page ( / package with the addition of

import org.dspace.content.Community

In this way the users can choose the collection they want to subscribe to for mail alerts