At any time you can manually create a link to a specific set of listings.
This method for manually creating a link may be useful depending on the kind of message you are sending. Some messages that you can create such as with the advanced email editor don't have a way to embed such a link, but you can create the link yourself if you really need to include it.
Links to specific listings look like this:
https://sryser.feeltheire.com/?mlsids=4932434,4931965,4929971#rslt
The sryser.feeltheire.com part is my personal website.
We will need the formal version of this, which is https://sryser.feeltheire.com/.
You can see that after the 'com/' it's followed by a specific format :
?mlsids=XXXX,XXXX,XXXX
Where XXXX = a listing ID, and they are separated by commas.
The link ends in #rslt which tells your web browser to automatically scroll down the page to where the listing results are.