diff --git a/app/models/post.rb b/app/models/post.rb
index a1174b078..3a1b372af 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -10,6 +10,32 @@ class Post < ActiveRecord::Base
   # also has_many notifications, but kinda meaningless to get at them
   # from this direction, so we won't set up an association for now.
 
+  after_create do
+    recipients = Array.new
+    sender    = self.author.id
+    self.body.scan(Haml::Filters::GrowstuffMarkdown::MEMBER_REGEX) do |m|
+      # find member case-insensitively and add to list of recipients
+      member = Member.where('lower(login_name) = ?', $1.downcase).first
+      recipients << member if member and not recipients.include?(member)
+    end
+    self.body.scan(Haml::Filters::GrowstuffMarkdown::MEMBER_AT_REGEX) do |m|
+      # find member case-insensitively and add to list of recipients
+      member = Member.where('lower(login_name) = ?', $1[1..-1].downcase).first
+      recipients << member if member and not recipients.include?(member)
+    end
+    # don't send notifications to yourself
+    recipients.map{ |r| r.id }.each do |recipient|
+      if recipient != sender
+        Notification.create(
+          :recipient_id => recipient,
+          :sender_id => sender,
+          :subject => "#{self.author} mentioned you in their post #{self.subject}",
+          :body => self.body,
+        )
+      end
+    end
+  end
+
   default_scope { order("created_at desc") }
 
   validates :subject,
diff --git a/spec/models/post_spec.rb b/spec/models/post_spec.rb
index c56a5b301..61eb24bc1 100644
--- a/spec/models/post_spec.rb
+++ b/spec/models/post_spec.rb
@@ -96,6 +96,38 @@ describe Post do
     end
   end
 
+  context "notifications" do
+    let(:member2) { FactoryGirl.create(:member) }
+
+    it "sends a notification when a member is mentioned" do
+      expect {
+        FactoryGirl.create(:post, :author => member, :body => "Hey @" << member2.login_name)
+      }.to change(Notification, :count).by(1)
+    end
+
+    it "sets the notification field" do
+      @p = FactoryGirl.create(:post, :author => member, :body => "Hey @" << member2.login_name)
+      @n = Notification.first
+      @n.sender.should eq member
+      @n.recipient.should eq member2
+      @n.subject.should match /mentioned you in their post/
+      @n.body.should eq @p.body
+    end
+
+    it "sends notifications to all members mentioned" do
+      @member3 = FactoryGirl.create(:member)
+      expect {
+        FactoryGirl.create(:post, :author => member, :body => "Hey @" << member2.login_name << " & @" << @member3.login_name)
+      }.to change(Notification, :count).by(2)
+    end
+
+    it "doesn't send notifications if you mention yourself" do
+      expect {
+        FactoryGirl.create(:post, :author => member, :body => "@" << member.login_name)
+      }.to change(Notification, :count).by(0)
+    end
+  end
+
   context "crop-post association" do
     let!(:tomato) { FactoryGirl.create(:tomato) }
     let!(:maize) { FactoryGirl.create(:maize) }