250ok - 250ok offers a SaaS-based platform to monitor and measure the deliverability of email networks.
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
Intermedia Exchange Email - Email Anti-spam
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
LeadExec - Use ClickPoint Software solutions to manage leads, calls, contacts, tasks, and improve lead quality and quantity while automating your marketing and sales efforts.
DuoCircle - DuoCircle provides enterprise spam filtering and email management solutions.